Fault Phenomenon: SANY SKT105 wide body mining truck severe body shudder and loud impact sound when engaging forward gear.

Troubleshooting Process:
– Checked accumulator: transmission accumulator nitrogen leaked.
– Checked pressure regulating valve: transmission oil pressure adjustment too high.
– Checked clutches: clutch clearance too small.
– Checked oil quality: incorrect transmission fluid viscosity.

Root Cause: The transmission clutch accumulator bladder ruptured, losing its cushioning effect, causing the oil pressure to spike instantly during gear engagement and producing impact.

Required Parts: Replace transmission accumulator bladder or assembly.