Fault Phenomenon: Genie SX-125 XC telescopic boom aerial work platform cannot switch to rough terrain mode, axles cannot lock.

Troubleshooting Process:
– Checked axle lock cylinders: cylinder internal leakage.
– Checked solenoid valves: valves stuck.
– Checked mechanical lock pins: lock pins seized.
– Checked sensors: sensor signal error.

Root Cause: The axle lock mechanical pins are seized or the hydraulic cylinders have internal leakage.

Required Parts: Axle lock cylinder or mechanical pin.