Fault Phenomenon: Komatsu WA380 wheel loader transmission pressure is low in all gears, engagement weak.

Troubleshooting Process:
– Checked variable pump: gear pump end wear, severe internal leakage.
– Checked suction strainer: strainer clogged causing insufficient suction.
– Checked pressure regulating valve: valve spring fatigued.
– Checked oil level: transmission fluid level too low.

Root Cause: The transmission variable pump (work pump) internal gear end wear reduces volumetric efficiency, unable to build sufficient transmission oil pressure.

Required Parts: Replace transmission variable pump.