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Meritor TP-9579 Technical Bulletin

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Technical Bulletin
TP-9646
TP-9647
TP-9648
TP-9579A
TP-9579B
TP-9579C
TP-9579ALBL
TP-9781
16579
Printed in the USA
Index
Driver Controlled Main Differential Lock (DCDL)
All Meritor single rear drive axles with DCDL option
Inter-Axle Differential (IAD)
All Meritor tandem drive axles
Inter-Axle Differential (IAD) and Driver Controlled Main
Differential (DCDL)
All Meritor tandem drive axles equipped with both IAD and DCDL
Axle Preparation Instructions for Vehicle Towing or New
Vehicle Drive-Away (Piggybacking)
Single axle without DCDL
Tandem axle without DCDL, with IAD
Axle Preparation Instructions for Vehicle Towing or New
Vehicle Drive-Away (Piggybacking)
Single axle with DCDL (threaded shift assembly)
Tandem axle with DCDL (threaded shift assembly) with IAD
Axle Preparation Instructions for Vehicle Towing or New
Vehicle Drive-Away (Piggybacking)
Single axle with DCDL (bolt-on shift assembly)
Tandem axle with DCDL (bolt-on shift assembly) with IAD
DCDL Label
Installing the Meritor Driver Controlled Main Differential
Lock (DCDL)
All single and tandem drive axles
Copyright Meritor, Inc., 2018
Driver Instruction
Kit TP-9579
TP-9579
Revised 11-18
TP-9579
Revised 11-18
Page 1

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Summary of Contents for Meritor TP-9579

  • Page 1 All Meritor tandem drive axles TP-9648 Inter-Axle Differential (IAD) and Driver Controlled Main Differential (DCDL) All Meritor tandem drive axles equipped with both IAD and DCDL TP-9579A Axle Preparation Instructions for Vehicle Towing or New Vehicle Drive-Away (Piggybacking) Single axle without DCDL...

  • Page 3: Operation Tips

    The purpose of the DCDL in a Meritor axle is to provide maximum vehicle traction and control on unfavorable road or highway surfaces. When the DCDL is actuated, a clutch collar completely locks the differential case, gearing, and axle shafts together.

  • Page 4: Driver Instructions

    Information contained in this publication was in effect at the time the publication was approved for printing and is subject to 2135 West Maple Road change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the information presented or Troy, MI 48084 U.S.A.
  • Page 5 Tandem Drive Axles Technical Bulletin Introduction Operation Tips The Meritor Inter-Axle Differential (IAD) is a driver-controlled, air- The IAD is driver controlled. actuated traction device that allows for speed differences between The IAD switch should be in the “UNLOCK” position for normal the forward and rear tandem axles while providing equal pulling operating conditions where there is good traction.
  • Page 6 Information contained in this publication was in effect at the time the publication was approved for printing and is subject to 2135 West Maple Road change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the information presented or Troy, MI 48084 U.S.A.
  • Page 7 This option is available on most models of Meritor tandem axles. The DCDL is used during on- and off-highway operations that encounter slippery road conditions and/or uneven terrain. It is used only at low speeds while...
  • Page 8 When the DCDL is fully locked, the vehicle will have an “understeer” condition when making turns. Proceed cautiously over poor road or highway conditions at 25 mph or less using good driving judgment. TP-9648 Revised 11-18 (16579) Page 2 Copyright Meritor, Inc., 2018 Printed in the USA...
  • Page 9 Flip the switch to the “UNLOCK” position while maintaining vehicle speed. Let up momentarily on the accelerator. The differential lock will promptly disengage. Resume a safe vehicle speed. TP-9648 (16579) Revised 11-18 Printed in the USA Copyright Meritor, Inc., 2018 Page 3...
  • Page 10 Information contained in this publication was in effect at the time the publication was approved for printing and is subject to 2135 West Maple Road change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the information presented or Troy, MI 48084 U.S.A.

