RING-RETAINING 3E4363 - Caterpillar

TECHNICAL INFORMATION BULLETIN September 10, 2003
Wheel Loaders 992G (S/N: 7HR318-UP, ADZ1-515)
Component Code(s) 7057, 7100SUBJECT: Inspection To Prevent Articulation Hitch Failures
PROBLEM:
The bolts holding the top plate of the top hitch pin are breaking. Also, the welds of the upper hitch on the engine end frame are cracking.
SOLUTION:
Inspect the upper articulation pin joint for broken bolts. The bolts at risk fasten the 4E-8153, top retaining plate (2), to the 4E-8152, top articulation pin (4). If any broken bolts are found all 6 bolts (1) should be replaced with new 106-4175 bolts and the joint should be shimmed per the following instructions.
Bolt the 4E-8153 retaining plate (2) to the 4E-8152 pin (4) with three bolts. Measure the gap between the pin retaining plate and the upper boss surface thru two small holes. Average the measurement to determine the shim thickness from a new 4E-8157 shim pack (3). Remove and reassemble the 4E-8153 retaining plate (2) with the measured amount of shims. Tighten the 12 bolts and washers to 240+/-40 N.m torque. Tighten the 6 new bolts (1) to 530+/- 70 N.m torque.
Please report any broken bolts found and or any changes in the number of shims used to Large Wheel Loader Product Support.
Nick Boss 630-859-5942
Rich Piercy 630-859-5520
Doug Long 630-859-4294
Also, inspect the upper hitch area of the engine end frame for cracks. Cracking has been observed in the weld around the boss on the top of the upper hitch plate. The second area to watch for cracks is where the W shaped spreader plate welds to the bottom surface of the upper hitch plate. If the cracks are found early they can be repaired with a normal gouge and weld field repair process. If the cracks have propagated to the front edge of the hitch plate, contact LWL Product Support for a repair procedure.
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