Fault Phenomenon: General manual pallet truck oil stain on the hydraulic cylinder outer wall.

Troubleshooting Process:
– Checked oil seal: seal damaged.
– Checked rod: rod scratched.
– Checked cylinder barrel: barrel has pinholes.
– Checked pressure: high pressure.

Root Cause: The hydraulic cylinder piston rod oil seal has failed.

Required Parts: Hydraulic cylinder oil seal repair kit.