Fault Phenomenon: Terex RT rough terrain crane steering wheel is very heavy when driving at low speed.

Troubleshooting Process:
– Checked steering fluid level: normal.
– Checked steering pump belt: belt slipping.
– Checked steering priority valve: spool stuck, flow cannot be prioritized to steering.
– Cleaned or replaced steering priority valve.

Root Cause: The steering priority valve failed, resulting in insufficient flow to the steering system.

Required Parts: Steering priority valve assembly.