Fault Phenomenon: Volvo EC360 excavator control handle does not return properly, causing actions to continue or move automatically.

Troubleshooting Process:
– Checked handle: internal return spring broken.
– Checked mechanical structure: handle shaft stuck.
– Checked pilot valve: spool stuck.
– Checked harness: electronic handle wiring fault.

Root Cause: The mechanical return spring inside the pilot control handle is broken, unable to return the handle to neutral.

Required Parts: Replace pilot handle assembly or spring repair kit.