Fault Phenomenon: XCMG XKT mining truck an obvious crack is found in the middle of the frame rail, with a tendency to propagate.

Troubleshooting Process:
– Checked crack: located in stress concentration area (e.g., near suspension mount).
– Checked load: prolonged severe overload operation.
– Checked road conditions: high-speed driving on rough roads.
– Checked material: insufficient steel plate thickness or strength.

Root Cause: The frame rail cracked at a weld heat-affected zone or stress concentration point due to long-term overload and operation on rough roads, exceeding the material’s fatigue limit.

Required Parts: Drill stop holes, bevel for professional welding repair, and add reinforcement plates.