Fault Phenomenon: John Deere 750K dozer track carrier roller surface has oil stains, roller turns sluggishly.

Troubleshooting Process:
– Checked oil seal: floating oil seal failed.
– Checked lubricating oil: gear oil inside roller emulsified.
– Checked raceway: raceway surface spalling.
– Checked bolts: mounting bolts loose.

Root Cause: The floating oil seal of the carrier roller aged and failed, causing lubricating oil to leak and allowing sand and mud to enter, wearing the raceway.

Required Parts: Replace carrier roller floating oil seal or carrier roller assembly.