Fault Phenomenon: Komatsu D375A dozer a metallic impact sound occurs during startup, slipping under heavy load.

Troubleshooting Process:
– Checked transmission: input shaft splines worn into a spiral shape.
– Checked torque converter: torque converter hub splines worn.
– Checked alignment: poor engine-transmission alignment.
– Checked lubrication: lack of grease on splines.

Root Cause: Fretting wear on the connection splines between the transmission input shaft and torque converter caused excessive clearance, resulting in noise and impact.

Required Parts: Transmission input shaft and torque converter hub, apply anti-seize compound.