155031-9800 ZEXEL 9 421 610 774 BOSCH GOVERNOR SPRING 9421610774 1550319800 9813222440

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 must be administered as soon as possible. When reporting the repair, use "PI3979" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3979" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Refer to your Warranty Bulletin for detailed information in regards to Product Improvement Programs.
Completion Date
June 30, 1997Termination Date
January 31, 1998Problem
During an engine overspeed condition, the engine software may allow the desired injection actuation pressure to exceed the design limits of the unit injector hydraulic pump group, which may result in damage to the pump.
Affected Product
Model & Identification Number
769D (5TR1-216)
771D (6JR1-90)
773D (7ER1-166)
775D (6KR1-99)
Parts Needed
1 - Personality Module (If Needed) Current personality module part numbers can be determided by using NPR, the FIND System, SEHS9914, or the latest SIS Update (Set Up & Tool Guide CD).
Action Required
Replace the software in the engine ECM to March 1996 or newer.
PROCEDURE:
1. Using Caterpillar Electronic Technician (ET) or ECAP service tool, connect to the engine ECM and read the personality module release date.2. If the personality module release date is older than March 1996, replace the personality module or flash the personality module with March 1996 or newer software.Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach.(1-Owner Notification)Copy Of Owner Notification For U.S. And Canadian Owners