Why does my Hitachi ZX30U-2 Excavators have insufficient power in all actuators?
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gainesshaneSep 10, 2025
If your Hitachi Excavator has insufficient power in all actuators, it could be due to insufficient engine power, so inspect and repair the engine. An excessively worn hydraulic pump could also be the cause, so replace it. Main relief valve failure is another possibility; re-adjust the pressure setting or replace the valve. Low hydraulic oil can cause this issue, so add hydraulic oil. Finally, a suction filter restriction could be the problem, so clean or replace it.
W
William LongSep 12, 2025
Why does my Hitachi Excavators have insufficient swing power?
K
Kara WellsSep 12, 2025
If your Hitachi Excavator has insufficient swing power or jerky upperstructure swing, it could be due to hydraulic pump performance drop, so replace it. A low pressure valve setting could also be the cause, so adjust the pressure setting or replace the valve. Swing motor performance drop is another possibility, so replace the swing motor. Swing bearing seizure can also cause this issue, so lubricate or replace the swing bearing. Foreign matter sticking in the brake valve might be the problem, so clean the brake valve. Finally, an oil leak inside the control valve could be the issue, so replace the control valve.
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