Fault Phenomenon: General hydraulic forklift when the control handle is in neutral, the cylinder moves on its own.

Troubleshooting Process:
– Checked spool: spool worn.
– Checked spring: spring broken.
– Checked fluid quality: fluid dirty.
– Checked machining: low precision.

Root Cause: Wear of the multi-way valve spool causes internal leakage and cross-communication.

Required Parts: Multi-way valve assembly or spool repair kit.