Buhler
Versatile
2145
2160
2180
2210
Section 5
Rear Axle
89007005 8/05
SECTION 5 - REAR AXLE (Rear Axle Assembly)
SECTION 5
REAR AXLE
CHAPTER 1
REAR AXLE ASSEMBLY
CONTENTS
DESCRIPTION OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-2
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-13
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-22
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-23
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-30
DISASSEMBLY AND REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-51
5-1-1
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DESCRIPTION OF OPERATION
INTRODUCTION
Two style rear axle assemblies are used on The rear axle assembly consists of the following
Genesis tractors. components:
The Model 8670(A)/2145 tractor uses one style • Drive pinion and differential ring gear
of rear axle assembly, while Models
8770(A)/2160, 8870(A)/2180, and 8970(A)/2210 • Differential carrier
use a second version capable of handling higher
horsepower. • Hydraulic differential lock assembly
The chart below identifies some of the • Final reduction gears
differences between the two axle assemblies.
• Axle shaft and housing
The rear axle assembly is attached to the rear of
• PTO components
the transmission. The rear axle assembly
connects the power from the engine and • Park brake
transmission to the rear wheels.
• Front wheel drive clutch assembly, if equipped
AREA 8670/2145 8770/8870/8970/
2160/2180/2210
Axle Diameter 92 mm (3.625”) 105 mm (4.125”)
PTO Speeds 540/1000 1000
Brake Friction 2 2
Discs (Each Side)
5-1-2
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-1
PINION AND RING GEAR
The drive from the transmission output shaft is 1 Drive pinion
transmitted through a drive coupling to the pinion 2 Park brake
gear, 1. The pinion is located in the rear axle
center housing by two preloaded, tapered roller 3 Differential ring gear
bearings. 4 Differential lock assembly
The pinion gear transfers power to the ring gear, 5 PTO components
3, which is bolted to the differential carrier (Models 8770(A)/2160,
assembly, 12. 8870(A)/2180, 8970(A)/2210 shown)
6 Planetary gears
7 Wheel brake components
8 Left-hand axle housing
9 Left-hand axle shaft
10 Sun gear
11 Planetary ring gear
12 Differential carrier
5-1-3
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-2
DIFFERENTIAL CARRIER
The ring gear, 2, and differential carrier Drive from the pinion gear is transmitted through
assembly, 1, are supported between tapered the ring gear, 2, and differential carrier assembly,
roller bearings, 3 and 10. The bearings are 1, to the differential pinion shafts, 8. The shafts
mounted in supports, 4 and 11, which bolt in from pass through and are pinned to the differential
each side of the center housing. carrier. Each differential pinion shaft has one or
two pinion gears, 12. All four pinion gears are in
The differential carrier assembly consists of three constant mesh with two side gears, 9, that deliver
differential pinion shafts, 8; four pinion gears, 12; power to intermediate shafts.
two side gears, 9; the differential lock cover plate,
5; differential lock piston, 6; and plates, 7.
5-1-4
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-3
FINAL REDUCTION DRIVE
The inner end of the intermediate shaft is splined The planet gears mesh with a fixed position ring
to the differential side gears. The outer end forms gear, 1. As the sun gear end of the intermediate
the sun gear, 4, for the planetary reduction gear shaft revolves, the planet gears are forced to
sets in the axle housing. The planetary assembly rotate around the inside of the fixed position ring
increases torque to the rear wheels. gear. This causes the planet gear carrier to rotate
at a reduced speed which transmits increased
Around the sun gear, 4, are planet gears, 2. torque to the axle shaft.
Model 8670(A)/2145 tractors use four planet
gears while Models 8770(A)/2160, The inner end of the axle shaft is splined to the
8870(A)/2180, and 8970(A)/2210 tractors use planet gear carrier. The outer end of the axle
three planet gears. The planet gears are shaft is supported by a bearing. Power is
mounted in a carrier, 5, which is splined to the transmitted through the shaft to the wheels.
inner end of the rear axle shaft, 3.
5-1-5
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-4
DIFFERENTIAL LOCK MECHANICAL The differential lock assembly is composed of
OPERATION three plates, 4, internally splined to the right-hand
side gear, 2, and three plates with external lugs,
When the tractor is operating without the 5, that engage the differential carrier.
differential lock engaged, when one wheel starts
to slip, all the drive is transmitted to the slipping A piston, 3, housed within the differential carrier
wheel and traction is lost. is used to compress the plates.
To regain traction, the tractor is equipped with an
electrohydraulically operated differential lock.
When engaged, the differential lock forces the
right-hand side gear, 2, to lock against the
differential carrier assembly, 1, which provides
direct drive to both wheels.
5-1-6
SECTION 5 - REAR AXLE (Rear Axle Assembly)
70 SERIES DIFFERENTIAL LOCK
CONTROL SYSTEM OPERATION
Normal Operation
An electrohydraulically activated, self-holding
differential lock is installed on all models. In
conditions inducing wheel slip, momentarily
press the front (orange) part of the switch, 2, to
lock the rear wheels together. When the
differential lock is engaged, the switch is
internally illuminated.
NOTE: Diff-lock will automatically disengage
if one brake is applied. Both modes of
diff-lock will automatically disengage if the
tractor is operated above 16 km/h (10 MPH). Figure 5-1-5
Automatic Operation
NOTE: Lamp, 1, on the instrument cluster will
only illuminate when automatic differential
lock is engaged.
Press the front of the switch, 2, two times within
one second for automatic diff-lock. When in this
mode, the diff-lock will automatically disengage
and reengage when one brake is applied then
released, or when the three-point hitch
Raise/Work switch is activated to raise, then
lower, the hitch. This function allows the diff-lock
to disengage on end rows when turning and
reengage when the implement is lowered.
Depress the rear of the switch, 2, to disengage
diff-lock.
5-1-7
SECTION 5 - REAR AXLE (Rear Axle Assembly)
70A/2000 SERIES DIFFERENTIAL LOCK
CONTROL SYSTEM OPERATION
Introduction
A self--holding differential lock is installed in the
rear axle to lock the rear wheels together in
conditions where wheel slip is encountered.
Units equipped with Traction Control System
(TCS) four wheel drive, also come with a fully
locking electro-hydraulically engaged front axle
differential lock.
Engaging and Disengaging Differential
Lock
Figure 5-1-6
To engage the differential lock, the FAST
RAISE/WORK switch must be in the lower Auto differential lock will disengage when one
position, then depress and release the front part brake is applied or when the 3--point hitch FAST
of the switch,1. The switch will return to the center RAISE/WORK switch is in the fast raise position.
position, but the differential lock will be activated.
Auto differential lock will reengage when the
The switch indicator light will illuminate to brake is released or when the FAST
indicate the differential lock is engaged. RAISE/WORK switch is returned to the work
position.
NOTE: Diff--lock will disengage if one brake is
applied or when the 3--point hitch FAST If equipped with TCS, the front and rear
RAISE/WORK switch is in the fast raise position differential locks will disengage and reengage
or if the unit is operated above 16 kph (10 MPH ). the same as in AUTO mode as well as with turn
TCS will disengage at 10 kph (6 MPH) or below at angles. TCS will disengage at 10 kph (6 MPH) or
turn angles of 20 degrees or higher or between below at turn angles of 20 degrees or higher and
10-15 kph (6-9 MPH) at turn angles of 10 degrees reengage at angles less than 20 degrees, or
or higher. In manual operation mode as between 10-15 kph (6-9 MPH) at turn angles of
described above the differential lock or TCS will 10 degrees or higher and reengage at angles
not reengage automatically and must be less than 10 degrees.
reengaged manually.
The indicator light on the instrument panel will go
To turn off the differential lock, depress then out when auto differential lock or TCS has
release the rear part of the switch or apply either disengaged.
of the foot brakes.
To turn off auto differential lock or TCS, depress
the rear part of the switch.
ENGAGING AND DISENGAGING THE
DIFFERENTIAL LOCK IN EITHER THE NOTE: Auto differential lock or TCS will
AUTOMATIC MODE OR THE TCS MODE automatically disengage if the unit is operated
above 16 kph (10 MPH ).
To engage the differential lock in either the
Automatic mode or TCS mode press and release
the front of the lock switch twice within one WARNING
second. Never use the differential lock at speeds
above 8 kph (5 mph) or when turning the
The amber differential lock lamp in the instrument tractor. When engaged, the differential lock
panel will illuminate to indicate the differential will prevent the tractor from turning.
lock is on in either Automatic mode or TCS mode.
IMPORTANT: If a rear wheel spins at high speed,
reduce engine speed before engaging the
differential lock to avoid shock loads to the
driveline.
5-1-8
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-7
DIFFERENTIAL LOCK ELECTRICAL Current to operate the circuit originates at the
CIRCUIT OPERATION 5-amp right-hand console fuse (MDP-21) and
travels to the differential lock switch.
An electrical circuit, consisting of fuses, a control
switch, control modules, Fast Raise/Work switch, Depressing the front or rear of the switch
brake switches, and a solenoid, controls oil flow momentarily sends current to the right-hand
to the differential lock piston that engages the Control Module (RHC) on the appropriate wire.
differential lock.
5-1-9
SECTION 5 - REAR AXLE (Rear Axle Assembly)
The terminal on which the RHC module receives The differential lock solenoid, 1, is located on the
current from the switch indicates to the module if PTO housing at the rear of the tractor. The
the differential lock should be engaged or solenoid has a resistance of 9.4 ohms.
disengaged.
When the tractor has a steering sensor and the
The RHC module then signals the Chassis differential lock switch is turned on, the steering
Control Module (CCM) to activate or deactivate angle pot may send a signal to the CCM
the differential lock solenoid. depending on the angle of the front wheels. The
CCM then will activate or deactivate the
When the solenoid is powered with battery differential lock solenoid on the PTO housing at
voltage, the differential lock is engaged. The the rear of the tractor.
differential lock is not engaged when the solenoid
is not powered.
Applying one brake switch will disengage the
differential lock. This is accomplished by
supplying current from the 5-amp front console
fuse (MDP-22) through the normally closed
contacts on the stop light switches to the
appropriate terminals at the Electronic
Instrument Cluster (EIC) module.
When a brake switch is depressed, current flow
to the EIC is interrupted. This current loss
indicates to the EIC to signal the CCM to stop
current flow to the differential lock solenoid.
The differential lock also disengages when the
fast raise circuit is activated or the tractor
exceeds 16 km/h (10 MPH). In both cases, the
CCM receives a signal to stop current flow to the
differential lock solenoid.
When the tractor is in Automatic or TCS mode,
FWD will automatically disengage when either
brake pedal is used to assist in turning or at
transport speeds above 24.2 km/h (15 MPH)
which reduces tire wear. The FWD will
automatically reengage when transport speed
drops below 24.2 KPH (15 MPH) and when the
applied foot brake is released.
TCS will also disengage and reengage under the
following conditions:
At speeds of 0-10 kph ( 0-6 MPH) disengage
at turn angles of 30 degrees or higher and
reengage at angles less than 30 degrees.
Or between 10-20 kph (6-13 MPH)
disengage at turn angles of 25 degrees or Figure 5-1-8
higher and reengage at angles less than 25
degrees.
5-1-10
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL LOCK HYDRAULIC
CIRCUIT OPERATION
NOTE: 70 Series art is shown.
Oil to operate the differential lock is regulated at
16.50 kPa -18.60 kPa (240 PSI - 270 PSI) by the
low pressure regulating in the transmission valve
body.
Oil enters the PTO housing at 2, and is directed to
the differential lock solenoid, 1.
The differential lock is engaged when the
differential lock solenoid receives battery
voltage.
Figure 5-1-9
FRONT AXLE DIFFERENTIAL LINE
(70A/2000 SERIES)
To operate the front axle diff. lock, a new
hydraulic line, 1, has been added from the test
port on the rear differential, along the left--hand
side of tractor, to the front differential. You will use
this one test port, 2, to check pressure for both
the front and rear differentials.
Figure 5-1-10
Figure 5-1-11
5-1-11
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-12
When powered, the solenoid opens to allow Oil pressure acts against the piston causing it to
pressurized oil to flow through a steel line to compress the clutch plates, 4 and 5, which locks
fitting, 2, and through passage, 3, to the the differential.
differential lock piston, 1.
When the solenoid is not powered, it blocks oil
flow to the piston releasing the clutch discs.
