Fault Phenomenon: LiuGong HBT100 ride is comfortable when cold. When driving on rough roads (operating temperature), the shock absorbers fail, the vehicle bounces excessively, and eventually fails.

Troubleshooting Process:
– Checked shock absorber exterior: no signs of oil leakage.
– Checked shock absorber rubber bushings: bushings intact.
– Checked suspension springs: springs not broken.
– Measured shock absorber damping force at operating temperature: found damping force disappears.

Root Cause: The internal oil in the shock absorber vaporizes due to heat, causing damping loss.

Required Parts: Shock absorber assembly.