komatsu Hitachi Caterpillar Kato Kobelco Daewoo hyundai Sumitomo Sanyi Solenoid valve

How to determine the excavator solenoid valve is good or bad?

1. Determine whether the solenoid valve y2 is closed tightly. Remove the two oil pipes leading to the solenoid valve y2 at the motor, and block the two oil ports at the motor end with two plugs, and then operate the main winch mechanism. If it works normally, it indicates The fault comes from the solenoid valve y2 is not closed tightly; if it is still abnormal, you need to check its parts.

2. Determine whether there is a problem with the hydraulic lock. First adjust the two lock cylinders. If it does not work, remove the lock for careful inspection. If you can't find the cause, you can use the ready-made lock to do the installation test to find out the cause of the failure. . Because the hydraulic lock of the auxiliary winch is the same as that of the main winch, the lock of the auxiliary winch can also be borrowed, and the method of replacing the main winch one by one can be used to identify the quality of the main winch lock. If there is no problem with both locks, proceed to the next check.

3. Check how fast the brake signal oil is fed and broken. The r-622 and r-825 drilling rigs produced by Geotech. The flow of the signal oil can be adjusted, that is, the time for the main winch to release the brake can be adjusted. of. Therefore, for the two types of drilling rigs, the flow rate of the signal oil can be adjusted through the regulating valve. If the machine is still working abnormally, check whether the oil pipe of the brake signal oil is blocked.

4. If these inspection parts are normal, you can only continue to check and disassemble the brake to see if the brake piston moves smoothly in the working stroke, and repair or replace it according to the cause of the failure.