5-1-12
SECTION 5 - REAR AXLE (Rear Axle Assembly)
TROUBLESHOOTING
DIFFERENTIAL LOCK WILL NOT ENGAGE
Perform the following preliminary steps before 3. Retrieve current fault codes from Mode 1.
proceeding to the troubleshooting charts: Refer to Section 3, Chapter 1 for details on
retrieving current fault codes.
1. Check the following systems for proper
operation: NOTE: Proceed to step four if current fault
codes exist. Proceed to step five if no current
• PTO fault codes exist.
• Transmission
• 3-point fast raise 4. Correct fault codes using the diagnostic
• FWD (if equipped) charts in Section 3, Chapter 2.
• TCS (if equipped)
5. Perform an inspection of the diff-lock system
NOTE: If all these systems do not operate, and correct loose or damaged electrical
check for a common current supply problem. wires, connectors, or hydraulic components.
Refer to the wiring schematics in Section 3, 6. Proceed to the following electrical
Chapter 6. troubleshooting chart:
2. Verify the differential lock system is not
operating properly. Proceed if the system is
not working properly.
NOTE: The 3-point Fast Raise/Work switch
must be in the work position and both brake
pedals must be fully released for the
differential lock system to operate properly.
Make sure that the fast raise/work system
operates properly before proceeding.
NOTE: If equipped with TCS, the steering
must be centered and properly calibrated for
the differential lock system to work properly.
Make sure the TCS system is working
properly before proceeding.
5-1-13
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL-LOCK WILL NOT ENGAGE
ELECTRICAL CIRCUIT TROUBLESHOOTING
5-1-14
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL-LOCK WILL NOT ENGAGE
(continued from previous page)
5-1-15
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL-LOCK WILL NOT ENGAGE
(continued from previous page)
5-1-16
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL-LOCK WILL NOT ENGAGE
(continued from previous page)
5-1-17
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL-LOCK WILL NOT ENGAGE
HYDRAULIC CIRCUIT TROUBLESHOOTING
5-1-18
SECTION 5 - REAR AXLE (Rear Axle Assembly)
TROUBLESHOOTING
DIFFERENTIAL LOCK WILL NOT DISENGAGE
Perform the following preliminary steps before 3. Retrieve current fault codes from Mode 1.
proceeding to the troubleshooting charts: Refer to Section 3, Chapter 1 for details on
retrieving current fault codes.
1. Check the following systems for proper
operation: NOTE: Proceed to step four if current fault
codes exist. Proceed to step five if no current
• PTO fault codes exist.
• Transmission
• 3-point fast raise 4. Correct fault codes using the diagnostic
• FWD (if equipped) charts in Section 3, Chapter 2.
• Traction Control System (if equipped)
5. Perform an inspection of the diff-lock system
NOTE: If all these systems do not operate, and correct loose or damaged electrical
check for a common current supply problem. wires, connectors, or hydraulic components.
Refer to the wiring schematics in Section 3, 6. Proceed to the following electrical
Chapter 6. troubleshooting chart:
2. Verify the differential lock system is not
operating properly. Proceed if the system is
not working properly.
NOTE: The 3-point fast raise/work switch
must be in the work position and both brake
pedals must be fully released for the
differential lock system to operate properly.
Make sure Fast Raise/Work system
operates properly before proceeding.
NOTE: If equipped with TCS, the steering
must be centered and properly calibrated for
the differential lock system to work properly.
5-1-19
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL-LOCK WILL NOT DISENGAGE
ELECTRICAL CIRCUIT TROUBLESHOOTING
5-1-20
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL-LOCK WILL NOT DISENGAGE
HYDRAULIC CIRCUIT TROUBLESHOOTING
5-1-21
SECTION 5 - REAR AXLE (Rear Axle Assembly)
SPECIFICATIONS
AXLE ASSEMBLY: 8670/2145 8770(A)/8870(A)/8970(A)/
2160/2180/2210
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Double reduction Inboard planetary
Planet ring gear teeth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 . . . . . . . . . . . . . 69
Number of planet gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 .............. 3
Planet gear teeth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 . . . . . . . . . . . . . 27
Sun gear teeth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 . . . . . . . . . . . . . 15
Final drive ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.941 . . . . . . . . . . 5.600
Differential final drive reduction . . . . . . . . . . . . . . . . . . . . . . . . . 27.794:1 . . . . . . . . 27.491:1
Output axle type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bar . . . . . . . . . . . . Bar
Axle diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 mm (3.625″) . . 105 mm (4.125″)
Axle length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243.8 cm (96″), 284.5 cm (112″),
or 304.8 cm (120″)
DIFFERENTIAL:
Pinion teeth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . . . . . . . . . . . . . . . . . . 11
Pinion preload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1-2.2 N·m rolling torque (10-20 in. lbs.)
Ring gear backlash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Etched on ring gear ± 0.05 mm (0.002″)
Ring gear teeth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 . . . . . . . . . . . . . . . . . 54
Reduction ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.625 . . . . . . . . . . . . . . 4.909
Support bearing preload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025-0.152 N·m (0.001-0.006 in. lbs.)
Number of spider gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 .................. 4
Spider gear teeth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 . . . . . . . . . . . . . . . . . 13
Side gear teeth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 . . . . . . . . . . . . . . . . . 43
Side and spider gear support . . . . . . . . . . . . . . . . . . . . . . . . . . Needle bearings
DIFFERENTIAL LOCK:
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrohydraulic
Method of engagement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Switch activated, hydraulically applied
Number of friction plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 .................. 3
Number of separator plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 .................. 3
Solenoid type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normally closed . . . . . Normally closed
Solenoid coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 volts . . . . . . . . . . . . . 12 volts
Solenoid coil resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.4 ohms . . . . . . . . . . . 9.4 ohms
Hydraulic apply pressure (at 1900 ERPM) . . . . . . . . . . . . . . . 16.5 Bar -18.9 Bar (240 PSI - 270 PSI)
SEALERS:
Anaerobic sealer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LOCTITE GASKET ELIMINATOR 518
RTV silicone sealer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LOCTITE SUPERFLEX 593, 595, or 596
LOCTITE ULTRA BLUE 587
Pipe sealant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PST 592 PIPE SEALANT WITH TEFLON
Thread-locking compound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LOCTITE 271 THREADLOCKER/SEALANT
(red)
5-1-22
SECTION 5 - REAR AXLE (Rear Axle Assembly)
TIGHTENING TORQUES
N·m (Ft. Lbs.)
Axle shaft retaining bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 ................. (440)
Axle housing retaining bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . 270 ................. (200)
Differential case bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 ................. (180)
Differential bearing housing support bolts . . . . . . . . . . . . . . . 108 ................. (80)
Outer pinion jam nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 ................. (90)
Ring gear bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338 ................. (250)
Cab mount bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217 ................. (160)
Cab mount bracket to rear axle
Model 8670(A)/2145 . . . . . . . . . . . . . . . . . . . . . . . . . . . 306 . . . . . . . . . . . . . . . . . (226)
Models 8770(A)/2160, 8870(A)/2180, 8970(A)/2210 239 . . . . . . . . . . . . . . . . . (177)
Top cover bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332 . . . . . . . . . . . . . . . . . (245)
Drawbar support bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635 . . . . . . . . . . . . . . . . . (470)
Drawbar support anchor bolts . . . . . . . . . . . . . . . . . . . . . . . . . 635 . . . . . . . . . . . . . . . . . (470)
Drain plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 . . . . . . . . . . . . . . . . . (50)
Pinion shaft jam nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 . . . . . . . . . . . . . . . . . (95)
Park brake bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 . . . . . . . . . . . . . . . . . (45)
FWD cover plate bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 . . . . . . . . . . . . . . . . . (60)
Hydraulic pump drive housing bolts . . . . . . . . . . . . . . . . . . . . 108 . . . . . . . . . . . . . . . . . (80)
Differential lock solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 . . . . . . . . . . . . . . . . . (20)
Differential lock coil nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 . . . . . . . . . . . . . . . . . . (5)
LUBRICANTS
Oil type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . hydraulic/transmission fluid (see operator’s manual)
Transmission and Rear Axle Oil Capacity: 2145 2160/2180/2210
Liters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 . . . . . . . . . . . . . . . . 140
U.S. Gallons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (30.9) . . . . . . . . . . . . . . (36.9)
NOTE: More oil will be required if the total system is drained and cleaned.
SPECIAL TOOLS
Description Part Number Usage
Axle seal installation tool . . . . . . . . . . . . . . BLR20019 . . . . . . . . . . . . . . . . . . . Install axle seals on all models
Pinion nut spanner wrench . . . . . . . . . . . . BLR20021 . . . . . . . . . . . . . . . . . . . Remove and install pinion
adjusting and locknuts
5-1-23
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DEALER CONSTRUCTED SPECIAL
TOOLS
Refer to the appropriate figure for tool
dimensions and construction information.
NOTE: Dimensions in inches
70S001
Cab tilting tool
All Models
Figure 5-1-13
70S002
Rear axle shaft housing lifting tool
All Models
NOTE: Dimensions in inches
Figure 5-1-14
70S003
Rear axle differential lifting tool
All Models
NOTE: Dimensions in inches
Figure 5-1-15
5-1-24
SECTION 5 - REAR AXLE (Rear Axle Assembly)
70S005
Pinion rotating tool
All Models
NOTE: Dimensions in inches
Figure 5-1-16
70S006
Needle bearing retainer - Differential spider
gears
All Models
NOTE: Dimensions in inches
Figure 5-1-17
70S007
Planetary gear assembly lifting tool
Model 8670(A)/2145
NOTE: Dimensions in inches
Figure 5-1-18
5-1-25
SECTION 5 - REAR AXLE (Rear Axle Assembly)
70S008
Planetary gear assembly lifting tool
Models 8770(A)/2160, 8870(A)/2180,
8970(A)/2210
NOTE: Dimensions in inches
Figure 5-1-19
70S009
Rear axle shaft housing rolling torque tool
Models 8770(A)/2160, 8870(A)/2180,
8970(A)/2210
NOTE: Dimensions in inches
Figure 5-1-20
70S010
Rear axle shaft housing rolling torque tool
Model 8670(A)/2145
NOTE: Dimensions in inches
Figure 5-1-21
5-1-26
SECTION 5 - REAR AXLE (Rear Axle Assembly)
70S011
Needle bearing retainer - Planetary gear
Models 8770(A)/2160, 8870(A)/2180,
8970(A)/2210
NOTE: Dimensions in inches
Figure 5-1-22
70S012
Needle bearing retainer - Planetary gear
Model 8670(A)/2145
NOTE: Dimensions in inches
Figure 5-1-23
70S013
Pinion shaft removal plate
All Models
NOTE: Dimensions in inches
Figure 5-1-24
5-1-27
SECTION 5 - REAR AXLE (Rear Axle Assembly)
70S015
Axle removing tool
Models 8770(A)/2160, 8870(A)/2180,
8970(A)/2210
NOTE: Dimensions in inches
Figure 5-1-25
70S018
Axle removing tool
Model 8670(A)/2145
NOTE: Dimensions in inches
Figure 5-1-26
70S019
Stationary planetary ring gear removing tool
Model 8670(A)/2145
NOTE: Dimensions in inches
Figure 5-1-27
5-1-28
SECTION 5 - REAR AXLE (Rear Axle Assembly)
70S020
Axle housing support stand
All Models
NOTE: dimensions in inches
Figure 5-1-28
5-1-29
SECTION 5 - REAR AXLE (Rear Axle Assembly)
ADJUSTMENTS
AXLE SHAFT BEARING PRELOAD
ADJUSTMENT - ALL MODELS
The preload adjustment procedure is the same
for all models.
NOTE: Check preload anytime the pinion
assembly is disassembled.
Tools Required:
Assorted hand tools
Torque wrenches
- 675 N·m (500 ft. lbs.)
- 11 N·m (100 in. lbs.)
Depth micrometer
Micrometer 0 to 25 mm (0 to 1″)
Dealer-constructed tools (see “Special Tools”
heading for details)
- Axle housing support stand - 70S020
- Axle rolling torque measuring tool - 70S010
(Model 8670(A)/2145)
- Axle rolling toque measuring tool - 70S009
(Models 8770(A)/2160, 8870(A)/2180,
8970(A)/2210)
PRELOAD ADJUSTMENT
Figure 5-1-29
IMPORTANT: Check preload with bearings
lubricated and axle seal removed.
IMPORTANT: Rotate pinion shaft 10 revolutions
before rolling torque is measured. Measure
torque while housing is rotating.
5-1-30
SECTION 5 - REAR AXLE (Rear Axle Assembly)
1. Install retaining bolt, 1, and retaining washer,
2.
