A car has 6380 hours of work of the Sany 230C excavator in the whole work, the car cold is normal, but in the hot car, on the vehicle holding car flameout work, can not work normally.

Failure inspection procedure:

Check 1: system pressure 32MPA, holding the car working pressure is reduced to 24MPA, unable to establish the normal working pressure

Check hydraulic oil 2: hydraulic oil is clean

Ask customers 3: hydraulic oil is changed, the original oil has been replaced, the customer has been in accordance with 500 hours to replace a hydraulic oil, but the replacement time is extended, nearly 700 hours before the replacement

Confirm fault:

By adjusting the power regulating screw of the main pump, it is found that no matter how to adjust, the power can not be reduced, and the fault is mainly stuck by the pump regulator

Failure cause:

Because of the extended use of hydraulic oil (equipped with hydraulic oil hammer can only use 500 hours), causing the hydraulic system pollution, the death card main pump regulator, the power to regulate the main pump running at high power, resulting in hot car. After digging out

Processing mode:

Remove the main pump after the inspection, cleaning, and then re install, and re adjust the power, until the normal work of digging machine (engine work three hours without my car and walk straight), after the completion of the maintenance.

After a small set of explanations, I hope you know more about excavator information.