BODY AS-PISTON 9Y4187 - Caterpillar

Caterpillar: Confidential Yellow
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 "PS40034" 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.
1999 COFA mail code AU-289 is not in order since it was added at Revision SEBE7118-02 in April 2000.
This Revised Service Letter replaces the December 9, 1999 (Revised February 2000) Service Letter. Changes have been made to remove the references to Freightliner and to add Mail Code AU-289.
Termination Date
December 31, 2000Problem
The factory installed 1731498 Idler Pulley Assembly may be defective on certain 3406E, C-10, and C-12 Engines. Because the defective pulleys are no longer being produced and only occurred within the serial number range listed, the updated pulley assembly's part number will not change.
Affected Product
Model & Identification Number
3406E (2WS27532-31134)
C-10 (3CS6531-7153)
C-12 (2KS20535-22549)
Parts Needed
1 - 1731498 PULLEY AS-IDAction Required
Check the engine to see if it is equipped with the 1731498 Idler Pulley Assembly. Verify that the pulley had not been replaced previously (check SIMS and/or with the customer). If the pulley is the original pulley, remove it and replace it with a new 1731498 Pulley Assembly.
IllustrationService Claim Allowances
This is a 0.5-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.