NUT DRIVER 3282047 - 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 must be administered as soon as possible. When reporting the repair, use "PI3651" 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 "PI3651" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and " Z" as the SIMS Description Code.
Completion Date
March 31, 1994Termination Date
September 30, 1994Problem
The lower piston pump, crankshaft and/or engine crankshaft thrust bearings may fail on certain 330 and 330L Excavators.
Affected Product
Model & Identification Number
330 (9NG1-353, 9NG355; 6WJ1-221, 6WJ223-380; 9PJ1-80, 9PJ82, 9PJ87-133, 9PJ136, 9PJ137; 9WJ1-33; 6SK1-238)
330L (8FK1-187, 8FK189-197, 8FK199-200, 8FK202, 8FK206, 8FK208, 8FK210-213, 8FK216
Parts Needed
Dealers will need to order parts for this Program.
1 - 1R0739 FilterDealers should order the following parts, as required per the rework procedure:
1 - 6E1572 Seal1 - 9H5921 Gasket - Flywheel Housing1 - 5I4405 Rotating Group1 - 5I4406 Rotating Group1 - 5I4476 Plate1 - 4M2969 Gasket - Oil Pan2 - 7N9342 Plate - Thrust Bearing1 - 8N0110 Gasket - Front Housing1 - 0R1238 Crankshaft Assembly1 - 8S1965 Gasket - Oil Pan1 - 1W3900 Gasket Front Housing1 - 4W0452 Seal - Crankshaft1 - 9Y9895 Seal - Crankshaft1 - 944412 Filter - Main Return The 1R0739 Filter will be used on all inspections and repairs. All other parts should be replaced only if required.
Action Required
See the attached procedure.
Service Claim Allowances
Parts Disposition
Handle parts in accordance with your Warranty Bulletin on warranty parts handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach. (1-Rework Procedure)Rework Procedure
Action Required
Part 1. Remove The Main Piston Pump
a. Drain the hydraulic oil. Follow the disassembly and assembly manual instructions to remove the main piston pump. b. Remove the main hydraulic return filter from the hydraulic tank and inspect for debris.Part 2. Measure The Engine Crankshaft Axial Endplay
a. Remove the engine oil filter and cut it open to inspect for debris.b. With the pump removed position a dial indicator on the flywheel.c. Pry the crankshaft rearward. Zero the dial indicator and pry the crankshaft flywheel forward. Record the endplay.d. If the engine crankshaft does not exceed .015 "(0.38mm) and if no debris is in the engine oil filter, go to PART 3.e. If the engine crankshaft axial endplay exceeds .015 " (0.38mm) or if there is debris in the engine oil filter, remove the 3306 oil pan and inspect the rear engine thrust bearing. If the aluminum layer on the rear thrust bearing is completely worn off, inspect the crankshaft thrust bearing surface. If the crankshaft bearing surface is rough or grooved, replace the crankshaft. See Illustration 1.
Illustration 1
Illustration 2Part 3. Inspect The Pump Barrel Surfaces Which Contact The Port Plates.
See Illustration 2.
a. Place the pump so the input