NOTE: Do not install shims between
washer and axle.
NOTE: Inspect retaining washer for
bending or deflection. Any type of a bend
or deflection in this part will cause a loss
of axle preload, which can contribute to
an axle seal failure. Maximum
bend/deflection should not exceed 0.05
mm (0.002″).
Figure 5-1-30
2A. MODEL 8670(A)/2145 - Install #70S010
rolling torque tool, 1, and measure rolling
torque.
IMPORTANT: Rotate axle housing ten
revolutions before measuring rolling torque
while housing is rotating.
Figure 5-1-31
2B. MODELS 8770(A)/2160, 8870(A)/2180,
8970(A)/2210 - Install #70S009 rolling
torque tool and measure rolling torque.
IMPORTANT: Rotate axle housing ten
revolutions before measuring rolling torque
while housing is rotating.
Figure 5-1-32
5-1-31
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Perform rolling torque testing while gradually
tightening retaining bolt until specified rolling
torque is obtained:
MODEL 8670(A)/2145
5.5 N·m -11 N·m (50 in. lbs. - 100 in. lbs.)
MODELS 8770(A)/2160, 8870(A)/2180,
8970(A)/2210
3.3 N·m - 8.8 N·m (30 in. lbs. - 80 in. lbs.)
Figure 5-1-33
4. Remove bolt, 1, and washer, 2, after
specified rolling torque is obtained.
Figure 5-1-34
5. Use a depth micrometer to measure distance
to the axle.
Figure 5-1-35
5-1-32
SECTION 5 - REAR AXLE (Rear Axle Assembly)
6. Measure distance to the planetary carrier.
Figure 5-1-36
7. Subtract measurement obtained in Step 6
from dimension obtained in Step 5. The
remainder is the thickness of the shim pack.
EXAMPLE:
Step 5 dimension 53.34 mm (2.100″)
Step 6 dimension -- 52.07 mm (2.050″)
Shim pack 1.27 mm (0.050″)
8. Select shims, 3, to equal calculated shim
pack thickness ± 0.050 mm (0.002″).
9. Install shims, 3; retaining washer, 2; and bolt,
1.
Figure 5-1-37
5-1-33
SECTION 5 - REAR AXLE (Rear Axle Assembly)
10. Torque the retaining bolt to 608 N·m (450 ft.
lbs.).
Figure 5-1-38
11. Check rolling torque for specified value
stated in step 3.
IMPORTANT: If torque is low - Remove
retaining bolt, washer, and shims, then return
to step 1.
If torque is high - Remove retaining bolt,
washer, and shims. Lift up on housing and
strike shaft to establish slight free play
between bearing and race. Return to step 1.
IMPORTANT: If rolling torque is correct,
check for end play by prying between
planetary carrier and axle housing. If there is
free play, return to step 1.
Figure 5-1-39
12. When proper rolling torque is established,
return to the appropriate axle housing
reassembly instructions and complete
reassembly.
5-1-34
SECTION 5 - REAR AXLE (Rear Axle Assembly)
PINION DEPTH ADJUSTMENT - ALL
MODELS
The procedure to determine pinion depth is
similar for all models.
NOTE: The formula to calculate the pinion
depth shim pack for the Model 8670(A)/2145
is different from the formula used on Models
870(A)/2160, 8870(A)/2180, and 8970(A)/2210.
NOTE: Check pinion depth anytime the
pinion shaft, rear pinion bearing, or center
housing is changed. Improper pinion depth
adjustment will result in premature wear of
the ring and pinion gears.
Tools Required: Figure 5-1-40
Assorted hand tools
Depth micrometer - 51 mm - 76 mm (2″ - 3″)
Micrometer - 0 to 25 mm (0 to 1″)
ADJUSTMENT PROCEDURE
1. Record the Center Housing Machine Depth
(CHMD) dimension that is stamped in the
housing flange above the pinion shaft.
NOTE: The CHMD dimension is in
millimeters.
EXAMPLE: Record CHMD 312020 stamped
in housing as 312.020 mm.
Figure 5-1-41
2. Record the + or - symbol and Pinion
Machining Deviation (PMD) number etched
in the end of the pinion gear.
NOTE: The PMD dimension is in inches.
Multiply dimension by 25.4 to convert to
millimeters.
EXAMPLE:
PMD dimension = (0.009″)
(0.009″) x 25.4 = 0.2286 mm
Figure 5-1-42
5-1-35
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Place the rear pinion bearing assembly on a
hard, flat, smooth surface as shown.
NOTE: If the bearing is measured in any
way other than with the bearing cup on
top of the bearing cone, the measurement
will not be accurate.
4. Rotate the cone in the cup while applying 9
kg - 13.5 kg (20 lbs. - 30 lbs.) to seat the
bearing.
5. Measure the thickness of the bearing
assembly to three decimal points with a
depth micrometer while applying 9 kg - 13.5
kg (20 lbs. - 30 lbs.) to seat the bearing.
Figure 5-1-43
6. Record the dimension in step 5 as the Pinion
Bearing Thickness (PBT).
NOTE: If the measurement was taken in
inches, multiply the dimension by 25.4 to
convert to millimeters.
EXAMPLE:
Pinion bearing thickness = (2.080″)
(2.080″) x 25.4 = 52.830 mm
NOTE: Bearing thickness should fall
within the following dimensions. Check
measurement if not within limits.
MODEL 8670(A)/2145
53.98 mm - 54.18 mm (2.125″ - 2.133″)
MODELS 8770(A)/2160, 8870(A)/2180,
8970(A)/2210
52.76 mm - 52.96 mm (2.077″ - 2.085″)
7. Calculate shim pack thickness, 1, by
substituting the dimensions obtained in steps
1, 2 and 6, then proceed to step 8.
NOTE: Select the example that
corresponds to the tractor model being
worked on and the appropriate + or - sign
on the pinion shaft.
Figure 5-1-44
5-1-36
SECTION 5 - REAR AXLE (Rear Axle Assembly)
MODEL 8670(A)/2145 - EXAMPLE #1
(Use this example if there is a + or no sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1) 277.440 mm
Pinion Depth Constant used for Model 2145 -- 222.377 mm
Pinion Machine Deviation (+) (From step 2) -- 0.228 mm
Pinion Bearing Thickness (From step 6) -- 54.070 mm
Constant used for Model 8670(A)/2145 -- 0.130 mm
SHIM PACK = 0.635 mm
MODEL 8670(A)/2145 - EXAMPLE #2
(Use this example if there is a -- sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1) 277.440 mm
Pinion Depth Constant used for Model 2145 -- 222.377 mm
Pinion Machine Deviation (--) (From step 2) + 0.228 mm
Pinion Bearing Thickness (From step 6) -- 54.070 mm
Constant used for Model 8670(A)/2145 -- 0.130 mm
SHIM PACK = 1.091 mm
MODELS 8770(A)/2160, 8870(A)/2180, 8970(A)/2210 - EXAMPLE #1
(Use this example if there is a + or no sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1) 312.020 mm
Pinion Depth Constant used for Models 2160, 2180, 2210 -- 258.000 mm
Pinion Machine Deviation (+) (From step 2) -- 0.228 mm
Pinion Bearing Thickness (From step 6) -- 52.830 mm
Constant used for Models 8770(A)/2160,
8870(A)/2180, 8970(A)/2210 -- 0.080 mm
SHIM PACK = 0.882 mm
MODELS 8770(A)/2160, 8870(A)/2180, 8970(A)/2210 - EXAMPLE #2
(Use this example if there is a -- sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1) 312.020 mm
Pinion Depth Constant used for Models 2160, 2180, 2210 -- 258.000 mm
Pinion Machine Deviation (--) (From step 2) + 0.228 mm
Pinion Bearing Thickness (From step 6) -- 52.830 mm
Constant used for Models 8770(A)/2160,
8870(A)/2180, 8970(A)/2210 -- 0.080 mm
SHIM PACK = 1.338 mm
5-1-37
SECTION 5 - REAR AXLE (Rear Axle Assembly)
MODEL 8670(A)/2145 - TEMPLATE #1
(Use this template if there is a + or no sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1) ___________
Pinion Depth Constant used for Model 2145 -- 222.377 mm
Pinion Machine Deviation (+) (From step 2) --
Pinion Bearing Thickness (From step 6) --
Constant used for Model 8670(A)/2145 -- 0.130 mm
SHIM PACK = ____________
MODEL 8670(A)/2145 - TEMPLATE #2
(Use this template if there is a -- sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1)
Pinion Depth Constant used for Model 2145 -- 222.377 mm
Pinion Machine Deviation (--) (From step 2) +
Pinion Bearing Thickness (From step 6) --
Constant used for Model 8670(A)/2145 -- 0.130 mm
SHIM PACK = ____________
MODELS 8770(A)/2160, 8870(A)/2180, 8970(A)/2210 - TEMPLATE #1
(Use this template if there is a + or no sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1)
Pinion Depth Constant used for Models 2160, 2180, 2210 -- 258.000 mm
Pinion Machine Deviation (+) (From step 2) --
Pinion Bearing Thickness (From step 6) --
Constant used for Models 8770(A)/2160,
8870(A)/2180, 8970(A)/2210 -- 0.080 mm
SHIM PACK = ____________
MODELS 8770(A)/2160, 8870(A)/2180, 8970(A)/2210 - TEMPLATE #2
(Use this template if there is a -- sign in front of the PMD dimension on the pinion gear.)
Center Housing Machine Depth (From step 1)
Pinion Depth Constant used for Models 2160, 2180, 2210 -- 258.000 mm
Pinion Machine Deviation (--) (From step 2) +
Pinion Bearing Thickness (From step 6) --
Constant used for Models 8770(A)/2160,
8870(A)/2180, 8970(A)/2210 -- 0.080 mm
SHIM PACK = ____________
NOTE: The above templates are for figuring Pinion Bearing Thickness only. There are four total givens;
the Pinion Depth Constant, the Constant for either model (8670(A)/2145, 8770(A)/2160, 8870(A)/2180
and 8970(A)/2210) and the two other givens, the CHMD and the PMD will be found on the machine and
the pinion gear itself.
5-1-38
SECTION 5 - REAR AXLE (Rear Axle Assembly)
8. Round off the calculated shim pack
dimension to one decimal point.
EXAMPLE:
1.338 mm = 1.3 mm
9. Select shims, 1, required to equal the
rounded off shim pack dimension.
NOTE: Shims are available in the
following thicknesses: 0.50 mm, 0.60 mm,
0.70 mm, 0.80 mm, 0.90 mm.
10. Measure shims with a micrometer to verify
thickness.
11. Proceed to step 2 in the “Reassembly” portion
of the “Pinion Assembly Overhaul” section in
this chapter.
Figure 5-1-45
5-1-39
SECTION 5 - REAR AXLE (Rear Axle Assembly)
PINION BEARING PRELOAD
ADJUSTMENT - ALL MODELS
The preload adjustment procedure is the same
for all models.
NOTE: Check preload anytime the pinion
assembly is disassembled.
Tools Required:
Assorted hand tools
Torque wrenches
- 135 N·m (100 ft. lbs.)
- 11 N·m (100 in. lbs.)
Rear axle pinion nut tool - BLR20021
Dealer-constructed tool (see “Special Tools” Figure 5-1-46
heading in this chapter for details.)
- Pinion rotating tool - #70S005
PRELOAD ADJUSTMENT
IMPORTANT: Check preload with pinion
bearings lubricated with specified rear axle
assembly oil.
IMPORTANT: Rotate pinion shaft 15 revolutions
before rolling torque is measured. Measure
rolling torque while pinion shaft is rotating.
Correct preload is 1.1 N·m - 2.2 N·m (10 in. lbs. -
20 in. lbs.) of rolling torque.
1. Check to make sure adjusting nut, 1, is
installed with flat side contacting the bearing.
Figure 5-1-47
2. Install BLR20021 special tool, 1, on nut and
#70S005 dealer-made pinion rotating tool, 2,
on pinion shaft.
3. Tighten nut until slight rolling resistance is
obtained.
Figure 5-1-48
5-1-40
SECTION 5 - REAR AXLE (Rear Axle Assembly)
4. Measure rolling torque after rotating pinion
shaft 15 revolutions.
5. Continue to adjust nut and measure rolling
torque until the correct preload of 1.1 N·m -
2.2 N·m (10 in. lbs. - 20 in. lbs.) of rolling
torque is obtained.
Figure 5-1-49
6. Install lock washer, 1, and jam nut, 2.
NOTE: Install jam nut with tapered side
facing the adjusting nut.
