ACTUATOR GP 3103988 - 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 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 "PS8847" 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 March 5, 1997 Service Letter. Changes have been made to the Affected Product and Parts Needed.
Termination Date
March 31, 1998Problem
The exhaust manifold joints may seize up, causing the bolts that attach the manifold to the cylinder head to break due to expansion of the manifold. Bolts mainly break on the end of the manifold. A new seal and sleeve should be installed on the end sections of the manifold to prevent this from occurring.
Affected Product
Model & Identification Number
Group 1
D11N (74Z235-1152)
776B (6JC45-108)
777B (4YC59-838, 4YC840, 4YC841, 4YC843, 4YC848-852, 4YC854, 4YC863, 4YC877, 4YC999)
784B (5RK12-25)
785 (8GB118-697, 8GB862)
785B (6HK101-704)
789 (9ZC111-677)
789B (7EK111-568)
994 (9YF6-210)
5230 (7LL21-74)
The following list of new or remanufactured engine serial numbers are eligible for this program if they are either in dealer's Parts Stock or are a swing engine.
3508 (99W1-3518, 7YG1-2001 )
3512 (96Z1-921, 4WJ1-903 )
3516 (54Z1-1165, 2PK1-1360 )
Reman (3508) (4ZL1-375, 5TL1-200)
Reman (3512) (5EL1-125, 6FL1-119)
Reman (3516) (7CL1-359, 6CL1-223)
Group 2
793 (3SJ6-56)
793B (1HL12-524)
The following list of new or remanufactured engine serial numbers are eligible for this program if they are either in dealer's parts stock or are a swing engine.
3516 (54Z1-1165, 2PK1-1360 , 7TR1-217 )
Reman (3516) (7CL1-359, 6CL1-223)
Group 3
D11N (4HK361-635)
D11R (8ZR297-393)
776C (2TK76-114)
777B (4YC839, 4YC842, 4YC844-847, 4YC853, 4YC855-862, 4YC864-876, 4YC878-998, 4YC1000-1866 )
777C (4XJ77-1123)
5130 (5ZL21-118)
The following list of new or remanufactured engine serial numbers are eligible for this program if they are either in dealer's parts stock or are a swing engine.
3508 (99W1-3518, 7YG1-2001 )
Reman (3508) (4ZL1-375, 5TL1-200)
Parts Needed
Group 1
16 - 5M2894 Washer16 - 2N2766 Locknut*12 - 4P7680 Spacer16 - 5P3961 Bolt16 - 5P2755 Bolt 4 - 7W8145 Gasket* 4 - 1138189 Spacer