BUSHING 3556760 - Caterpillar

Introduction
The problem that is identified below does not have a known permanent solution. Until a solution is known, use the solution that is identified below.Problem
The twelve 2B-2695 Bolts that secure the 2P-9336 Clutch Disc Assembly to the 3T-5419 Torque Converter Impeller that is inside the 6Y-5800 Torque Converter may loosen. Instances of failures of this bolted joint have been discovered after 3000 to 4000 hours. When the bolts back out, the impeller and other components are destroyed.Solution
Replace the 2B-2695 Bolts (5/16-18) with 1A-2029 Bolts (3/8-16). Perform the following procedure in order to complete the rework.
Illustration 1 g01237453
Enlarge the twelve 6.8 mm (0.2677 inch) holes (1) to 8.2 mm (0.3228 inch) and drill the twelve holes to a depth of 27 mm (1.0630 inch).
Tap the twelve holes (1) with a 3/8-16 THD tap.
Enlarge the diameter of the twelve holes in 2P-9336 Clutch Disc Assembly (2) from 9 mm (0.3543 inch) to 10.5 mm (0.4134 inch).
Install twelve new 1A-2029 Bolts (4) and twelve new 5M-2894 Hard Washers (3). Cross torque the bolts to 47 N m (35 lb ft) and allow the bolts to relax. Then, check the bolt torques again.
Rotate the impeller assembly after the new bolts have been installed. Check for interference with 6T-6778 Clutch Housing (5). Machine housing (5), if necessary.Note: Whenever this rework is performed, contact Benjamin McIntyre by one of the following means.McIntyre_Benjamin_A
(309) 675-2398