Figure 5-1-50
7. Install BLR20021 special tool, 1, on nut and
#70S005 dealer-made pinion rotating tool, 2,
on pinion shaft.
8. Torque jam nut to 128 N·m (95 ft. lbs.).
Figure 5-1-51
5-1-41
SECTION 5 - REAR AXLE (Rear Axle Assembly)
9. Check for proper rolling torque.
IMPORTANT: Adjust preload if not to
specification.
Figure 5-1-52
10. Seat lock washer tabs in a slot on each nut.
Figure 5-1-53
5-1-42
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL SUPPORT BEARINGS
PRELOAD ADJUSTMENT -
ALL MODELS
The preload adjustment procedure is the same
for all models.
NOTE: Check preload anytime the differential
assembly is removed or end caps are
removed. Preload must be within
specifications before pinion backlash is
checked or adjusted.
Tools Required:
Assorted hand tools
Torque wrench - 135 N·m (100 ft. lbs.)
Micrometer - 0 to 25 mm (0 to 1″)
Feeler gauge
Figure 5-1-54
PRELOAD ADJUSTMENT
1. Install the left-hand support using the original
shims removed,or new shims of the same
thickness.
Figure 5-1-55
5-1-43
SECTION 5 - REAR AXLE (Rear Axle Assembly)
2. Tighten six retaining bolts to 108 N·m (80 ft.
lbs.).
Figure 5-1-56
3. Install the right-hand support using the
original shims removed, or new shims of the
same thickness.
1
NOTE: Location of cast notch, 1, may vary
depending on supplier processes casting.
Figure 5-1-57
4. Tighten right-hand retaining bolts hand tight.
IMPORTANT: Ensure there is backlash
between the ring and pinion gears before
proceeding. Remove shims from left support
and add shims to right support to increase
backlash.
Figure 5-1-58
5-1-44
SECTION 5 - REAR AXLE (Rear Axle Assembly)
5. Use a feeler gauge to measure the gap
between the right-hand shims and center
housing. Measure at four different locations
90° apart.
Proceed to the indicated step based on
measurement results:
• Feeler gauge measurement is 0.025 mm -
0.152 mm (0.001″ - 0.006″). Bearing
preload is correct, proceed to step 8.
• Feeler gauge measurement is below
0.025 mm (0.001″), proceed to step 6.
• Feeler gauge measurement is over 0.152
mm (0.006″), proceed to step 7.
Figure 5-1-59
6. If measurement is below 0.025 mm (0.001″),
remove shims from the right-hand side and
repeat step 5.
7. If measurement is over 0.152 mm (0.006″),
add shims to the right-hand side and repeat
step 5.
8. Torque the right side hardware to 108 N·m
(80 ft. lbs.).
Figure 5-1-60
9. Check “Pinion Backlash,” as described in the
“Adjustment” heading of this chapter, before
proceeding to reassemble the rear axle.
Figure 5-1-61
5-1-45
SECTION 5 - REAR AXLE (Rear Axle Assembly)
RING AND PINION GEAR BACKLASH
ADJUSTMENT - ALL MODELS
The backlash adjustment procedure is the same
for all models.
NOTE: Check backlash anytime the
differential assembly is removed or adjusted.
Improper backlash will result in premature
wear of the ring and pinion gears.
IMPORTANT: Check backlash after the
differential bearing preload has been properly
adjusted and before installing axle assemblies.
Tools Required:
Assorted hand tools Figure 5-1-62
Dial indicator
Torque wrench - 0-135 N·m (0- 100 ft. lbs.)
BACKLASH ADJUSTMENT
NOTE: The amount of backlash is etched in
inches on the ring gear. The ring gear shown
has .014 etched as the backlash.
Backlash adjustment may vary by +/- 0.050
mm (0.002″) from the amount indicated on the
ring gear.
EXAMPLE:
Backlash on gear is 0.35 mm (0.014″)
Set backlash to 0.30 mm - 0.40 mm (0.012″ -
0.016″)
Figure 5-1-63
1. Position a dial indicator so the magnetic base
is firmly positioned on the center housing.
2. Position the plunger on one of the ring gear
teeth. The plunger should be as vertical as
possible to the gear tooth.
3. Note the dial indicator reading while moving
the ring gear backward and forward with the
pinion gear held stationary.
Figure 5-1-64
5-1-46
SECTION 5 - REAR AXLE (Rear Axle Assembly)
4. Backlash is acceptable when the dial
indicator reading is within ± 0.050 mm
(0.002″) of the amount indicated on the ring
gear.
NOTE: Proceed to the indicated step
based on the reading obtained:
• Backlash is correct. Go to step 7
• Backlash is above upper limit. Go to step 5
• Backlash is below lower limit. Go to step 6
Figure 5-1-65
5. If backlash is above the upper limit, remove
shims from the right-hand support and install
them under the left-hand support. Retorque
the support hardware to 108 N·m (80 ft. lbs.),
then repeat steps 3 and 4. 1
NOTE: Location of cast notch, 1, may vary
depending on supplier casting process.
Figure 5-1-66
6. If backlash is below the lower limit, remove
shims from the left-hand support and install
them under the right-hand support. Retorque
the support hardware to 108 N·m (80 ft. lbs.),
then repeat steps 3 and 4.
Figure 5-1-67
5-1-47
SECTION 5 - REAR AXLE (Rear Axle Assembly)
7. Perform a ring and pinion gear tooth contact
pattern check, as described in this chapter.
Figure 5-1-68
5-1-48
SECTION 5 - REAR AXLE (Rear Axle Assembly)
RING AND PINION GEAR TOOTH
CONTACT PATTERN - CHECK AND
ADJUSTMENT - ALL MODELS
The procedure to check the contact pattern is the
same for all models.
NOTE: The contact pattern for the Model
8670(A)/2145 is different from the contact
pattern for Models 8770(A)/2160,
8870(A)/2180, and 8970(A)/2210.
NOTE: Check contact pattern anytime the
differential assembly is removed or adjusted.
Improper contact pattern will result in
premature wear of the ring and pinion gears.
Tools Required:
White lead paint or equivalent
Contact Pattern Check Procedure
1. Paint the convex side, 1, of the ring gear
teeth with white lead paint or equivalent.
NOTE: Paint six teeth at three locations
approximately 120° apart.
Figure 5-1-69
2. Rotate the pinion shaft counterclockwise
while applying resistance to the rotation of
the ring gear.
NOTE: Continue to rotate the pinion shaft
until the ring gear completes three
revolutions.
Figure 5-1-70
5-1-49
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Check for acceptable contact pattern as
shown at all three locations on the ring gear.
NOTE: If the pattern is acceptable, return
to step 3 of the “Installation” section
under the “Differential and Differential
Lock Assembly - Overhaul” heading in
this chapter.
NOTE: If the pattern is not as shown,
proceed to step 4.
MODEL 8670(A)/2145 - acceptable pattern
Figure 5-1-71
MODELS 8770(A)/2160, 8870(A)/2180, and
8970(A)/2210 - acceptable pattern
Figure 5-1-72
4. If any of the unacceptable patterns are
obtained, check ring and pinion backlash and
pinion depth adjustments. Then check the
contact pattern again, starting at step 1.
IMPORTANT: An incorrect contact pattern
will result in premature wear of the ring and
pinion gears.
Figure 5-1-73
5-1-50
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DISASSEMBLY AND REPAIR
AXLE ASSEMBLY - REMOVAL AND
INSTALLATION
The Model 8670(A)/2145 axle assembly differs
from the Models 8770(A)/2160, 8870(A)/2180,
and 8970(A)/2210 assembly. The cab also
mounts differently on the two axle assemblies;
therefore, the following instructions are divided
by model numbers. Refer to the instructions for
the model to be worked on.
The following procedures detail removing the
axle assembly with the rear axle installed in the
tractor. If the rear axle is removed from the
tractor, proceed to the appropriate step.
Tools Required:
Assorted hand tools
Two pilot bolts - M16 x 160
Jack stands
Portable crane
Floor jack
Dealer-constructed tools (see “Special Tools”
heading in this chapter for details)
- Cab tilting tool - 70S001
- Axle shaft housing lifting tool - 70S002
Figure 5-1-74
REMOVAL PREPARATION-ALL MODELS
1. Thoroughly clean the area of the tractor to be
worked on.
2. Place the tractor on a level concrete surface.
3. Block both sides of the front wheels to
prevent movement.
4. Jack the tractor up and support with jack
stands.
Figure 5-1-75
5-1-51
SECTION 5 - REAR AXLE (Rear Axle Assembly)
5. Drain the oil from the rear axle by removing
drain plug, 1.
NOTE: approximately 136 Liters (36 U.S.
gallons) of oil will be drained.
6. Remove the rear wheel as detailed in Section
10, Chapter 1.
Figure 5-1-76
7. Disconnect the electrical connector, 1, on the
right rear corner of the cab.
NOTE: When removing the left trumpet
assembly, there are two electrical
connectors at the left rear of the cab that
must be disconnected.
Figure 5-1-77
8. Disconnect the wire clamp, 1; ground strap,
2; and ground wire, 3, from the inside of the
cab mount supports, 4.
NOTE: Model 8670(A)/2145 cab mount
support shown.
Figure 5-1-78
5-1-52
SECTION 5 - REAR AXLE (Rear Axle Assembly)
9. Loosen the right and left side rear cab
retaining bolts, 3.
10. Install dealer-constructed cab tilting tool
#70S001, 1, into the cab frame at 2.
NOTE: See the “Special Tools” heading
for tool dimensions.
Figure 5-1-79
11. Slowly raise the 3-point lower link arm using
a floor jack, 4, until the upper lift arms, 1, raise
the cab tilting tool, 2, enough to take the
weight off the rubber mount.
IMPORTANT: Do not raise the rear of the cab
higher than necessary to remove the rubber
insulator. Raising the rear of the cab
excessively may damage the windshield or
cab.
IMPORTANT: Do not use the tractor
hydraulic system to raise the 3-point linkage
with the cab tilting tool in place.
12. Install a jack stand, 3, under the lower lift arm
after the cab has been raised to the desired Figure 5-1-80
height.
5-1-53
SECTION 5 - REAR AXLE (Rear Axle Assembly)
AXLE ASSEMBLY REMOVAL - MODEL
8670(A)/2145
1. Complete all steps in the “Removal
Preparation - All Models” heading in this
chapter.
2. Remove the cab mount bolt and insulators.
Figure 5-1-81
3. Remove the cab support, 1, from the axle
housing.
Figure 5-1-82
4. Install dealer constructed axle lifting bracket
#70S002, 2, on the axle housing using the
second notches as shown.
NOTE: See “Special Tools” heading in
this chapter for dimensions.
5. Remove two axle attaching bolts, 1 and 3.
Figure 5-1-83
5-1-54
SECTION 5 - REAR AXLE (Rear Axle Assembly)
6. Install two pilot bolts, 1 and 2.
Figure 5-1-84
7. Remove the remaining bolts and slide the
axle assembly away from the center housing.
Lower the axle assembly to the ground.
Figure 5-1-85
INSTALLATION - MODEL 8670(A)/2145
1. Install the three locator pins, 1, in the axle
housing.
Figure 5-1-86
5-1-55
SECTION 5 - REAR AXLE (Rear Axle Assembly)
2. Thoroughly clean the center housing and
axle housing mating surfaces. Place a bead
of specified anaerobic sealer on the center
housing as shown.
Figure 5-1-87
3. Install guide bolts.
4. Use the lifting device to raise the axle into
position on the alignment pins. Slide the axle
into position.
NOTE: Place a bolt in the end of the axle
shaft and turn with a wrench to align the
planetary gears with the sun gear.
Figure 5-1-88
5. Install all rear axle attaching bolts and torque
in a cross pattern to 270 N·m (200 ft. lbs.).
NOTE: Apply specified pipe thread
sealant to the threads of bolt, 1. This bolt
is exposed to rear axle oil.
Figure 5-1-89
5-1-56
SECTION 5 - REAR AXLE (Rear Axle Assembly)
6. Install the cab support, 1, and torque the
mounting hardware to 306 N·m (226 ft. lbs.).
7. Proceed to “Final Installation Steps - All
Models” heading in this chapter.
Figure 5-1-90
AXLE ASSEMBLY REMOVAL - MODELS
8770(A)/2160, 8870(A)/2180,
8970(A)/2210
1. Complete all steps in the “Removal
Preparation - All Models” heading in this
chapter.
2. Remove the cab mount bolt and insulators.
Figure 5-1-91
3. Remove the four cab support to axle housing
attaching bolts.
