BLOCK 4978507 - Caterpillar

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.
This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS5358" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Termination Date
September 30, 1998Problem
Water may enter the rack position sensor control enclosure.
Affected Product
Model & Identification Number
3512 (1LM23-141)
Parts Needed
1 - 8J8725 Seal-O-Ring4 - 3N6744 Washer2 - 5R7136 Washer1 - 9X3495 Clip Assembly1 - 1417049 Box Assembly1 - 1417050 Harness Assembly1 - 1435188 NutAction Required
1. Remove the 7E9701 Nut, 7W2795 Collar, and the 1086284 Box Assembly.2. Mount the 6T9593 Control Group in the new 1417049 Box Assembly using (2) 5R7136 Sealing Washers and mount to the housing with (4) 3N6744 Sealing Washers and a 8J8725 Seal.3. Install a 7W2795 Collar, new 1435188 Nut and a 1417050 Harness Assembly.4. Calibrate rack position sensor as indicated in SENR6493-01.5. Install Safety wire and seal.6. Install a new 9X3495 Clip on the upper left hand cam cover bolt of cylinder number 2 and fasten the harness.Service Claim Allowances
This is a 1.5-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.