Fault Phenomenon: John Deere 850K dozer blade automatically slides after swing stops.

Troubleshooting Process:
– Checked brake: brake spring broken.
– Checked friction discs: friction discs worn.
– Checked oil pressure: abnormal brake release pressure.
– Checked piston: brake piston stuck.

Root Cause: The spring in the swing motor’s internal brake is broken, unable to clamp the friction discs, causing brake failure.

Required Parts: Swing motor brake repair kit.