Fault Phenomenon: SANY SW955 wheel loader operator feels severe cab vibration, seat loses damping effect.

Troubleshooting Process:
– Checked air bag: seat bottom air spring air bag ruptured and leaking.
– Checked air lines: supply line leaking or clogged.
– Checked height control valve: height control valve failed.
– Checked mechanical damping: mechanical spring fatigued and broken.

Root Cause: The air spring air bag of the cab suspension seat ruptured due to aging or puncture by a sharp object, unable to maintain air pressure and damping.

Required Parts: Replace seat air spring air bag.