Fault Phenomenon: Caterpillar 12M3 grader front wheel hub temperature is abnormally high after driving.

Troubleshooting Process:
– Checked bearing preload: adjusting nut too tight.
– Checked grease: insufficient grease.
– Checked oil seal: oil seal too tight.
– Checked bearing: ball bearing spalling.

Root Cause: The front wheel hub bearing preload was adjusted too tightly.

Required Parts: Wheel hub bearing assembly and readjustment.