Fault Phenomenon: Komatsu D375A dozer after the blade swing stops, it automatically slides due to ground slope, unable to lock position.

Troubleshooting Process:
– Checked brake: internal multi-disc brake of the motor worn.
– Checked brake oil pressure: insufficient brake release pressure or unable to build.
– Checked spring: brake spring broken.
– Checked friction discs: friction discs contaminated with oil, slipping.

Root Cause: The friction discs of the normally closed brake inside the blade swing motor are excessively worn, resulting in insufficient braking torque.

Required Parts: Swing motor brake repair kit.