Fault Phenomenon: JLG 800S telescopic boom aerial work platform steering suddenly becomes heavy, no power assistance.

Troubleshooting Process:
– Checked belt: belt broken.
– Checked fluid level: level low.
– Checked pump: pump damaged.
– Checked cylinder: cylinder internal leakage.

Root Cause: The steering pump belt is broken, causing the pump not to work.

Required Parts: Steering pump belt.