JBA RHS THUMB
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OPERATIONS MANUAL
JBA RHS THUMB
INTRODUCTION
Thanks for choosing from JB Attachments range of earthmoving products. The contents of this
manual should be thoroughly read and understood by the operators and / or installers of our
products, to ensure safe and trouble free use.
This manual is intended to provide instruction for installation, use and warranty of the JB
Attachments RHS Thumb, Claw and other associated products.
For the purposes of simplicity the JB Attachments “Claw” is refered to as “Thumb” within the
manual.
JB Attachments
49 McLaughlins Rd
Wiri, Manukau 2104
PO Box 98979
Manukau City, Manukau 2241
Ph: 09 278 4863
Fax: 09 278 4864
www.jbattachments.com
sales@jbattachments.com
CONTENTS:
ATTACHMENT OF YOUR THUMB TO AN EXCAVATOR 2
GENERAL MAINTENANCE AND SERVICING OF YOUR THUMB 4
GENERAL GUIDELINES FOR HYDRAULIC FITMENT FOR YOUR THUMB 5
THUMB OPERATION 6
USE OF YOUR THUMB 8
WARRANTY 9
Page 1
ATTACHMENT OF YOUR RHS THUMB TO AN EXCAVATOR
1. Check existing dipper surface for doubler plates / wear bars.
• Some machines have a doubler plate: You may need to extend the doubler plate to ensure
a good weld all around the end of the Thumb mount plate. The doubler should be wider
than the Thumb baseplate by 8-10mm to allow a good fillet weld (see point 3 for a sizing
suggestion).
• Some machines have wear bars: You will need to remove these and grind the area smooth
in order for the Thumb to sit flat on the dipper.
1:1 1:2
Doubler
Wear
Bars
1:3
Doubler
Extension
2. Width Adjustment
Since different machines have different dipper widths the mount plate provided is made to the
widest known dipper width. This means that the baseplate may need to be trimmed in width.
• The welds running down the side of the thumb should line up with the welds on the dipper
arm.
• Depending on your machine you may need to trim the sides of the mount plate to:
• Line up with the welds of the dipper arm top to side, or
• To fit approximately 8-10mm within any doubler or extension welded to dipper.
2:1
Dipper Arm
Side to Top
Weld
8-10mm
Offset to
Doubler
Page 2
3. Setout of Thumb
• Put the attachment with the greatest forward stick out on the machine / hitch and crowd all
the way around (see diagram 3:1).
• Set out so the closest point of the Thumb is no more than 50-100mm to the closest point of
the equipment on the dipper (See 3:2) this will allow you to measure the distance you will
need to increase the doubler by at the other end.
3:1 3:2
Forward
Stick
Out
Closest
50mm to
Point
Closest
Point
4. Welding
No welding should be done straight across the dipper as this can cause the dipper arm
to crack along that line. Always curve plates running across the dipper arm.
• Grind all surfaces that will be welded before welding.
• The welds should be a well penetrated fillet of approximately 8-10mm all around.
• Ensure to weld the baseplate to the dipper inside all plug welds provided.
4:1
Aim for an
8-10mm
fillet weld
Area is
ground to
bare metal
Page 3
GENERAL MAINTENANCE AND SERVICING OF YOUR RHS THUMB
DAILY MAINTENANCE
• Grease all grease points twice daily (see greasing tips).
• Remove solid materials, stones etc from around moving parts.
• Check hoses and fittings for signs of leak or wear.
• Check all pin retainer bolts and nuts for tightness.
• Check hydraulic cylinder mounting bolts for tightness.
• Check for damage and cracks.
GREASING TIPS
• Greasing must be carried out twice daily! We recommend before starting work, and before
restarting after lunch.
• Check your product for the relevant location of grease nipples before operating the unit.
• Products that have rotating components usually have bush tubes with hard bushes
(Tilt Hitch / Tilt Bucket pivot tubes, Grab pivot tubes, Thumb base etc.). These are greased in
one of two ways:
• If access allows these are greased through nipples on the side of each end of the tube.
• Greasable pins: Grease is applied through the centre of the pivot pin usually at both
ends if accessible.
• Tilting ram eyes, Thumb ram eyes and stays usually have grease applied to the tilting
surfaces through only one nipple in each bush.
