LINES GP-COUPLER 3210139 - Caterpillar

Summary
This Guideline applies to the inspection of a used trunnion to determine if the trunnion can be used again. A used trunnion must be inspected for rubber cracking.The current recommendation states that the trunnion should be replaced at the third major overhaul. This guideline is a general recommendation and the trunnion can be used again after the third overhaul in many cases. At each rebuild, several recommendations can be followed to determine the specifications for "Use again" or "Do not use again". If these specifications are met, the trunnion can be used again.Trunnions that meet the specifications found in this Guideline and other applicable guidelines can be expected to give normal performance until the next overhaul, when used again in the same application. Never use a trunnion that this Guideline indicates should not be used again. Before installing a used or reconditioned part, correct any condition that may have caused the original wear.Nomenclature
Illustration 3 g02143661
The 7N-1863 Engine Trunnion is shown
(1) Bolt, (2) Hard Washer, (3) Outer Support, (4) Washer, (5) Bolt, (6) Mount Assembly and (7) Trunnion FrameVisual Inspection
Once the trunnion assembly has been removed, the trunnion should be visually inspected. The following photographs are examples of trunnion mount assemblies that can and cannot be used again.Inspect the rubber in the mount assembly for deterioration. Also check the bonding between the rubber and the inner ring. If the trunnion is to be used again, the rubber must be pliable. If the rubber is hard and dry with severe cracks, the mount assembly should not be used again. The following photographs will help determine if a trunnion can be used again.
Illustration 4 g01996034
Example of numerous shallow cracks but the rubber is still pliable
USE AGAIN
This part can be used again if the cracks are shallow and the rubber is still pliable.
Illustration 5 g01996055
Example of a deep crack, but the rubber is still pliable
USE AGAIN
The next three illustrations show typical examples of the rubber cracking. The cracks shown in these illustrations will not affect the performance of the trunnion because the rubber is still pliable.
Illustration 6 g01996073
One large crack but the rubber is still pliable
USE AGAIN
Illustration 7 g01996074
Small cracks but the rubber is still pliable
USE AGAIN
Illustration 8 g01996075
Small cracks but the rubber is still pliable
USE AGAIN
The next four illustrations show examples of trunnions that have the rubber falling apart. These are examples of parts that should not be used again.
Illustration 9 g01996094
An example of rubber that is cracked and falling apart and the rubber is also soft and spongy
DO NO USE AGAIN
Illustration 10 g01996116
Example of small cracks, but the rubber is dry and hard
DO NO USE AGAIN
Illustration 11 g01996118
Example of shallow cracks, but the rubber is hard
DO NO USE AGAIN
Illustration 12 g01996119
Example of severe deep cracks and hard rubber
DO NO USE AGAIN