4. Remove the center isolator, then attach the
cab support, 1, to the cab frame with mount
bolt.
Figure 5-1-92
5-1-57
SECTION 5 - REAR AXLE (Rear Axle Assembly)
5. Install dealer-constructed lifting bracket
#70S002, 2, on the axle housing using the
inner notches as shown.
NOTE: See “Special Tools” heading in
this chapter for dimensions.
6. Remove two axle attaching bolts, 1 and 3.
Figure 5-1-93
7. Install two pilot bolts.
Figure 5-1-94
8. Remove the remaining bolts and slide the
axle assembly, 2, and planetary ring gear, 1,
away from the center housing just enough to
install a bolt and nut, as shown in step nine.
NOTE: It may be necessary to pry the
planetary ring gear from the center
housing.
Figure 5-1-95
5-1-58
SECTION 5 - REAR AXLE (Rear Axle Assembly)
9. Secure the planetary ring gear to the axle
housing with a bolt and nut, 1.
10. Remove the axle housing and planetary ring
gear and lower to the ground.
Figure 5-1-96
INSTALLATION - MODELS 8770(A)/2160,
8870(A)/2180, 8970(A)/2210
1. Thoroughly clean the center housing and
planetary ring mating surfaces. Place a bead
of specified anaerobic sealer on the center
housing as shown.
Figure 5-1-97
2. Thoroughly clean the axle housing and
planetary ring mating surfaces. Place a bead
of specified anaerobic sealer on the axle
housing as shown. Ensure both dowel pins,
1, are installed.
Figure 5-1-98
5-1-59
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Install the planetary ring gear on the axle
housing locator pins. Use a bolt and nut, 1, to
keep the parts together during installation.
Figure 5-1-99
4. Install guide bolts, 1.
5. Use the lifting device to raise the axle into
position on the alignment pins and slide the
axle into position. Remove the bolt installed
in step 3.
NOTE: Place a bolt in the end of the axle
shaft, and turn with a wrench to align the
planetary gears with the sun gear.
Figure 5-1-100
6. Install all rear axle attaching bolts and torque
in a cross pattern to 270 N·m (200 ft. lbs.).
Figure 5-1-101
5-1-60
SECTION 5 - REAR AXLE (Rear Axle Assembly)
7. Install the cab support and torque the
mounting hardware to 239 N·m (177 ft. lbs.).
8. Proceed to “Final Installation Steps - All
Models” heading in this chapter.
Figure 5-1-102
FINAL INSTALLATION STEPS - ALL
MODELS
1. Reinstall the cab insulators and attaching
bolt.
2. Lower the 3-point lift arms to allow the cab to
sit back on the insulators.
3. Torque each of the rear cab mount bolts to
217 N·m (160 ft. lbs.).
4. Remove the cab tilting tool #70S001.
Figure 5-1-103
5. Reattach the wire harness retaining clamp,
1, the ground strap, 2, and ground wire, 3, to
the cab support mounts, 4.
NOTE: Some models have grounds
attached to the rear axle.
Figure 5-1-104
5-1-61
SECTION 5 - REAR AXLE (Rear Axle Assembly)
6. Reconnect the electrical connector, 1.
NOTE: Two connectors are used on the
left side.
7. Reinstall the rear wheel as detailed in
Section 10, Chapter 1.
Figure 5-1-105
8. Refill the rear axle assembly with specified oil
through filler tube, 1, until the oil level is to the
full mark, 3, on the dipstick, 2.
NOTE: Do not fill above the full mark.
Figure 5-1-106
5-1-62
SECTION 5 - REAR AXLE (Rear Axle Assembly)
NOTE: (70 Series) Oil seepage can occur from
the rear axle housing breather located at the
upper left-hand rear location of the rear axle
center housing. This seepage most likely occurs
while driving at higher speeds or with the PTO
operating.
To correct this problem, the rear axle housing
breather has been relocated to a boss mounted
to the top of a new oil filler tube assembly, Figure
106. This change is effective from tractor serial
#D417700. Also, at this time, the coupler drain
hose was rerouted to drain back to the former
breather location, using hose coupling elbow,
part #86018978, and new hose 90 mm (3.5“)
long, part #86018977, Figure 107. Note that this Figure 5-1-107
coupler drain is only on units equipped with the
Bruning style coupler. On earlier units equipped
with the Snap-Tite coupler, the former breather
location may be plugged, using plug, part
#236622.
5-1-63
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-108
1 Bolt lock 5 Planetary assembly 8 Axle housing 11 Oil seal ring
2 Retaining bolt 6 Inner bearing cone 9 Outer bearing cup 12 Oil seal
3 Retaining washer 7 Inner bearing cup 10 Outer bearing cone 13 Axle shaft
4 Shim(s)
AXLE HOUSING ASSEMBLY -
OVERHAUL - MODEL 8670(A)/2145
Tools Required:
Assorted hand tools
Torque wrenches
- 675 N·m (500 ft. lbs.)
- 11 N·m (100 in. lbs.)
Slide puller
Bearing puller
Bearing race puller
Bearing race driver
Bottle jack - 20 ton
Depth micrometer
Micrometer - 0 to 25 mm (0 to 1″)
Petroleum jelly Figure 5-1-109
Specified thread-locking compound
Hydraulic press
Dealer-constructed tools (see “Special Tools”
heading for details)
- Axle housing support stand - 70S020
- Planetary gear assembly lift tool - 70S007
- Axle removing tool - 70S018
- Planet ring gear removing tool - 70S019
5-1-64
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DISASSEMBLY
1. Remove the axle housing assembly as
described in this chapter.
Figure 5-1-110
2. Install eyebolts, 1, and place the axle
assembly, 2, in the dealer-constructed axle
housing stand, #70S020, 3.
Figure 5-1-111
5-1-65
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Remove separator plate, 1, from the axle
housing.
Figure 5-1-112
4. Remove bolt lock, 1.
NOTE: The bolt lock is held in place with
thread-locking adhesive.
Figure 5-1-113
5. Install eyebolts, 1; pipe, 2; and brass drift, 3,
then loosen the retaining bolt.
Figure 5-1-114
5-1-66
SECTION 5 - REAR AXLE (Rear Axle Assembly)
6. Remove axle retaining bolt, 1; retaining
washer, 2; and shims, 3.
Figure 5-1-115
7. Install the dealer-constructed planetary
assembly lifting tool #70S007, 1.
8. Lift the planetary assembly from the axle
shaft.
NOTE: If planetary repair is required, refer
to the appropriate heading in this chapter.
Figure 5-1-116
9. Install the dealer-constructed axle removing
tool #70S018, 1.
10. Place the 20-ton bottle jack, 2, on the axle
shaft and press the shaft from the bearing.
Figure 5-1-117
5-1-67
SECTION 5 - REAR AXLE (Rear Axle Assembly)
11. Remove the inner bearing from the axle
shaft.
Figure 5-1-118
12. Lift the housing from the axle shaft and place
the housing on the ground.
NOTE: Perform steps 13, 14, 15, and 16 as Figure 5-1-119
required based on parts condition.
13. Remove planetary ring gear if replacement is
required.
Install dealer-constructed removing tool
#70S019, 1. Tighten the bolts evenly to pull
the gear from the housing.
Figure 5-1-120
5-1-68
SECTION 5 - REAR AXLE (Rear Axle Assembly)
14. Remove the inner and outer bearing cups
using a slide puller with internal jaw puller.
Only remove cups if replacement is required.
Figure 5-1-121
15. Place the axle shaft in a press and remove
the outer bearing. Only remove if
replacement is required.
Figure 5-1-122
16. Press the oil seal ring from the axle shaft.
Only remove if replacement is required.
Figure 5-1-123
5-1-69
SECTION 5 - REAR AXLE (Rear Axle Assembly)
INSPECTION AND REPAIR
1. Clean all components thoroughly.
2. Inspect components for wear or damage and
replace as required.
3. Inspect oil seal ring, 1, closely. Replace if any
imperfections are found since it forms the
inner sealing surface for the axle seal, 2.
Figure 5-1-124
REASSEMBLY
Reassembly follows the disassembly process in
reverse order.
IMPORTANT: Use an induction heater, 1, or oven
to heat the bearings and oil ring seal to specified
temperature prior to installation. This allows
components to be installed with no resistance.
Components can be damaged if driven on.
Figure 5-1-125
1. Install axle shaft in axle housing stand.
2. Install oil ring seal, 2, if removed. Heat the oil
ring seal to 130° C (266° F) then install on the
axle shaft until it seats against the shaft
shoulder, 3. If needed, tap with a brass drift to
seat.
IMPORTANT: The ring seal must seat
against the shoulder.
3. Install outer bearing, 1, if removed. Heat the
outer bearing to 130° C (266° F), then install
on the shaft until it seats against the oil ring
seal, 2. If needed, tap with a brass drift to
seat.
Figure 5-1-126
IMPORTANT: The bearing must seat against
the oil ring seal.
5-1-70
SECTION 5 - REAR AXLE (Rear Axle Assembly)
4. Install three locating pins, 1, and install
planet ring gear, 2, if removed. Fully seat the
gear in the housing.
Figure 5-1-127
5. Install the inner and outer bearing cups if
removed. Use appropriate size drivers, 1.
Figure 5-1-128
6. Oil the bearing with specified oil after the
bearing has cooled.
7. Install the housing on the axle shaft.
Figure 5-1-129
5-1-71
SECTION 5 - REAR AXLE (Rear Axle Assembly)
8. Heat the inner bearing to 130° C (266° F),
then install on the shaft until it seats against
the cup. If needed, tap with a brass drift to
seat.
IMPORTANT: The bearing must seat against
the cup.
9. Oil the bearing with specified oil after the
bearing has cooled.
Figure 5-1-130
10. Install the planetary assembly on the axle
shaft. Remove the dealer-constructed lifting
tool, 1.
Figure 5-1-131
11. Install bolt, 1, and retaining washer, 2.
Tighten the bolt finger tight.
NOTE: Rear axle oil seal leak and failure
can result from loss of axle bearing
preload. If loss of axle bearing preload was
evident, inspect the axle retaining washer,
2, for bending deflection. With the washer
on a flat surface, using firm finger pressure,
press down on the outer edge of the
washer and release. If the washer “rocks”,
then it is not flat, replace with a new one
and inspect the new one the same way.
Turn the washer over and repeat this check.
Alternately, on a flat surface, use a feeler
gauge to check for 0.05 mm (0.002″)
Figure 5-1-132
maximum out of flatness. Turn the washer
over and repeat. Replace washer if there is
more than 0.050 mm (0.002″) space.
5-1-72
SECTION 5 - REAR AXLE (Rear Axle Assembly)
12. IMPORTANT: Adjust the axle shaft bearing
preload as detailed in the ”Adjustment”
heading of this chapter before proceeding.
NOTE: Do not proceed without checking
bearing preload.
Figure 5-1-133
13. Apply thread-locking compound to bolt lock.
Figure 5-1-134
14. Install bolt lock. Allow the compound to set up
and hold bolt lock, 1, in position.
Figure 5-1-135
5-1-73
SECTION 5 - REAR AXLE (Rear Axle Assembly)
15. Install separator plate, 1.
Figure 5-1-136
16. Install the axle seal as described in this
chapter.
17. Install the axle housing as described in this
chapter.
Figure 5-1-137
5-1-74
SECTION 5 - REAR AXLE (Rear Axle Assembly)
Figure 5-1-138
1 Bolt lock 5 Planetary assembly 8 Axle housing 11 Oil seal ring
2 Retaining bolt 6 Inner bearing cone 9 Outer bearing cup 12 Oil seal
3 Retaining washer 7 Inner bearing cup 10 Outer bearing cone 13 Axle shaft
4 Shim(s)
AXLE HOUSING ASSEMBLY -
OVERHAUL - MODELS 8770(A)/2160,
8870(A)/2180, 8970(A)/2210
Tools Required:
Assorted hand tools
Torque wrenches
- 675 N·m (500 ft. lbs.)
- 11 N·m (100 in. lbs.)
Slide puller
Bearing puller
Bearing race puller
Bearing race driver
Bottle jack - 20 ton
Depth micrometer Figure 5-1-139
Micrometer - 0 to 25 mm (0 to 1″)
Petroleum jelly
Specified thread-locking compound
Hydraulic press
Dealer-constructed tools (see “Special Tools”
heading for details)
- Axle housing stand - 70S020
- Planetary gear assembly lift tool - 70S008
- Axle removing tool - 70S015
- Axle rolling torque tool - 70S009
5-1-75
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DISASSEMBLY
1. Remove the axle housing assembly as
described in this chapter.
