Fault Phenomenon: BelAZ 7530 mining truck direction feels unstable at high speed, steering weak at low speed.

Troubleshooting Process:
– Checked spring: constant differential pressure spring inside the flow amplifier valve broken.
– Checked spool: spool lost positioning due to broken spring.
– Checked oil quality: oil contamination exacerbated wear.
– Checked pressure: steering pressure fluctuates.

Root Cause: The critical spring inside the steering flow amplifier valve broke due to metal fatigue, preventing the spool from maintaining a stable pressure differential and causing flow distribution loss of control.

Required Parts: Replace flow amplifier valve spring repair kit or valve assembly.