Fault Phenomenon: Niuli manual hydraulic pallet truck when pumping the handle, the forks cannot lift, handle feels no resistance.

Troubleshooting Process:
– Checked hydraulic oil level: level too low.
– Checked release valve: release valve not tightened.
– Checked pump seal: pump seal failed.
– Checked check valve: check valve ball stuck.

Root Cause: The hydraulic pump check valve ball is stuck or the seal has failed, preventing pressure build-up.

Required Parts: Manual hydraulic pump repair kit.