Fault Phenomenon: Foton Raysta L16 driveshaft functions normally when cold. During high-speed driving (operating temperature), the driveshaft carrier bracket breaks, a loud noise occurs, and the driveshaft eventually falls off.

Troubleshooting Process:
– Checked driveshaft balance: balance weights not missing.
– Checked bracket bolts: bolts tightened normally.
– Checked rubber support: rubber not aged.
– Measured bracket load at operating temperature: found uneven load distribution.

Root Cause: Casting defect in the driveshaft carrier bracket causes failure due to thermal fatigue.

Required Parts: Driveshaft intermediate carrier bracket assembly.