Fault Phenomenon: Caterpillar D9T dozer steering on one side is weak; under heavy load, that side’s track does not move, with a burning smell.

Troubleshooting Process:
– Checked operation: prolonged turning or braking on one side.
– Checked friction discs: disassembly revealed friction discs blackened, steel plates deformed.
– Checked piston: steering clutch piston seal failed.
– Checked oil pressure: pilot pressure normal.

Root Cause: Improper operation caused the steering clutch to slip for extended periods, generating high temperatures that burnt the friction discs.

Required Parts: Replace steering clutch friction disc set and seal repair kit.