Fault Phenomenon: Skyjack scissor lift when rising to 4 meters, the platform vibrates severely.

Troubleshooting Process:
– Checked hydraulic oil level: level too low.
– Checked scissor arm pins: pins worn, excessive clearance.
– Checked rollers: rollers cracked.
– Added hydraulic oil, replaced worn pins and rollers.

Root Cause: Worn scissor mechanism connection pins caused excessive clearance, leading to unstable movement.

Required Parts: Pin bushing set, rollers.