PLATE 2027531 - Caterpillar

This Revised Service Letter replaces the 16Jan2018 Service Letter. Changes have been made to the Affected Product.
TERMINATION DATE
31Jan2020
PROBLEM
The existing 8R-7036 (also listed as 8X-0432 and 8R-7034) Spider and Bearing Group, which is part of the 314-7807 (and 8X-0433) Joint Group, may fail on certain 793C and 793D Off-Highway Trucks. The spider and bearing group can fail because it does not have enough torque capacity for certain applications. The problem is initially felt as a vibration in the machine and can be heard as noise from the driveline. If the existing Spider and Bearing Group fails it may severely damage the torque converter, transmission and/or surrounding components.
AFFECTED PRODUCT
Model Identification Number
793D FDB01759, 1761, 1764-1765, 1776, 1780-1782, 1790-1791, 1796, 1799-1800
PARTS NEEDED
Qty
Part Number Description
16 2N2486 BOLT-POINT HEAD
2 3631923 UNIV JOINT AS
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
Refer to the Service Manual if/as necessary. Replace the existing 8R-7036 Spider and Bearing Group with the higher torque capacity 363-1923 Spider and Bearing Group (Universal Joint).
Ensure the universal joint is properly seated and tighten the 2N-2486 Bolts to a torque of 550 +/- 20 Nm (405 +/- 15 lb-ft). Reference SIS media number RENR8328 - Drive Shaft (Main) - Remove and Install as needed.
SERVICE CLAIM ALLOWANCES
Product smu/age whichever comes first Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
0-40000 hrs,
0-90 mo 100.0% 100.0% 0.0% 0.0% 0.0% 0.0%
This is a 4.0-hour job
PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.