Pivot tube greased through bush -
Normally one on each end
Pivot tube greased through pin -
Usually one on each end
Ram greased through eye
Page 4
GENERAL GUIDELINES FOR HYDRAULIC FITMENT YOUR RHS THUMB
Before you begin plumbing installation, please ensure you understand the following:
• All the hoses and fittings used should be rated for at least 345 Bar (5000psi) preferably use
two braided hoses.
• Hydraulic hoses should follow the paths of existing hydraulic lines of the machine.
• Hydraulic hoses should only be long enough to accomplish their intended function whilst
ensuring that under any operating position they have a radius greater than 100mm.
• Do not weld mounting brackets across the steels rolling induced grain. If using a junction
block this should be placed as close as possible to the unit, to reduce the amount of excess
hose.
• When the ram is at full stroke, the hoses to the junction block should be long enough that
they are not under any tension due to the crowd ram action.Please make sure you test in
both directions.
• We recommend that the main pump circuit (eg, dipper ram hydraulic pump test port) be used
as a source of hydraulic pressure. Position and fasten the solenoid valve as close to the
chosen pump as possible.
HYDRAULIC PRESSURE GUIDELINES FOR THUMBS
• Ensure that the operating hydraulic pressure is between 103-120 Bar (1500-1750psi).
Pressures lower than 103 Bar (1500Psi) may not effectively clamp, however operation
above 120 Bar (1750psi) may cause damage to the ram. Operating the unit outside these
parameters will void the warranty.
Note: It is recommended that the pressure relief valve be fitted as close to the ram as is safely
possible to help avoid spiking.
Page 5
Page 6
THUMB OPERATION
THUMB OPERATION CONTINUED
Page 7
USE OF THE JB THUMB
The BAS Thumb and Claw are designed to hold a load against a suitable bucket or ripper.
• Do Not exert load on the back of the Thumb (Eg: Do Not Pull anything towards the cab with the Thumb).
• Do Not exert load on the side of the Thumb (Eg: Do Not Slew).
• Do Not pull stumps or other items out of the ground with the Thumb.
• Do Not use with items longer than the machine width.
• Always ensure that any tilting hitches or buckets are locked in a horizontal position and cannot creep
or tilt before using the Thumb
• Always ensure that the centre of gravity of the load is in line with the centre of the dipper and
Thumb.
• Always lock the Thumb into its parked position with the manual locking pin when the Thumb is not in
use.
• Always ensure that the ram and base are free from dirt or debris when extending or retracting the
Thumb.
• Always ensure that any people or property are well clear of your work area.
!! WARNING !!
Failure to follow the above instructions may result in serious injury or death,
may cause undue wear on the unit and will void all warranties.
NOTES
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Page 8
WARRANTY
New equipment sold by JB Attachments is warranted to be free from manufacturing and
materials defects in normal service for a period of ninety days from the date of purchase by the
original purchaser.
JB Attachments obligation under this warranty is limited to the replacement or repair of such
part or parts as shall appear to JB Attachments upon inspection at point of manufacture or JB
Attachments dealer or authorised service establishment to have been defective in materials
and/or JB Attachments workmanship only. Parts for which warranty relief is claimed must be
returned for inspection in a clean and workable condition.
This warranty does not cover defects attributable to causes or occurrences beyond JB
Attachments control and unrelated to the manufacturing process, including, but not limited to,
abuse, misuse, mishandling, neglect (including failure to provide reasonable maintenance while
in the possession of the consumer), improper installation, any alteration to the part or other part
used in conjunction with a part manufactured by JB Attachments or improper application.
The foregoing express warranties are in lieu of all other warranties, expressed or implied,
written or oral. JB Attachments disclaim all other warranties, including, without limitation, the
implied warranties of merchantability and fitness for a particular purpose. In no event shall JB
Attachmentsd be liable for incidental, economic or consequential loss, damages, claims or costs
of any kind whatsoever including, but not limited to, loss of machine productivity in connection
with the defective materials and/or workmanship or with the replacement or repair of any
defective part.
This warranty card must be completed upon purchase and must be shown to a JB dealer or
authorised service establishment, when making any claim.
JB Attachments
Serial No. _____________________________ Date of Purchase ______________________
Purchaser __________________________________________________________________
Dealer _____________________________________________________________________
This warranty applies only to BAS equipment purchased in New Zealand.
© JB Attachments 2009
Page 9
JB Attachments
49 McLaughlins Rd
Wiri, Auckland
PO Box 98979
South Auckland Mail Centre, Auckland
Ph: 09 278 4863
Fax: 09 278 4864
www.jbattachments.com
sales@jbattachments.com
