Fault Phenomenon: Zoomlion ZLJ5500THB outriggers function normally when cold. After the outriggers are extended (operating temperature), the outrigger indicator light gives a false alarm, showing not fully extended, eventually preventing pumping.

Troubleshooting Process:
– Checked outrigger position switch: switch installed correctly, no looseness.
– Checked outrigger mechanical structure: outrigger fully extended, no deformation.
– Checked indicator light wiring: wiring intact, connections normal.
– Measured position switch signal at operating temperature: found signal intermittently cuts out.

Root Cause: Internal contacts of the outrigger position switch oxidize due to heat, causing poor contact.

Required Parts: Outrigger position switch.