- Track-Type Tractor
- D6T (S/N: 2D21-UP; CR31-UP; 2B31-UP; MB51-UP; AK71-UP; MH71-UP; CG81-UP; 7C91-UP; SGA1-UP; KSB1-UP; ZJB1-UP; JZC1-UP; DTD1-UP; RAD1-UP; STE1-UP; EJJ1-UP; SLJ1-UP; GMK1-UP; RRK1-UP; JML1-UP; MEL1-UP; JNM1-UP; TSM1-UP; WLM1-UP; WRN1-UP; K1R1-UP; KMR1-UP; WES1-UP; HYT1-UP; SGT1-UP; JRW1-UP; RCW1-UP; NDY1-UP; TMY1-UP; HTZ1-UP; SGZ1-UP)
- D8T (S/N: J8B1-UP; FMC1-UP; MLN1-UP; FCT1-UP; KPZ1-UP)
Reference: Disassembly and Assembly , M0073303 , "D6T Track Type Tractor Power Train" , Transmission - Remove and Install
Reference: Disassembly and Assembly , M0076745 , "D8R and D8T Track-Type Tractor Power Train" , Transmission - Remove and Install
A procedure to realign transmission slide rails is available for certain D6T and D8T Track-Type Tractors.
Rail alignment should be checked whenever a cracked or broken non-metallic roller is discovered as the transmission is removed from the machine. The relocation of transmission slide rails and installation of metallic slide rollers will improve the service life of the machine.
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| Illustration 1 | g06237766 |
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View showing broken roller | |
This procedure is adaptable to the machines within the listed serial numbers, and is effective with all machines after the listed serial numbers.
Parts Required
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| Illustration 2 | g06273134 |
| Parts Required | ||||
|---|---|---|---|---|
| Item | Qty | New Part Number | Part Name | Former Part Number |
| 1 | 2 | Bosses | ||
| 2 | 2 | Rollers | ||
Tooling Required
The following tooling is required for use to correctly relocate the transmission slide rails.
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| Illustration 3 | g06272662 |
| Tooling Required | ||
|---|---|---|
| Item | Tool Number | Description |
| 3 | FT3541 | Weld Fixture As |
Assess the Position of the Rails and Condition of the Rollers
- Remove the transmission from the machine.
Refer to Disassembly and Assembly , M0073303 , "D6T Track Type Tractor Power Train" , Transmission - Remove and Install or Disassembly and Assembly , M0076745 , "D8R and D8T Track-Type Tractor Power Train" , Transmission - Remove and Install.
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Illustration 4 g06237953 View showing location of bosses - Looking from the rear of the machine, identify the rails which are slip-fitted over the pair of bosses welded to the front of the case.
Rework Procedure
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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Cat dealer for replacement manuals. Proper care is your responsibility. |
- Remove left rail (A) and right rail (B).
- Using a hand grinder, cut off both bosses.
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Illustration 6 g06273195 View showing FT3541 installed with bosses in position
(1)8Y-3795 Bosses
(3) FT3541 Weld Fixture As - Install FT3541 Weld Fixture As (3) to locate correct boss position.
- Weld new bosses (1) in the correct location.
Note: Take care to clean all weld chips, spatter, grinder dust, and any other debris from the case. Cleanliness in this area is critical to successful transmission operation.
- Install the rails.
- Install new steel 523-4605 Rollers (2) to replace the current steel or non-metallic 6T-3852 Rollers.
- Install the transmission, using new seals.
Refer to Disassembly and Assembly , M0073303 , "D6T Track Type Tractor Power Train" , Transmission - Remove and Install or Disassembly and Assembly , M0076745 , "D8R and D8T Track-Type Tractor Power Train" , Transmission - Remove and Install.
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| Illustration 5 | g06237960 |
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View showing position of rails (A) Left rail (B) Right rail | |
If the final drives are removed, look inside the case and make sure that the rollers are not resting tight on the rail and not hitting the front of the case with the transmission correctly torqued in position.
On a D8 only, if the roller is hitting the front of the case, you may need to remove the transmission and grind some material from the case where the roller is contacting. This possibility is slight, but should be checked.