BONNET-OIL COOLER 2292282 - Caterpillar

This Revised Service Letter replaces the 28Nov2017 Service Letter. Changes have been made to the Affected Product.
TERMINATION DATE
30Nov2018
PROBLEM
The existing transmission main relief valve lock nuts can be loose on certain 793F Off-Highway Trucks. If the existing lock nut is loose it can fail transmission clutches.
AFFECTED PRODUCT
Model Identification Number
793F SSP01176-01177, 1179-1182
793F CMD RBT00187-00188
PARTS NEEDED
Qty
Part Number Description
1 7G6373 GASKET
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 32% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.
ACTION REQUIRED
When ever possible, this program should be implemented before the machine is put into service.
1. The initial inspection may be performed with the machine at room temperature in any location that allows clean and safe working conditions.
2. Follow all safety requirements to ensure safe access to the area around the transmission cover.
3. Remove the cover plate and set aside. Take care to avoid damage to the gasket when removing the cover from the transmission. Be sure to keep the cover protected from contamination.
4. Locate the transmission main relief valve (see photo below). Inspect the valve for the presence of a yellow dot. If the dot is present the valve has already been reworked. Skip to step 8.
5. With fingers, check the lock nut to see if it is loose. If it is tight, no further action is necessary. Skip to step 8.
6. If the lock nut is loose, the main relief pressure needs to be checked per the Transmission Test and Adjust KENR8393.
7. Once pressure is within spec, hold the adjusting screw to prevent turning and use a 1/2 inch (13mm) wrench to tighten the lock nut to 18 +/- 4 N-m.
8. Wipe off the mounting surfaces of both the transmission and cover to remove any debris and inspect the gasket for damage. Replace the gasket if necessary then reinstall the cover. Tighten the bolts to 55 +/- 10 N-m.
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SERVICE CLAIM ALLOWANCES
Product smu/age whichever comes first Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
0-6000 hrs,
0-12 mo 100.0% 100.0% 0.0% 0.0% 0.0% 0.0%
This is a 1.0-hour job
PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.