Product Support Program For Installing Midwheel Spacers On Certain Challenger 35, 45, And 55 Agricultural Tractors Caterpillar

Product Support Program For Installing Midwheel Spacers On Certain Challenger 35, 45, And 55 Agricultural Tractors

Usage:

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Caterpillar: Confidential Yellow

NOTE: The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

NOTE: This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4588" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

Termination Date

August 31, 1999

Problem

The rubber may separate from the midwheels on certain Challenger 35, 45, and 55 Agricultural Tractors, especially during long distance roading. Midwheel spacers need to be installed. This program applies only to those tractors previously reworked under Service Letter dated March 13, 1998, PS5394 (Product Support Program For Replacing Failed Midwheels On Certain Challenger 35, 45 and 55 Agricultural Tractors).

Affected Product
Model & Identification Number

CH35 (8DN1-881, 8DN897-920)

CH45 (1DR1-1767, 1DR1793-1896)

CH55 (7DM1-954, 7DM975-1256)

NOTE: This Program applies only to those tractors previously reworked under PS5394.

Parts Needed

12 - 1628462 SPACER

Action Required

1) Position the right hand undercarriage idler on stable blocking to allow the belt to drop away from the midwheels allowing free midwheel rotation. Apply the tractor parking brake. Chock both undercarriage belts to prevent tractor movement.

2) Remove the (12) 8T-4779 Bolts and (12) 9X-8257 Washers retaining a 1R-1210 Midwheel As. Retain all parts.

3) Carefully clean the mating surfaces of the midwheel hub, removed 1R-1210 Midwheel As., and 162-8462 Spacer to be added.

4) Reinstall the 1R-1210 Midwheel As., with a 162-8462 Spacer. Retain with the removed (12) 8T-4779 Bolts and (12) 9X-8257 Washers. (Use Illustration 1 as a guideline.)

5) Tighten the bolts in a cross-sequence pattern in three stages. Final tightening torque is 270 N·m (200 lb-ft).

6) Repeat Steps 2 through 5 for each of the remaining midwheel assemblies on the right hand side of the tractor. (The tractor may need to be repositioned to allow free rotation of the midwheels.)

7) Remove the belt chocks. Release the tractor parking brake. Move tractor off idler blocking.

8) Repeat Steps 1 through 7 for the six midwheel assemblies on the left hand side of the tractor.