Error flow chart Hub Unit

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					Error flow chart Hub Unit “Grease Leakage”
Troubleshooting for Problems on All or Individual Wheels of the Trailer / Semi-trailer

                                                               Hub unit
                                                           grease leakage?



                                                        Grease leakage checked
                                                           to SAF-HOLLAND
                                                             specifications?

                                                          Yes             No


     Grease leakage >                                                                                                   Check to
   SAF-HOLLAND specs?                                                                                              SAF-HOLLAND specs!

     Yes             No

                                                                                                 Check for noise


   Clearance of
   brake calliper
       OK?                                                                                        Noise heard
                                                                                                     within
  Yes        No                                                                                  SAF-HOLLAND
                                     Check brake                                                 specifications?
                                    calliper adjuster
                                                                                                 Yes       No
  Seal elements
 of brake calliper                                        Replace brake                                                     Check wheel bearing
   guides OK?                                                calliper                                                              play


  Yes        No           Replace seal                                                Replace
                          elements and                                                Hub unit                                Bearing play >
                          calliper guides                                                                                  SAF-HOLLAND specs?
                                                                                         End
                                                                                                                              Yes              No

     Trailer
  equipped with
      EBS?                                                                    Trailer braking                Replace
                                                                              brake protocol                 Hub unit
  Yes        No                                                                    OK?                                                Hub unit OK
                                                                                                                   End
                                     LSV OK?                                                                                                 END
                                                                              No         Yes
   TEBS failure
   protocol OK?                   Yes        No
                                                                                                                            Tractor/trailer
                                                                              Replace                                        synch. OK?
   No        Yes                                                              Hub unit
                                   Trailer brake                                                                            Yes        No
                                  valve function/                               End
                                   setting OK?

   Repair TEBS                    Yes        No                                                                              Trailer/semi-
  system acc. to                                         Inspect, adjust or                                                   trailer OK?
  manufacturer’s                                         repair parts to
  specifications                                         manufacturer’s                                                     Yes        No
                                                         specs, or replace


                                                                                                                           Check dynamic
                                                                                                                           pre dominance
                                                                                                                            and adjust, if
                                                                                                                             necessary
                                                            Replace
                                                            Hub unit

 This sheet is intended merely as an aid to troubleshooting. Depending on the brake system version, differences are possible.
 SAF-HOLLAND can therefore assume no liability for correctness. Repairs to the brake system may only be carried out by authorised
 personnel.

SAF-HOLLAND GmbH • Hauptstraße 26 • D-63856 Bessenbach
Tel.: +49 (0) 6095 / 301 - 602 • Fax: +49 (0) 6095 / 301 - 259 • service@safholland.de • www.safholland.com                              11.2009
Error flow chart Hub Unit “Noice“

Troubleshooting for Problems on All or Individual Wheels of the Trailer/ Semi-trailer

                                                          Hub Unit
                                                           Noise?


   Noise heard                                                                         Clearance of
      within                                                                           brake calliper
  SAF-HOLLAND                                                                              OK.?
     specs?                  Remove Pads
                                                                                       Yes       No                  Check brake
  Yes        No                                                                                                     calliper adjuster

                                                       Check Leakage                      Grease
                                                                                         Leakage
                                                                                       SAF-HOLLAND
  Seal elements                                                                           specs?                     Replace brake
 of brake calliper                                                                                                      calliper
   guides OK?                                                                          Yes        No


  Yes        No               Replace seal                Replace                                                       Replace
                             elements and                 Hub Unit                                                      Hub Unit
                             calliper guides
                                                             End                                                           End
     Trailer
  equipped with                                                                              Check Hub Unit
      EBS?                                                                                     Clearance
                                                                                                                    Bearing play >
  Yes        No                                        Trailer braking
                                                                                                                    SAF-HOLLAND
                                                       brake protocol
                                                                                                                        specs
                                                            OK?

    Connection                                                                                                       Yes          No
     ISO 7638                                           No         Yes
    7-pin OK?

