The Pinion Bearing is Failing on Certain 797 Off-Highway Trucks {3256, 3258, 3281} Caterpillar


The Pinion Bearing is Failing on Certain 797 Off-Highway Trucks {3256, 3258, 3281}

Usage:

797 5YW
Off-Highway Truck/Tractor
797 (S/N: 5YW1-UP)
797B (S/N: JSM1-UP)
797F (S/N: LAJ1-UP; WSP1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem



Illustration 1g06250367

A potential pinion B1 Bearing oil leak has been found on the machines listed above. The oil lube leak is due to the split design of shim pack for the pinion which creates a gap (highlighted) and leads to leaking of oil in between the shim pack ends.

Solution



Illustration 2g06250364

Caterpillar is aware of this problem, and is recommending an interim corrective action. As an interim corrective action, install 099-4691 Locking Bolt in the pinion cage pusher hole (highlighted).

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