Fault Phenomenon: Lonking 850 wheel loader a loud metallic impact sound comes from the chassis during startup or gear shifting.

Troubleshooting Process:
– Checked universal joint: driveshaft universal joint cross worn loose or broken.
– Checked spline: telescoping spline severely worn.
– Checked bolts: flange connecting bolts loose.
– Checked alignment: transmission and drive axle misaligned.

Root Cause: The driveshaft universal joint cross lacked lubrication, causing dry wear, leading to needle bearing cage collapse and excessive clearance creating impact.

Required Parts: Replace driveshaft universal joint assembly or entire driveshaft.