Fault Phenomenon: SANY SKT90 wide body mining truck a metallic impact sound occurs during startup, the transmission input shaft slips under heavy load.

Troubleshooting Process:
– Checked splines: connection splines between transmission input shaft and torque converter worn, pointed.
– Checked fit: excessive spline clearance.
– Checked alignment: poor engine-transmission alignment.
– Checked lubrication: lack of grease on splines.

Root Cause: The transmission input shaft splines were severely worn due to long-term high torque impact and lack of lubrication, reducing torque transmission capacity.

Required Parts: Replace transmission input shaft and torque converter output flange.