Figure 5-1-140
2. Remove planet ring gear, 2, from the axle
housing, 1.
Figure 5-1-141
5-1-76
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Install eyebolts, 1, and place axle assembly,
2, in #70S020 dealer-constructed axle
housing stand, 3.
Figure 5-1-142
4. Remove bolt lock, 1.
NOTE: The bolt lock is held in place with
thread-locking adhesive.
Figure 5-1-143
5-1-77
SECTION 5 - REAR AXLE (Rear Axle Assembly)
5. Install eyebolts, 2; pipe, 3; and brass drift, 1,
as shown, then loosen retaining bolt.
Figure 5-1-144
6. Remove axle retaining bolt, 1; retaining
washer, 2; and shims, 3.
Figure 5-1-145
7. Install dealer-constructed planetary
assembly lifting tool #70S008, 1, then attach
removable leg, 2, to the tool.
Figure 5-1-146
5-1-78
SECTION 5 - REAR AXLE (Rear Axle Assembly)
8. Lift the planetary assembly from the axle
shaft.
NOTE: If planetary repair is required, refer
to the appropriate heading in this chapter.
Figure 5-1-147
9. Install dealer-constructed axle removing tool
#70S015, 1.
10. Place 20-ton bottle jack, 2, on the axle shaft
and press the shaft from bearing, 3.
Figure 5-1-148
11. Remove inner bearing, 1, from the axle shaft.
Figure 5-1-149
5-1-79
SECTION 5 - REAR AXLE (Rear Axle Assembly)
12. Lift the housing from the axle shaft and place
the housing on the ground.
NOTE: Perform steps 13, 14, and 15 as Figure 5-1-150
required based on parts condition.
13. Remove inner and outer bearing cups using
a slide puller with internal jaw puller. Only
remove cups if replacement is required.
Figure 5-1-151
14. Place the axle shaft in a press and remove
the outer bearing. Only remove if
replacement is required.
Figure 5-1-152
5-1-80
SECTION 5 - REAR AXLE (Rear Axle Assembly)
15. Press the oil seal ring from the axle shaft.
Only remove if replacement is required.
Figure 5-1-153
INSPECTION AND REPAIR
1. Clean all components thoroughly.
2. Inspect components for wear or damage and
replace as required.
3. Inspect oil seal ring, 1, closely. Replace if any
imperfections are found since it forms the
inner sealing surface for the axle seal, 2.
Figure 5-1-154
REASSEMBLY
Reassembly follows the disassembly process in
reverse order.
IMPORTANT: Use an induction heater or oven to
heat the bearings and oil ring seal to the specified
temperature prior to installation. This allows
components to be installed with no resistance.
Components can be damaged if driven on.
Figure 5-1-155
5-1-81
SECTION 5 - REAR AXLE (Rear Axle Assembly)
1. Install the axle shaft in the axle housing
stand.
2. Install oil ring seal, 2, if removed. Heat the oil
ring seal to 130° C (266° F), then install on
the axle shaft until it seats against the shaft
shoulder, 3. If needed, tap with a brass drift to
seat.
IMPORTANT: The ring seal must seat
against the shoulder.
3. Install outer bearing, 1, if removed. Heat the
outer bearing to 130° C (266° F), then install
on the shaft until it seats against the oil ring
seal, 2. If needed, tap with a brass drift to
seat. Figure 5-1-156
IMPORTANT: The bearing must seat against
the oil ring seal.
4. Install the inner and outer bearing cups if
removed. Use appropriate size drivers, 1.
Figure 5-1-157
5. Oil the bearing with specified oil after the
bearing has cooled.
6. Install the housing on the axle shaft.
Figure 5-1-158
5-1-82
SECTION 5 - REAR AXLE (Rear Axle Assembly)
7. Heat inner bearing, 1, to 130° C (266° F),
then install on the shaft until it seats against
the cup. If needed, tap with a brass drift to
seat.
IMPORTANT: The bearing must seat against
the cup.
8. Oil the bearing with specified oil after the
bearing has cooled.
Figure 5-1-159
9. Install the planetary assembly on the axle
shaft.
Figure 5-1-160
10. Install bolt, 1, and retaining washer, 2.
Tighten the bolt finger tight.
NOTE: Rear axle oil seal leak and failure
can result from loss of axle bearing
preload. If loss of axle bearing preload was
evident, inspect the axle retaining washer,
2, for bending deflection. With the washer
on a flat surface, using firm finger pressure,
press down on the outer edge of the
washer and release. If the washer “rocks”,
then it is not flat, replace with a new one
and inspect the new one the same way.
Turn the washer over and repeat this check.
Alternately, on a flat surface, use a feeler
gauge to check for 0.05 mm (0.002″) Figure 5-1-161
maximum out of flatness. Turn the washer
over and repeat. Replace washer if there is
more than 0.050 mm (0.002″) space.
5-1-83
SECTION 5 - REAR AXLE (Rear Axle Assembly)
11. IMPORTANT: Adjust the axle shaft bearing
preload as detailed in the “Adjustment”
heading of this chapter before proceeding.
NOTE: Do not proceed without checking
bearing preload.
Figure 5-1-162
12. Apply specified thread-locking compound to
the bolt lock.
Figure 5-1-163
13. Install the bolt lock. Hold the bolt lock to the
washer, allowing the compound to set up.
Figure 5-1-164
5-1-84
SECTION 5 - REAR AXLE (Rear Axle Assembly)
14. Install the axle seal as described in this
chapter.
Figure 5-1-165
15. Install the axle housing as described in this
chapter.
Figure 5-1-166
PLANETARY OVERHAUL - ALL MODELS
The overhaul procedure is the same for the
Model 8670(A)/2145 four-planet gear assembly
and the Models 8770(A)/2160, 8870(A)/2180
and 8970(A)/2210 three-planet gear assembly.
Where components differ, the specific models
will be identified.
1. Thrust washer
2. Needle bearings (27)
3. Planet gear
4. Spacer washer
5. Needle bearings (27)
6. Thrust washer
7. Planet gear shaft
8. Lockwire Figure 5-1-167
9. Retaining ring
10. Carrier
5-1-85
SECTION 5 - REAR AXLE (Rear Axle Assembly)
MODEL 8670(A)/2145 assembly.
Figure 5-1-168
MODELS 8770(A)/2160, 8870(A)/2180,
8970(A)/2210 assembly.
Figure 5-1-169
Tools Required:
Assorted hand tools
Petroleum jelly
Dealer-constructed tools (see “Special Tools”
heading in this chapter for details)
- Needle bearing retainer - #70S012
(Model 8670(A)/2145)
- Needle bearing retainer - #70S011
(Models 8770(A)/2160, 8870(A)/2180,
8970(A)/2210)
Figure 5-1-170
5-1-86
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DISASSEMBLY
1. Cut ends from lockwire, 1, and pull from
behind retaining ring, 2.
Figure 5-1-171
2. Compress the retaining ring so it disengages
slots in planet gear shafts, 1.
Figure 5-1-172
3. MODEL 8670(A)/2145
Use #70S012 needle bearing retainer, 3, to
push shaft, 2, from planet carrier, 1. The tool
will keep the bearings in place.
Figure 5-1-173
5-1-87
SECTION 5 - REAR AXLE (Rear Axle Assembly)
4. MODELS 8770(A)/2160, 8870(A)/2180,
8970(A)/2210
Use #70S011 needle bearing retainer, 3, to
push shaft, 2, from planet carrier, 1. The tool
will keep the bearings in place.
Figure 5-1-174
5. Remove shaft, 1; planet gear, 2; and thrust
washers, 3.
6. Repeat the process and remove the
remaining planet gears.
Figure 5-1-175
7. Remove all 54 needle bearings, 2, and
center spacer, 1, from each gear.
Figure 5-1-176
5-1-88
SECTION 5 - REAR AXLE (Rear Axle Assembly)
INSPECTION
1. Clean all components thoroughly.
2. Inspect the components for wear or damage
and replace as required.
Figure 5-1-177
REASSEMBLY
Reassembly follows the disassembly procedure
in reverse.
1. Coat the needle bearings with petroleum jelly
and install one row (27) of needle bearings
around the appropriate needle bearing
retaining tool, 1.
2. Install spacer.
3. Coat and install another row (27) of needle
bearings.
Figure 5-1-178
4. Install planet gear, 2, and thrust washers, 3,
in the carrier.
5. Install gear shaft, 1, so the slotted end will be
on the retaining ring side of the carrier.
Figure 5-1-179
5-1-89
SECTION 5 - REAR AXLE (Rear Axle Assembly)
6. Push the shaft through the housing, thrust
washers, and gear.
7. Retrieve the needle bearing retaining tool.
Figure 5-1-180
8. Install retaining ring, 2, in the shaft slots.
9. Install new lockwire, 1, under the retaining
ring.
Figure 5-1-181
10. Wrap the wire end around the retainer and
trim the excess wire.
Figure 5-1-182
5-1-90
SECTION 5 - REAR AXLE (Rear Axle Assembly)
AXLE SEAL
The Model 8670(A)/2145 seal is a different style
than the seal used on Models 8770(A)/2160,
8870(A)/2180, and 8970(A)/2210 tractors.
The removal and installation procedures are the
same for all models.
Tools Required:
Slide puller with screw end
Petroleum jelly
Seal installation tool #BLR20019
Figure 5-1-183
REMOVAL
1. Remove the rear wheel as described in
Section 10.
2. Thoroughly clean the area to be worked on.
Figure 5-1-184
3. Punch small holes in the seal, 1, and use a
slide remover with a screw tip, 2, to pull the
seal from the housing.
Figure 5-1-185
5-1-91
SECTION 5 - REAR AXLE (Rear Axle Assembly)
INSPECTION
1. Clean the oil seal ring, 1, then check for wear
or damage. Replace as required.
NOTE: The oil seal ring forms the inner
sealing surface.
2. Clean the inside axle flange area, 2.
INSTALLATION
1. Put petroleum jelly on oil ring seal, 1, and
inside flange area, 2.
Figure 5-1-186
2. Position seal, 1, in place.
Figure 5-1-187
3. Thread (7/8-9 UNC) x 560 mm (24″) rod, 2, in
the end of the axle and install the axle seal
installation tool #BLR20019, 1.
4. Tighten the nut until the tool bottoms against
the housing.
Figure 5-1-188
5-1-92
SECTION 5 - REAR AXLE (Rear Axle Assembly)
5. Remove the tool and check the seal for
proper installation.
6. Reinstall the wheel as described in Section
10.
Figure 5-1-189
TOP COVER - REMOVAL AND
INSTALLATION - ALL MODELS
The top cover must be removed to perform work
on the differential or pinion assemblies.
Tools Required:
Assorted hand tools
Lifting device
REMOVAL
1. Remove the cab as described in Section 10.
2. Separate the rear axle assembly from the
transmission as described in Section 10.
NOTE: Only separate if required to
perform repairs.
Figure 5-1-190
5-1-93
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Remove the hoses and lines attached to the
remote valves if the rear axle assembly and
transmission do not require separation.
NOTE: The top cover can be removed with
the remote valve assembly attached.
4. Remove brake lines, 1 and 2, and line, 3.
5. Remove the top cover attaching hardware
and note the location as different bolt lengths
are used.
6. Remove the top cover using a lifting device.
Figure 5-1-191
INSTALLATION
Installation follows the removal procedure in
reverse order.
1. Clean the mating surfaces of the top cover
and axle center section.
2. Place a thin bead of specified silicone sealer
on the housing.
NOTE: Circle all bolt holes and oil return
hole as shown.
Figure 5-1-192
3. Install the top cover.
4. Put bolts in the original locations and torque
to 332 N·m (245 ft. lbs.).
5. Reinstall the components taken off to access
the top cover.
Figure 5-1-193
5-1-94
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL AND DIFFERENTIAL LOCK ASSEMBLY - OVERHAUL
ALL MODELS
The overhaul procedure is the same for all models.
Figure 5-1-194
1 Left-hand support 9 Left-hand side gear 18 Right-hand side gear 27 Separator plates
2 Shim(s) 10 Pinion shaft-short (2) 19 Thrust bearing 28 Spider
3 Bearing cup 11 Outer roll pin (6) 20 Washer 29 Pinion shaft
4 Bearing cone 12 Inner roll pin (6) 21 Differential lock friction discs (long)
5 Ring gear 13 Thrust washer 22 Differential lock piston 30 Right-hand
6 Differential carrier 14 Spacer-thick (4) 23 O ring (large) support
housing 15 Pinion gear (4) 24 O ring (small) 31 Shim(s)
7 Washer 16 Needle bearings (112) 25 Differential cover assy. 32 Bearing cup
8 Thrust bearing 17 Spacer-thick (4) 26 Seal rings (2) 33 Bearing cone
Tools Required:
Assorted hand tools
Torque wrenches:
- 135 N·m (100 ft. lbs.)
