Excavator solenoid valve TM82002 hydraulic pump proportional solenoid valve TM1022381

Common fault points of solenoid valve

1. The solenoid valve does not work normally after being energized

Check whether there is a bad link in the power cable → Reconnect the cable to the connector.
Check whether the power supply voltage is in the ± operating range -→ normal position range,
Whether the coil is unwelded → re-welded,
Coil short circuit → Replace coil,
Whether the working pressure difference is inappropriate → Adjust the pressure difference → or replace the appropriate solenoid valve,
The fluid temperature is too high → replace the appropriate solenoid valve,
Impurities make the main valve core and moving core of the solenoid valve stuck → clean, if the seal is damaged, replace the seal and install the filter.
The liquid viscosity is too large, the frequency is too high and the life has reached → replace the product.

2, the solenoid valve can not be closed
The seal of the main spool or iron movement core is damaged → Replace the seal,
Whether the fluid temperature and viscosity are too high → replace the solenoid valve of the opposite port,
Impurities enter the solenoid valve spool or moving core → for cleaning,
Spring life is up or deformed → replaced,
Choke hole balance hole blockage → timely cleaning,
The working frequency is too high or the life has reached → change the product or update the product.

3. System pressure can't go up at all

Reason 1:
① The main spool damping hole is blocked, such as the assembly of the main spool is not cleaned, the oil is too dirty or the assembly with debris;
② Poor assembly quality, poor assembly accuracy during assembly, poor adjustment of the gap between valves, the main spool stuck in the open position, poor assembly quality;
③ The main spool reset spring is broken or bent, so that the main spool can not be reset.
The solution:
① Disassemble the main valve cleaning damping hole and re-assemble;
② Filter or replace the oil;
③ Tighten the valve cap fastening screw to replace the broken spring.

Cause 2: The pilot valve is faulty
① The adjusting spring is broken or not loaded,
② Taper valve or steel ball is not installed,
③ The taper valve is broken. Solution: Replace the damaged parts or replace the parts to restore the pilot valve to normal work.

Cause 3: The remote control port solenoid valve is not powered on (normally open) or the slide valve is stuck
Solution: Check the power line to see if the power supply is connected; If normal, it indicates that the slide valve may be stuck, and the faulty parts should be repaired or replaced.