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 "PS8389" 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.
NOTE: Although this program is to be administered as described above on the Affected Product, parts should be removed from Parts Stock as soon as possible.
NOTE: This Revised Service Letter replaces the September 14, 1995 Service Letter. Changes have been made to the Problem, Affected Product, Action Required and Service Claim Allowances.
Termination Date
September 30, 1996Problem
The restrictor valves on certain 428B and 438B Backhoe Loaders are noisy. These valves need to be replaced with new valves, that have been changed internally, to reduce noise.
Affected Product
Model & Identification Number
Group 1
428B (7EJ4254-4407, 7EJ4409-4414, 7EJ4417-4423, 7EJ4425-4468, 7EJ4472-4474, 7EJ4478-4486, 7EJ4490-4497, 7EJ4499-4547, 7EJ4549-4569, 7EJ4573-4588, 7EJ4590-4665, 7EJ4667-4672, 7EJ4677-4686, 7EJ4689-4697, 7EJ4699-4706, 7EJ4708, 7EJ4711-4715, 7EJ4717-4740, 7EJ4744-4779, 7EJ4781-4813, 7EJ4821-4825, 7EJ4830-4838, 7EJ4842, 7EJ4846-4849, 7EJ4852-4865, 7EJ4873-5009, 7EJ5044, 7EJ5047, 7EJ5051-5072, 7EJ5080-5085, 7EJ5087-5094, 7EJ5096-5118, 7EJ6717-6731, 7EJ6738, 7EJ6740, 7EJ6744, 7EJ6746, 7EJ6748, 7EJ6753-6755, 7EJ6762, 7EJ6764-6765, 7EJ6777-6778)
438B (3KK1614-1678, 3KK1680-1726, 3KK1728-1743, 3KK1746-1748, 3KK1751-1820, 3KK1822-1823, 3KK1825-1849, 3KK1851-1871, 3KK1875-1877, 3KK1879-1880, 3KK1882-1883, 3KK1885, 3KK1888-1897, 3KK3084, 3KK3086-3087, 3KK3096-3098)
Group 2
428B (7EJ4408, 7EJ4415-4416, 7EJ4424, 7EJ4469-4471, 7EJ4475-4477, 7EJ4487-4489, 7EJ4498, 7EJ4548, 7EJ4570-4572, 7EJ4589, 7EJ4666, 7EJ4673-4676, 7EJ4687-4688, 7EJ4698, 7EJ4707, 7EJ4709-4710, 7EJ4716, 7EJ4741-4743, 7EJ4780, 7EJ4814-4820, 7EJ4826-4829, 7EJ4839-4841, 7EJ4843-4845, 7EJ4850-4851)
438B (3KK1679, 3KK1727, 3KK1744-1745, 3KK1749-1750, 3KK1821, 3KK1824)
Parts Needed
Group 1
Group 2
Action Required
Affected Product
Remove the existing valve group and replace with a new valve group of the same number.
Parts Stock
Remove all 1131984 and 1178230 Restrictor Valves from Parts Stock.
Service Claim Allowances
Affected Product
NOTE: This is a 1 hour job. If the machine was repaired using a new spring provided by the factory, then 2 hours of labor only may be claimed.
Parts Stock
Submit one claim for all 1131984 and 1178230 Restrictor Valves removed from Parts Stock.
NOTE: U.S. and Canadian Dealers Only - When submitting a Parts Stock claim use 99Z00001 in the Product Identification Number Field.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.