                                                                                                         Replace         Hub Unit
  Yes        No                                                                                          Hub Unit          OK
                               Repair or
                               Replace                                                                        End           End

   TEBS failure
   protocol OK?
                               LSV OK?                                                                               Traktor / Trailer
   No       Yes                                                             Replace                                   synchr. OK?
                                                                            Hub Unit
                             Yes        No                                                                           Yes          No
                                                                              End


                            Trailer brake valve
                                                       Inspect, adjust or
   Repair EBS                     function/                                                                           Traktor OK?
                                                         repair parts to
   system acc.                 setting OK?
                                                        manufacturer’s
  manufacturer’s                                       specs, or replace
     specs.                  Yes           No                                                                        Yes          No



                                                                                                                     Check dynamic
                                                                                                                     pre dominance
                                                                                                                      and adjust, if
                                                                                                                       necessary
                                                          Replace
                                                          Hub Unit




 This sheet is intended merely as an aid to troubleshooting. Depending on the brake system version, differences are possible.
 SAF-HOLLAND can therefore assume no liability for correctness. Repairs to the brake system may only be carried out by authorised
 personnel.

SAF-HOLLAND GmbH • Hauptstr. 26 • D-63856 Bessenbach
Tel.: +49 (0) 6095 / 301 - 602 • Fax: +49 (0) 6095 / 301 - 259 • service@safholland.de • www.safholland.de               11.2009
Error flow chart Hub Unit “Bearing clearance“

Troubleshooting for Problems on All or Individual Wheels of the Trailer / Semi-trailer

                                                       Hub Unit
                                                      clearance?


                                              Bearing play checked to
                                               SAF-HOLAND spec.?


                                                yes                no

      Bearing play >                                                                                                    Check to
  SAF-HOLLAND spec.?                                                                                                  SAF-HOLLAND
                                                                                                                         specs.
     yes             no                               Check for noise           Noise heard
                                                                                   within
                                                                               SAF-HOLLAND
                                                                                  spec.?
                                                       Replace Hub
                                                           Unit                 yes         no                          Check for
                                                                                                                      grease leaking
                                                             End
   Clearance of
   brake calliper
       OK?                                                                                                     Grease Leaking >
                                                                                                             SAF-HOLLAND spec.?
  yes         no                                       Check brake                                              yes             no
                                                      calliper adjuster

  Seal elements
 of brake calliper                                                                 Replace                               Hub Unit
       OK?                                                                         calliper                                OK!

                                                                                                                             END
  yes         no                                       Replace seal
                                                       elements and
                                                       calliper guide                                                  Replace Hub
     Trailer                                                                                                               unit
  equipped with
      EBS?                                                                      Trailer braking                              End
                                                                                brake protocol
  yes         no                                                                     OK?


                                                             LSV                 no         yes
 Connection ISO                                              OK?
 7638 / 7 pin OK?                                                                                                     Tractor / trailer
                                                       yes         no                                                 synchronisation
                                                                                Replace Hub                                OK?
                                                                                    Unit
  yes         no                                                                                                       yes         no
                            Repair or
                                                  Trailer brake valve                 End
                            Replace
                                                        function/
   TEBS failure                                    adjustment OK?
   protocol OK?                                                                                                        Tractor OK?
                                                                                Inspect, adjust or
                                                    yes            no               repair to
   no        yes                                                                  manufacturer                         yes         no
                                                                                specs. or replace


   Repair TEBS                                                                                                        Check dynamic
  system acc. to                                                                                                      pre dominance
  manufacturer                                                                                                         and adjust, if
      specs.                                                                                                            necessary
                                                          Replace
                                                          Hub Unit



 This sheet is intended merely as an aid to troubleshooting. Depending on the brake system version, differences are possible.
 SAF-HOLLAND can therefore assume no liability for correctness. Repairs to the brake system may only be carried out by authorised
 personnel.

SAF-HOLLAND GmbH • Hauptstr. 26 • D-63856 Bessenbach
Tel.: +49 (0) 6095 / 301 - 602 • Fax: +49 (0) 6095 / 301 - 259 • service@safholland.de • www.safholland.de                   11.2009