Fault Phenomenon: Caterpillar 793F mining truck body height is uneven, one side high and one side low, or height cannot be adjusted.

Troubleshooting Process:
– Checked height control valve: mechanical height control valve spool stuck.
– Checked linkage: height control valve linkage deformed or detached.
– Checked air lines: air bag supply/discharge lines clogged.
– Checked air bags: air spring air bag ruptured.

Root Cause: The suspension height control valve spool is stuck due to dust ingress or dried internal grease, unable to adjust air bag inflation/deflation based on load.

Required Parts: Clean or replace height control valve, lubricate linkage mechanism.