TRANSMISSION AR 6Y5955 - Caterpillar

August 18, 2001
(Revised September 2001)
U-220
A-150
AU-137
H-72
O-163
TM-9
Priority PRODUCT IMPROVEMENT PROGRAMFOR TIGHTENING THE INJECTOR ROCKER ARM JAM NUTS ON CERTAIN 988G WHEEL LOADERS,834G WHEEL TRACTORS, AND 836G LANDFILL COMPACTORS
1123 PI30230
This Program must be administered assoon as possible. When reporting the repair, use "PI30230" as the Partnumber and "7751" as the Group Number, "56" as the Warranty Claim DescriptionCode and "T" as the SIMS Description Code. Exception: If the repair isdone after failure, use "PI30230" as the Part Number, "7751" as the GroupNumber, "96" as the Warranty Claim Description Code, and "Z" as the SIMSDescription Code. The information supplied in this serviceletter may not be valid after the termination date of this program. Donot perform the work outlined in this Service Letter after the terminationdate without first contacting your Caterpillar product analyst. This Revised Service Letter replacesthe August 18, 2001 Service Letter. Changes were made to the Affected Product.
COMPLETION DATE
TERMINATION DATE
February 28, 2002 August 31, 2002PROBLEM
The Injector rocker arm jam nuts on some 834GWheel Tractors, 836G Landfill Compactors, and 988G Wheel loaders are comingloose.AFFECTED PRODUCT
Model Identification Number
988G 2TW75-76, 78-79, 91-361,366-367
834G 6GZ168-203
836G 7MZ270-412, 414PARTS NEEDED
No Parts NeededACTION REQUIRED
Remove the valve covers.
Place a flat head screwdriver in the injectoradjusting screw and see if it will turn.
If the screw turns then the unit injector needsto be adjusted.(See step 5)
If the screw will NOT turn, mark a line acrossthe screw, nut, and injector arm with a colored marker. Use a dial typetorque wrench and tighten the adjusting jam nut to 100+-10 N m (74+=7FT-LBS). Check the line to see if the screw has turned in relation to theinjector arm. If the screw has moved more than 15 degrees in relation tothe arm, then the unit injector needs to be re-adjusted.
If a unit injector needs to be adjusted referto the Systems Operation Testing and Adjusting module for the procedureto adjust electronic unit injectors. Torque the jam nut to 100NM.
Enter the repair into SIMS.
OWNER NOTIFICATION
U.S. and Canadian owners will receive the attachedOwner Notification.SERVICE CLAIM ALLOWANCES
Caterpillar Dealer Suggested Customer Suggested
Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
N/A 100% (*) 0 0 0 0
(*) 1.0 hour is allowed to Remove andInstall valve covers and torque the injector arm jam nuts. Six minutesis allowed to adjust each Unit Injector if needed - up to a maximum of.6 hours is allowed to adjust all six. U.S. and Canadian Dealers Only - Eligibledealers may enter a Type 2 SIMS ReportPARTS DISPOSITION
Handle the parts in accordance with your WarrantyBulletin on warranty parts handling.MAKE EVERY EFFORT TO COMPLETE THIS PROGRAMAS SOON AS POSSIBLE.
Attach. (1-Owner Notification)COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS
XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999PRIORITY - TIGHTENING THE INJECTOR ROCKER ARMJAM NUTSMODELS INVOLVED ? Certain 988G Wheel Loaders,834G Wheel Tractors, and 836G Landfill CompactorsDear Caterpillar Product Owner:The injector rocker arm nuts need to be tightenedon the products listed below. The nuts need to be tightened to preventthem from coming loose. Loose jam nuts could possibly cause the injectorrocker arm(s) to break and the related cylinders would not fire. You willnot be charged for the service performed.Contact your local Caterpillar dealer immediatelyto schedule this service. The dealer will advise you of