Fault Phenomenon: Caterpillar D9T dozer low-speed operation power is insufficient, torque converter oil temperature rises quickly.

Troubleshooting Process:
– Checked torque converter: stator one-way clutch slipping.
– Checked performance: torque multiplication factor decreased.
– Checked oil quality: friction material debris in oil.
– Checked temperature rise: abnormal temperature rise.

Root Cause: The stator one-way clutch inside the torque converter is worn and slipping.

Required Parts: Torque converter overhaul kit.