  • Page 11: Type Of Axle

    flange of the axle shaft. These instructions are for vehicles equipped with Figure 1 . Meritor single or tandem rear drive axles. 6. Loosen the tapered dowels, if used, in the The instructions supersede all other instructions flange of the axle shaft using one of the two...
  • Page 12 Refer to the manufacturer’s axle shaft and tapered dowels from the hub. instructions. Figure 3 . TP-9579A Issued 7-95 16579/22882 Page 2 © Copyright Meritor Automotive, Inc., 1995 Printed in the USA...
  • Page 13 2. Apply the vehicle spring (parking) brakes by necessary. For information about lubrication, manually releasing each spring that was refer to the Meritor Maintenance Manual, MM compressed before transporting started. Refer No. 1, Lubrication , or refer to the lubrication to manufacturer’s instructions.
  • Page 14 Information contained in this publication was in effect at the time the publication was approved for printing and is 2135 West Maple Road subject to change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the Troy, MI 48084 U.S.A.
  • Page 15 Shift Assembly — Refer to Technical Bulletin, Table A TP-9579C These instructions are for vehicles equipped with Single Axles Meritor single or tandem rear drive axles. Remove both axle shafts. The instructions supersede all other instructions Tandem Axles for the purpose of transporting vehicles for service...
  • Page 16 The axle shaft can now be removed. • If you still feel a high resistance: Stop turning the capscrew, disassemble and inspect components for damage and wear. Replace as necessary. TP-9579B Revised 12-09 16579 Page 2 © Copyright Meritor Automotive, Inc., 2009 Printed in the USA...
  • Page 17 Hold a 1.5-inch (38.1 mm) diameter brass drift against the center of the axle shaft flange, INSIDE THE ROUND DRIVING LUGS. Figure 5. AIR HAMMER AND BIT TP-9579B 16579 Revised 12-09 Printed in the USA © Copyright Meritor Automotive, Inc., 2009 Page 3...
  • Page 18 If an auxiliary air supply was not used, begin with Step 2. TP-9579B Revised 12-09 16579 Page 4 © Copyright Meritor Automotive, Inc., 2009 Printed in the USA...
  • Page 19 100 - 145 (136 - 197) 0.62” - 18 130 - 190 (176 - 258) 0.75” - 16 270 - 350 (366 - 475) TP-9579B 16579 Revised 12-09 Printed in the USA © Copyright Meritor Automotive, Inc., 2009 Page 5...
  • Page 20 Information contained in this publication was in effect at the time the publication was approved for printing and is 2135 West Maple Road subject to change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the Troy, MI 48084 U.S.A.
  • Page 21 Shift Assembly — Refer to Technical Bulletin, TP-9579B Table A These instructions are for vehicles equipped with Meritor single or tandem rear drive axles. Single Axles The instructions supersede all other instructions Remove both axle shafts. for the purpose of transporting vehicles for service...
  • Page 22 The axle shaft can now be removed. • If you still feel a high resistance: Stop turning the capscrew, disassemble and inspect components for damage and wear. Replace as necessary. TP-9579C Revised 12-09 16579/22882 Page 2 © Copyright Meritor Automotive, Inc., 2009 Printed in the USA...
  • Page 23 Hold a 1.5-inch (38.1 mm) diameter brass drift against the center of the axle shaft flange, INSIDE THE ROUND DRIVING LUGS. Figure 5. AIR HAMMER AND BIT TP-9579C 16579/22882 Revised 12-09 Printed in the USA © Copyright Meritor Automotive, Inc., 2009 Page 3...
  • Page 24 If an auxiliary air supply was not used, begin with Step 2. TP-9579C Revised 12-09 16579/22882 Page 4 © Copyright Meritor Automotive, Inc., 2009 Printed in the USA...
  • Page 25 100 - 145 (136 - 197) 0.62” - 18 130 - 190 (176 - 258) 0.75” - 16 270 - 350 (366 - 475) TP-9579C 16579/22882 Revised 12-09 Printed in the USA © Copyright Meritor Automotive, Inc., 2009 Page 5...
  • Page 26 Information contained in this publication was in effect at the time the publication was approved for printing and is 2135 West Maple Road subject to change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the Try, MI 48084 USA information presented or to discontinue the production of parts described at any time.
  • Page 27 The differential lock is available on many Meritor case. When the splines on the shift collar are single axles and on one or both axles of certain engaged with the splines on the differential case, tandem drive axles.

  • Page 28: Installation In Vehicle

    8. Connect an air line from the air supply tank to the supply side of the transmission low range control valve. TP-9781 Issued 4-97 16579/22882 Page 2 © Copyright Meritor Automotive, Inc., 1997 Printed in USA...
  • Page 29 INDICATOR (SERVICE) LIGHT SUPPLY TANK TRANSMISSION SENSOR/ SWITCH 12 V. ELECTRIC NO. 1 AXLE NO. 2 AXLE DIFFERENTIAL LOCK ACTUATOR BOTH TANDEM AXLES DCDL INSTALLATION TP-9781 16579/22882 Issued 4-97 Printed in USA © Copyright Meritor Automotive, Inc., 1997 Page 3...
  • Page 30 Information contained in this publication was in effect at the time the publication was approved for printing and is subject to 2135 West Maple Road change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the information presented or Try, MI 48084 U.S.A.
  • Page 32 Information contained in this publication was in effect at the time the publication was approved for printing and is 2135 West Maple Road subject to change without notice or liability. Meritor Heavy Vehicle Systems, LLC, reserves the right to revise the Troy, MI 48084 USA information presented or discontinue the production of parts described at any time.