Fault Phenomenon: XCMG LW500 wheel loader engine runs unevenly, with abnormal noise, injection timing inaccurate.

Troubleshooting Process:
– Checked gear: high-pressure pump drive gear severely worn.
– Checked keyway: drive shaft keyway elongated.
– Checked lubrication: insufficient oil pressure in gear chamber.
– Checked foreign objects: metal debris in gear chamber.

Root Cause: The high-pressure pump drive gear wore abnormally due to poor lubrication or incorrect installation clearance, affecting injection timing.

Required Parts: Replace high-pressure pump drive gear and related components.