- 405 N·m (300 ft. lbs.)
Petroleum jelly
Bearing puller
Bearing remover
Dealer-constructed tools (see “Special Tools”
heading for details)
- Needle bearing retainer for spider gears -
#70S006
- Rear axle differential lifting tool - #70S003 Figure 5-1-195
5-1-95
SECTION 5 - REAR AXLE (Rear Axle Assembly)
REMOVAL
1. Remove the cab as described in Section 10.
NOTE: The differential assembly can be
removed without splitting the tractor.
Perform step 2 only when repairs require
access to the front of the rear axle
components.
2. Separate the rear axle assembly from the
transmission if the pinion assembly requires
repair. Refer to Section 10 for splitting
details.
3. Remove the top cover as described in this
chapter.
4. Remove both rear axle assemblies as
described in this chapter.
Figure 5-1-196
5. Remove the PTO assembly and PTO input
shaft as described in Section 7.
Figure 5-1-197
5-1-96
SECTION 5 - REAR AXLE (Rear Axle Assembly)
NOTE: If the rear axle assembly is
separate from the transmission, pull the
PTO input shaft out as shown.
Figure 5-1-198
6. Remove the differential lock hydraulic line, 1,
and adaptor from the right-hand differential
support, 2.
Figure 5-1-199
7. Install #70S003 dealer-constructed
differential lifting tool, 1. Use a suitable lifting
device to support the differential.
Figure 5-1-200
5-1-97
SECTION 5 - REAR AXLE (Rear Axle Assembly)
8. Remove the retaining bolts from the
right-hand differential support.
Figure 5-1-201
9. Remove the support and shims and keep
them together.
Figure 5-1-202
10. Remove the left-hand support and shims and
keep them together.
Figure 5-1-203
5-1-98
SECTION 5 - REAR AXLE (Rear Axle Assembly)
11. Lift the differential assembly from the center
housing.
Figure 5-1-204
DISASSEMBLY
1. Mark the position of the components.
Figure 5-1-205
2. Remove the retaining bolts.
Figure 5-1-206
5-1-99
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Remove ring gear, 1, from housing, 2.
Figure 5-1-207
4. Separate the cover, 1, from the housing, 2, by
applying compressed air through the oil hole
in the cover.
5. Remove the cover.
Figure 5-1-208
6. Remove piston, 1.
Figure 5-1-209
5-1-100
SECTION 5 - REAR AXLE (Rear Axle Assembly)
7. Remove separator plates, 3, and friction
discs, 2, from the right-hand side gear, 1.
NOTE: The separator plate is against the
piston.
Figure 5-1-210
8. Remove thrust bearing, 1, and washer, 2,
from the right-hand side gear, 3.
Figure 5-1-211
9. Remove the right side gear.
Figure 5-1-212
5-1-101
SECTION 5 - REAR AXLE (Rear Axle Assembly)
10. Drive the inner and outer roll pins from three
pinion shafts.
Figure 5-1-213
11. Remove the long pinion shaft from one pinion
gear.
12. Remove pinion gear, 1; spacer, 3; and thrust
washer, 2.
13. Remove the remaining pinion gears using
the same process.
14. Remove spider, 4.
Figure 5-1-214
15. Remove spacer, 1; twenty-eight needle
bearings, 3; and spacer, 4, from each gear, 2.
Figure 5-1-215
5-1-102
SECTION 5 - REAR AXLE (Rear Axle Assembly)
16. Remove the left-hand side gear, 3; thrust
bearing, 2; and washer, 1, from the housing.
Figure 5-1-216
INSPECTION AND REPAIR
1. Clean all components thoroughly.
2. Inspect the components for wear or damage
and replace as required.
IMPORTANT: The ring and pinion gears are
a matched set. If the ring gear is replaced, the
matched pinion must be installed as
described in this chapter.
Figure 5-1-217
3. Replace outer, 1, and inner, 2, piston O rings.
Figure 5-1-218
5-1-103
SECTION 5 - REAR AXLE (Rear Axle Assembly)
4. Replace damaged bearings using a suitable
bearing puller.
CAUTION: THE PULLER MUST BE
PULLED AGAINST THE INNER RACE. DO
NOT ALLOW THE PULLER TO PULL
AGAINST ROLLERS, OR CAGE, AS THE
BEARINGS MAY SEPARATE.
Figure 5-1-219
5. Press new bearings in place using an
appropriate step plate or sleeve.
6. Inspect seal rings, 1, on the cover assembly
and replace if damaged.
Figure 5-1-220
7. Inspect inner sealing area, 1, on the
right-hand support. Replace if worn or
damaged.
8. Replace damaged bearing cups, 2.
Figure 5-1-221
5-1-104
SECTION 5 - REAR AXLE (Rear Axle Assembly)
REASSEMBLY
Reassembly follows the disassembly process in
reverse order.
Observe the following during reassembly.
Lubricate the components with specified oil
during reassembly.
1. Coat washer, 1, and thrust bearing, 2, with
petroleum jelly and install on gear, 3.
2. Install the gear in the housing.
Figure 5-1-222
3. Install thick spacer, 1, in the gear.
Figure 5-1-223
4. Insert needle bearing retaining tool
#70S006, 1, in the gear.
Figure 5-1-224
5-1-105
SECTION 5 - REAR AXLE (Rear Axle Assembly)
5. Coat 28 needle bearings with petroleum jelly
and install.
Figure 5-1-225
6. Coat the rear of washer, 1, and install in the
housing.
Figure 5-1-226
7. Place gear, 1, in place and insert pinion shaft,
2, through the housing and gear. Retrieve the
needle bearing retaining tool, 3, from the
gear as the shaft enters the gear.
IMPORTANT: Install the pinion shaft so the
holes in the shaft align with the roll pin holes
in the housing.
Figure 5-1-227
5-1-106
SECTION 5 - REAR AXLE (Rear Axle Assembly)
8. Install the remaining gears and shafts.
9. Insert spider, 1.
10. Install spacer, 2, between each gear and
spider, then push the shaft into the spider.
Figure 5-1-228
11. Install the outer and inner roll pins through
the housing and shafts.
Figure 5-1-229
12. Coat the O rings with petroleum jelly.
13. Install the piston in the cover and fully seat in
the cover.
Figure 5-1-230
5-1-107
SECTION 5 - REAR AXLE (Rear Axle Assembly)
14. Install separator plate, 1, against the piston.
Place the tabs on the separator plate in slots
in the cover.
Figure 5-1-231
15. Install the remaining friction discs and
separator plates in an alternate fashion.
IMPORTANT: Soak new friction discs in
specified oil for ten minutes before
installation.
Figure 5-1-232
16. Coat washer, 1, and thrust bearing, 2, with
petroleum jelly, then install on the right-hand
side gear, 3.
Figure 5-1-233
5-1-108
SECTION 5 - REAR AXLE (Rear Axle Assembly)
17. Install the side gear in the clutch plates. Make
sure the gear is fully seated.
Figure 5-1-234
18. Install housing, 1, on cover assembly, 3.
19. Insert two bolts and nuts, 2.
Figure 5-1-235
20. Tighten the bolts evenly until the cover and
housing come together, then remove the
bolts.
NOTE: Make sure the gears are aligned
before tightening the bolts.
Figure 5-1-236
5-1-109
SECTION 5 - REAR AXLE (Rear Axle Assembly)
21. Install the ring gear and torque the hardware
to 338 N·m (250 ft. lbs.).
Figure 5-1-237
INSTALLATION
Installation follows the removal procedure in
reverse order.
1. Lower the differential assembly into the rear
axle housing.
Figure 5-1-238
2. Check and adjust the differential support
bearing preload and pinion backlash as
detailed in the “Adjustment” heading in this
chapter.
IMPORTANT: Do not proceed without
checking bearing preload and backlash.
Figure 5-1-239
5-1-110
SECTION 5 - REAR AXLE (Rear Axle Assembly)
3. Install and tighten the differential hydraulic
line and adaptor, 1, to the retainer, 2.
4. Reassemble the tractor components
removed to access the differential assembly.
Figure 5-1-240
5-1-111
SECTION 5 - REAR AXLE (Rear Axle Assembly)
PINION ASSEMBLY OVERHAUL
ALL MODELS
The overhaul procedure is the same for all models.
Figure 5-1-241
1 Pinion gear 4 Shim (3) 7 Lock washer 10 Bearing cup (front)
2 Bearing cone (rear) 5 Park brake disc (3) 8 Adjusting nut 11 Pinion sleeve
3 Bearing cup (rear) 6 Jam nut 9 Bearing cone (front)
The Model 8670(A)/2145 pinion assembly uses
different size components than Models
8770(A)/2160, 8870(A)/2180, and 8970(A)/2210
pinion assemblies.
Tools Required:
Assorted hand tools
Hydraulic press
Portable hydraulic pump and ram
Pinion nut spanner tool BLR20021
Induction heater or heating oven
Dealer-constructed tools (See “Special Tools”
heading for details)
- Pinion rotating tool - 70S005
- Pinion removal plate - 70S013
Figure 5-1-242
5-1-112
SECTION 5 - REAR AXLE (Rear Axle Assembly)
REMOVAL
1. Remove the cab and separate the rear axle
housing from the transmission as described
in Section 10.
2. Remove the differential assembly as
described in this chapter.
Figure 5-1-243
3. Remove the hydraulic pump drive as
described in Section 8.
Figure 5-1-244
5-1-113
SECTION 5 - REAR AXLE (Rear Axle Assembly)
4. Remove the park brake actuator as
described in Section 6.
Figure 5-1-245
5. Remove the Four Wheel Drive (FWD) clutch
if equipped. Refer to Section 9.
Figure 5-1-246
6. Remove the FWD drive gear, 1, if equipped,
by removing snap ring, 3, and shims, 2.
NOTE: FWD gear, 1, is not installed on
2WD models.
Figure 5-1-247
5-1-114
SECTION 5 - REAR AXLE (Rear Axle Assembly)
7. Slide FWD drive gear, 1, from pinion shaft, 2.
Figure 5-1-248
8. Straighten lock tabs, 1, on the lock washer.
Figure 5-1-249
9. Install special tool BLR20021, 1, on jam nut
and dealer-made pinion rotating tool
#70S005, 2.
Figure 5-1-250
5-1-115
SECTION 5 - REAR AXLE (Rear Axle Assembly)
10. Loosen jam nut.
Figure 5-1-251
11. Remove jam nut, 2; lock washer, 1; and
adjusting nut, 3.
Figure 5-1-252
12. Place a block of wood in the housing to
prevent damage to the housing and pinion
gear when it is pressed from the bearings.
Figure 5-1-253
5-1-116
SECTION 5 - REAR AXLE (Rear Axle Assembly)
13. Install the dealer-made pinion removal plate
#70S013, 1, on the housing.
Figure 5-1-254
14. Install a hydraulic ram, 1, between the pinion
shaft and pinion removal plate tool, 2.
Figure 5-1-255
15. Press the pinion shaft from the front bearing.
16. Remove the pinion from the housing.
Figure 5-1-256
5-1-117
SECTION 5 - REAR AXLE (Rear Axle Assembly)
17. Remove the three park brake discs from the
housing.
NOTE: Perform steps 18, 19, 20 and 21 as
required based on parts condition. Step Figure 5-1-257
20 is required when replacing pinion
shaft or rear pinion bearing.
18. Drive the pinion sleeve, 1, from the housing
using a brass drift.
Figure 5-1-258
19. Drive the front bearing cup, 2, from sleeve, 1,
with a brass drift.
Figure 5-1-259
5-1-118
SECTION 5 - REAR AXLE (Rear Axle Assembly)
20. Drive the rear pinion cup and shims, 1, from
the housing using a brass drift. Retain the
shims for reference or reuse if not damaged.
Figure 5-1-260
21. Press the rear bearing from the pinion shaft.
Figure 5-1-261
5-1-119
SECTION 5 - REAR AXLE (Rear Axle Assembly)
INSPECTION AND REPAIR
1. Clean all components thoroughly.
2. Inspect the components for wear or damage
and replace as required.
