Usage:
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 "PS4099" 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
July 31, 1998Problem
The 5S1213 Plate, used with relief valve 5S1218 in radiator group 1W5232, was assembled upside down on some off-highway trucks. This causes the relief valve spring to compress too far, preventing the relief valve from working properly.
NOTE: Each radiator has two (2) relief valves).
Affected Product
Model & Identification Number
785B (6HK533-547)
789B (7EK399-413)
Parts Needed
- 4 - 5S4629 Gasket Valve
Action Required
Remove cover and valve assembly. Check that 5S1213 Plate is oriented with the lip facing down, as seen in Illustration 1. Replace 5S4629 Gaskets and reinstall valve assembly and cover.
Service Claim Allowances
NOTE: This is a 1-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.