12210-ZW2-416ZA Honda CYLINDER HEAD *NH8* (DARK GRAY)

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 "PI3749" 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 "PI3749" 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
October 31, 1995Termination Date
April 30, 1996Problem
The idler gear shafts in the engine rear gear train may not fit in the flywheel housing correctly resulting in oil leaks on certain 988F and 990 Wheel Loaders.
Affected Product
Model & Identification Number
988F (8YG88-927, 8YG929-931, 8YG936-938, 8YG943, 8YG946, 8YG947, 8YG952, 8YG956)
990 (7HK28-160, 05A10310-10312)
Parts Needed
Dealers will need to order parts for this Program.
988F
2 - 5B5059 Bolt1 - 4J0520 Seal-O-Ring1 - 4J0524 Seal-O-Ring1 - 7J9108 Seal-O-Ring2 - 4K6804 Seal-O-Ring2 - 8L2777 Seal-O-Ring2 - 9M5024 Seal-O-Ring1 - 1P3705 Seal-Rectangular1 - 1P3706 Seal-Rectangular1 - 1P3707 Seal-Rectangular2 - 6V1195 Seal-O-Ring2 - 1241858 Seal-O-Ring3 - 1241859 Seal-O-Ring2 - 1229860 Shaft-Idler Gear990
2 - 5B5059 Bolt1 - 2H3934 Seal-O-Ring2 - 4J0522 Seal-O-Ring1 - 4J0527 Seal-O-Ring2 - 8L2777 Seal-O-Ring2 - 9M5024 Seal-O-Ring2 - 1P3704 Seal-Rectangular3 - 1P3705 Seal-Rectangular1 - 6V8397 Seal-O-RingAction Required
Parts Stock
Remove all 1061541 Idler Gear Shafts from parts stock.
Affected Product
See the attached procedure.
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
Parts Stock
Submit one claim for all 1061541 Idler Gear Shafts removed from parts stock.
US and Canadian Dealers Only - When submitting a parts stock claim use 99Z00007 in the Product Identification Number Field.
Affected Product
988F
This is an 8.0-hour job.
990
This is a 10.5-hour job.
U.S. and Canadian Dealers Only - This Program does not qualify for a Type 2 SIMS Report.
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) (2-Rework Procedure)Copy Of Owner Notification For U.S. And Canadian Owners
Rework Procedure
New O-Rings have been released to production but not yet identified in the parts book referenced for this procedure. Be sure to use the O-Rings identified in the "Parts Needed" secition of this service letter when installing the pumps and assemblies.
Refer to the illustration below to determine the area of the rework.
Illustration showing location of affected area.988F
Refer to the 988F Parts Manual, SEBP2049-01, pages 21.01 through 21.04 during this rework.
1. Install a new 1241858 Seal-O-Ring on each 1229860 Idler Gear Shaft. Set the shafts aside for 45 minutes to allow the seals to return to their correct size.2. Remove the cap from the hydraulic tank to relieve back pressure. If the hydraulic tank is at or below the full mark, no hydraulic oil needs to be drained.3. Remove the 4E4517 Hood and Guard Group (upper section with gull wing doors) as one unit. A crane with a 6.1 meter (20 foot) boom will be needed.4. Remove both hydraulic pumps. Refer to Parts Manual page 21.01.5. Remove both 4P4975 Power Take Off (PTO) adapters in the 4P3581 Rear Gear Group.6. Remove both 4P4974 PTO Adapter Assemblies/Bearing Assemblies and Gear Assemblies.7. Install a bolt (-20 threads) into the end of the shaft to pull out the bearing assembly and remove the existing 1061541 Idler Gear Shafts (Areas C and D on pages 21.01 and 21.03 in the Parts Manual).8. Inspect the flywheel housing counterbores where the idler gear shafts were installed. If there is