Fault Phenomenon: SANY SKT90 wide body mining truck after tilting the cab for maintenance, it cannot be locked in the original position, or the cab feels loose while driving.

Troubleshooting Process:
– Checked hydraulic lock: tilt cylinder bi-directional lock internal leakage.
– Checked mechanical latch: mechanical safety latch not engaged or worn.
– Checked cylinder: cylinder internal leakage causing sinking.
– Checked operation: attempted to lock before fully lowered.

Root Cause: The hydraulic lock spool in the cab tilt mechanism is worn with internal leakage, or the mechanical safety latch is worn and cannot engage effectively, resulting in unreliable cab fixation.

Required Parts: Replace hydraulic lock assembly, repair or replace mechanical latch.