Fault Phenomenon: BelAZ 7540A mining truck a periodic “whining” sound comes from the chassis while driving, increasing with vehicle speed.

Troubleshooting Process:
– Checked bearing: driveshaft center support bearing cage collapsed or lacked oil.
– Checked rubber mount: support rubber mount aged and cracked.
– Checked alignment: driveshaft dynamic balance failed or incorrect installation angle.
– Checked lubrication: grease fitting clogged.

Root Cause: The driveshaft center support bearing lacked lubrication and was subjected to long-term torsional stress, causing the balls to wear and break.

Required Parts: Replace driveshaft center support bearing assembly.