COVER-ARM BASE 1W8521 - Caterpillar

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 "PS40025" 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.
This Revised Service Letter replaces the October 14, 1999 Service Letter. Changes have been made to the Affected Product.
Termination Date
October 31, 2000Problem
Cracked intake manifolds need to be reworked on certain D3C III, D4C III, D5C III Track Type Tractors and 933C, 939 and 939C Track Type Loaders. The intake manifolds may crack due to stresses resulting from air conditioner compressor mounting bracket hole misalignment.
Affected Product
Model & Identification Number
D3C III (6SL2630-Up, 7XL1202-Up, 4KS1-763, 4TS1-873, 5GS1-580, 9TS249-Up)
D4C III (6YL2025-Up, 7SL707-Up, 4LS1-460, 6BS1-573, 8CS1-997, 1FW289-Up)
D5C III (6ZL849-Up, 9DL2284-Up, 5HS1-728, 6CS1-706, 7PS1-1138, 8ZS235-Up)
933 (8FL417-Up, 9EL113-Up)
933C (4MS1-449, 5JS1-369)
939 (9GL678-Up)
939C (6DS1-927)
Parts Needed
See the attached Rework Procedure.
Action Required
See the attached Rework Procedure.
Service Claim Allowances
This is a 1.5-hour job.
If the manifold is cracked and needs to be replaced, an additional 6 hours for labor will be allowed.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.(1-Rework Proceudre)Rework Procedure
1. Remove the 1007059 Air Conditioning Compressor Support Bracket.2. Inspect the intake manifold adjacent to the Air Conditioning Compressor Support Bracket for cracking of the pedestal mounting boss where the bracket was bolted onto the manifold.3. If the manifold is cracked, replace the 1078360 Manifold using a new 1073664 Gasket. The air conditioning compressor support assembly will be reworked to prevent future failures.
4. If necessary slot the rear holes in the air conditioning compressor support bracket to eliminate any misalignment between the bracket holes and intake holes. See Illustration 1.5. Reinstall the 1007059 Air Conditioning Compressor Support Bracket and compressor. See Illustration 2. The intake manifold is aluminum so it is important not to over tighten the bolts. Using a 9S7353 Torque Wrench or equivalent, tighten all bolts to 28 7 N m (21 5 lb-ft) following the sequence in Illustration 2.
Illustration 1.
Illustration 2.