Figure 5-1-262
IMPORTANT: The ring and pinion gears are
a matched set. If the pinion gear is replaced,
the matched ring gear must be installed as
described in this chapter.
REASSEMBLY
Reassembly follows the disassembly process in
reverse order.
Observe the following during reassembly.
Figure 5-1-263
Lubricate the components with specified oil
during reassembly.
IMPORTANT: Use an induction heater or oven to
heat the bearings to specified temperature prior
to installation. This allows the bearings to be
installed with no resistance. Components can be
damaged if the bearings are driven on.
IMPORTANT: Start at step 1 if any of the
following were done:
• The rear pinion bearing cup was removed
or replaced.
• The rear pinion bearing was removed or
replaced.
• The pinion gear and ring gear were
replaced.
Figure 5-1-264
• The center housing was replaced.
Start at step 3 if none of the above were done.
5-1-120
SECTION 5 - REAR AXLE (Rear Axle Assembly)
1. Determine the pinion depth adjustment shim
pack thickness as described in the
“Adjustment” portion of this chapter. This will
provide the correct engagement of the ring
and pinion gears.
IMPORTANT: Failure to adjust the pinion
depth properly will result in improper ring and
pinion gear engagement and premature
failure of the components. Do not proceed
without completing this adjustment.
Figure 5-1-265
2. Install a new rear bearing on the pinion shaft
if the bearing was removed or a new pinion is
being installed.
Heat the bearing to 140° C (280° F) then
install on the shaft until fully seated.
IMPORTANT: The bearing must fully bottom
on the shaft.
Figure 5-1-266
3. Install the correct shim pack, 1, in the
housing.
NOTE: This shim pack will determine the
engagement of the ring and pinion gears.
4. Install the bearing cup using a driver that
corresponds to the outside diameter of the
cup.
Figure 5-1-267
5-1-121
SECTION 5 - REAR AXLE (Rear Axle Assembly)
5. Install the front bearing cup, 2, in sleeve, 1, if
removed. Use a driver that corresponds to
the outside diameter of the cup.
Figure 5-1-268
6. Install sleeve, 1, in the center housing if
removed. Use a driver that corresponds to
the lip on the sleeve.
Figure 5-1-269
7. Install park brake discs in the housing if
removed.
IMPORTANT: Install the discs on the pinion
shaft so the oil holes in the three discs are
staggered. Failure to stagger the holes will
result in premature wear of the park brake
components.
IMPORTANT: The discs should slide freely
on the pinion shaft. Correct binding if
encountered. Binding will result in premature
wear of the park brake components.
Figure 5-1-270
5-1-122
SECTION 5 - REAR AXLE (Rear Axle Assembly)
8. Install the pinion assembly and hold it in
place with a jack and wood blocks.
IMPORTANT: Ensure that the park brake
discs are installed as described in step 7.
Figure 5-1-271
9. Heat the front bearing in an oven or induction
heater to 140° C (280° F), then install on the
shaft until fully seated in the bearing cup.
Allow the bearing to cool before proceeding.
Figure 5-1-272
10. Install adjustment nut, 1, hand tight.
NOTE: The wide side of the nut must
contact the bearings.
Figure 5-1-273
5-1-123
SECTION 5 - REAR AXLE (Rear Axle Assembly)
11. Adjust the pinion bearing preload as
described in the “Adjustment” heading in this
chapter.
IMPORTANT: Failure to adjust the pinion
bearing preload will result in premature
failure of the rear axle components. Do not
proceed without completing this adjustment.
Figure 5-1-274
12. Adjust ring and pinion gear backlash as
described in the “Adjustment” heading in this
chapter.
IMPORTANT: Failure to adjust ring and
pinion gear backlash will result in premature
failure of rear axle components. Do not
proceed without completing this adjustment.
Figure 5-1-275
13. Install FWD gear, 1, if equipped.
14. Install shims, 2, as required, to eliminate gear
end play with snap ring, 3, installed.
15. Reassemble the tractor components
removed to access the pinion assembly.
Figure 5-1-276
5-1-124
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL LOCK SOLENOID
NOTE: The solenoid can be serviced on the
tractor.
Tools Required:
Assorted hand tools
Torque wrench: 0-135 N·m (0-100 ft. lbs.)
Ohmmeter
Figure 5-1-277
Removal
1. Remove the solenoid coil retaining nut, 2,
and coil, 1.
2. Unscrew the solenoid body from the housing.
Figure 5-1-278
Inspection and Repair
1. Inspect and replace damaged parts.
Figure 5-1-279
5-1-125
SECTION 5 - REAR AXLE (Rear Axle Assembly)
2. Perform a continuity check on the coil.
Resistance should be approximately 9.4
ohms. Replace the coil if defective.
Figure 5-1-280
3. Install the coil on the solenoid body. When
the coil has no voltage, air pressure directed
in hole, 1, should exit at holes, 2, but not
through holes under screen, 3. Replace the
solenoid if defective.
4. With the coil installed on the solenoid body,
use a 12-volt supply to energize the coil.
Air pressure directed in hole, 1, should exit
holes, 2, and through holes under screen, 3.
Replace the solenoid if defective.
Figure 5-1-281
Reassembly
Reassembly follows disassembly in reverse.
1. Coat O rings, 3, with petroleum jelly. Install
solenoid body, 2, and torque to 27 N·m (20 ft.
lbs.).
2. Install coil, 1, and tighten nut to 7 N·m (5 ft.
lbs.).
Figure 5-1-282
5-1-126
SECTION 5 - REAR AXLE (Rear Axle Assembly)
DIFFERENTIAL LOCK SYSTEM PRESSURE TESTING
INTRODUCTION
A quick-release coupler, 1, is provided to
pressure test the differential lock circuit.
The coupler is located at the rear of the tractor on
the PTO housing. The housing is labeled to
identify the coupler.
Figure 5-1-283
(70A/2000 Series)
To operate the front axle diff. lock, a new
hydraulic line, 1, has been added from the test
port on the rear differential, along the left-hand
side of the tractor, to the front differential. You will
use this one test port, 2, to check pressure for
both the front and rear differentials.
Figure 5-1-284
Figure 5-1-285
5-1-127
SECTION 5 - REAR AXLE (Rear Axle Assembly)
PRE-TEST PREPARATION
1. Install PD female coupler special tool
BLR20011 on all gauge hose ends used for
testing.
2. Warm the oil to a minimum of 60° C (140° F).
3. Perform tests with the engine operating at
1900 RPM, then repeat at 1200 RPM.
4. Perform a pressure test on the low pressure
regulating circuit by installing a 4140 kPa
(600 PSI) gauge on coupler, 2, located on the
transmission valve, 1.
Pressure should be 1655 kPa -1862 kPa
(240 PSI - 270 PSI). Figure 5-1-286
NOTE: If pressure is out of specification,
repair the low-pressure regulating circuit
before continuing.
5-1-128
SECTION 5 - REAR AXLE (Rear Axle Assembly)
CIRCUIT PRESSURE TEST
This test checks the differential lock apply
pressure.
When clutch apply pressure is present, the
differential lock is applied.
When apply pressure is not present, the
differential lock is not engaged.
Apply pressure should be 1655 kPa - 1862 kPa
(240 PSI - 270 PSI) when the diff-lock is
activated.
0 kPa (0 PSI) when the differential lock is not
activated.
Test Procedure
1. Complete pre-test items.
2. Connect a 4140 kPa (600 PSI) gauge to
coupler, 1.
3. Start the engine and operate at 1900 RPM.
4. Record the pressure with the differential lock
not activated.
5. Record pressure with the differential lock
activated.
6. Repeat steps four and five with the engine at
1200 RPM and compare to the original
readings.
Figure 5-1-287
7. If pressure is out of specified range, refer to
the “Troubleshooting” heading in this
chapter.
5-1-129
SECTION 5 - REAR AXLE (Rear Axle Assembly)
INDEX
70 series differential lock control system Differential carrier . . . . . . . . . . . . . . . . . . . . . 5-1-4
operation Differential lock electrical circuit operation 5-1-9
Automatic operation . . . . . . . . . . . . . . . . 5-1-7 Differential lock hydraulic circuit operation 5-1-11
Normal operation . . . . . . . . . . . . . . . . . . 5-1-7 Differential lock mechanical operation . . . . 5-1-6
70A/2000 series differential lock control Differential lock solenoid . . . . . . . . . . . . . . . 5-1-125
system operation . . . . . . . . . . . . . . . . . . . . 5-1-8 Inspection and repair . . . . . . . . . . . . . . . 5-1-125
Engaging and disengaging Reassembly . . . . . . . . . . . . . . . . . . . . . . . 5-1-126
differential lock . . . . . . . . . . . . . . . . . . . 5-1-8 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-125
Axle assembly -- removal and installation . 5-1-51 Differential lock system pressure testing
Final installation steps . . . . . . . . . . . . . . 5-1-61 Circuit pressure test . . . . . . . . . . . . . . . . 5-1-129
Installation -- Model 2145, 8670(A) . . . 5-1-55 Pre-test preparation . . . . . . . . . . . . . . . . 5-1-128
Installation -- Models 2160, 8770(A), Differential support bearings preload
2180, 8870(A), and 2210, 8970(A) . . 5-1-59 adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-43
Removal -- Model 2145, 8670(A) . . . . . 5-1-54 Engaging or disengaging the differential lock
Removal -- Models 2160, 8770(A), in either the automatic mode or
2180, 8870(A), and 2210, 8970(A) . . 5-1-57 the TCS mode . . . . . . . . . . . . . . . . . . . . . . . 5-1-8
Removal preparation . . . . . . . . . . . . . . . 5-1-51 Final reduction drive . . . . . . . . . . . . . . . . . . . 5-1-5
Axle housing assembly -- overhaul -- Front axle differential line . . . . . . . . . . . . . . . 5-1-11
Model 2145, 8670(A) . . . . . . . . . . . . . . . . . 5-1-64 Pinion and ring gear . . . . . . . . . . . . . . . . . . . 5-1-3
Disassembly . . . . . . . . . . . . . . . . . . . . . . 5-1-65 Pinion assembly overhaul . . . . . . . . . . . . . . 5-1-112
Inspection and repair . . . . . . . . . . . . . . . 5-1-70 Inspection and repair . . . . . . . . . . . . . . . 5-1-120
Reassembly . . . . . . . . . . . . . . . . . . . . . . . 5-1-70 Reassembly . . . . . . . . . . . . . . . . . . . . . . . 5-1-120
Axle housing assembly -- overhaul -- Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-113
Model 2160, 8770(A), 2180, 8870(A), Pinion bearing preload adjustment . . . . . . . 5-1-40
and 2210, 8970(A) . . . . . . . . . . . . . . . . . . . 5-1-75 Pinion depth adjustment . . . . . . . . . . . . . . . . 5-1-35
Disassembly . . . . . . . . . . . . . . . . . . . . . . 5-1-76 Planetary overhaul . . . . . . . . . . . . . . . . . . . . 5-1-85
Inspection and repair . . . . . . . . . . . . . . . 5-1-81 Disassembly . . . . . . . . . . . . . . . . . . . . . . 5-1-87
Reassembly . . . . . . . . . . . . . . . . . . . . . . . 5-1-81 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-89
Axle seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-91 Reassembly . . . . . . . . . . . . . . . . . . . . . . . 5-1-89
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-92 Ring and pinion gear backlash adjustment 5-1-46
Installation . . . . . . . . . . . . . . . . . . . . . . . . 5-1-91 Ring and pinion gear tooth contact pattern --
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-91 check and procedure . . . . . . . . . . . . . . . . . 5-1-49
Axle shaft bearing preload adjustment . . . . 5-1-30 Special tools . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-23
Dealer constructed special tools . . . . . . . . . 5-1-24 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-22
Description of operation . . . . . . . . . . . . . . . . 5-1-2 Top cover -- removal and installation . . . . . 5-1-93
Differential and differential lock assembly -- Installation . . . . . . . . . . . . . . . . . . . . . . . . 5-1-93
overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-95 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-93
Disassembly . . . . . . . . . . . . . . . . . . . . . . 5-1-99 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . 5-1-13
Inspection and repair . . . . . . . . . . . . . . . 5-1-103
Installation . . . . . . . . . . . . . . . . . . . . . . . . 5-1-110
Reassembly . . . . . . . . . . . . . . . . . . . . . . . 5-1-105
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1-96
5-1-130
Buhler Versatile Inc.
Box 7300, 1260 Clarence Ave Buhler Versatile Inc., Winnipeg, MB
Winnipeg, Manitoba R3C 4E8 Printed in Canada