Fault Phenomenon: LiuGong 856 wheel loader after one hour of continuous operation, torque converter oil temperature exceeds 120°C, machine automatically reduces power.

Troubleshooting Process:
– Checked cooler: torque converter oil cooler exterior clogged with mud.
– Checked fan: fan belt slipping or reversed.
– Checked torque converter: stator one-way clutch seized, causing excessive oil churning in the torus.
– Checked oil level: transmission fluid level too high or too low.

Root Cause: The torque converter oil cooler surface is completely covered with dust and oil sludge, resulting in almost zero cooling efficiency.

Required Parts: Clean radiator with compressed air or steam, replace transmission fluid.