Check the power supply wiring is connected to the adverse or not → Rewiring and connectors;
Check whether the power supply voltage is within the scope of the work or not → Transfer to normal range;
Check whether the coil is connected or not → Re welding;
Coil short circuit → Replacement coil;
Whether the working pressure difference of inlet metering pump is appropriate or not →Adjust the pressure difference or replace the appropriate rexroth hydraulic valves;
Fluid temperature is too high → Replace the appropriate rexroth hydraulic valves;
There are impurities make the main valve core and the valve core card stucked → For cleaning, if there is a seal damage should be replaced the seal and installed filter;
The liquid viscosity is too large, the frequency is too high and the life has been reached → Replace products.
2.Rexroth hydraulic valves can not be closed:
The main spool or the seal of the moving iron core has been damaged → Replace seal;
Fluid temperature, viscosity is too high → Replacement of rexroth hydraulic valves;
There are impurities into the solenoid valve spool or moving iron core →Wash;
Spring deformation or service life has been reached → Replace spring;
Throttle hole balance hole plug → Timely cleaning;
Working frequency is too high → Replace products or updates.
3.Other conditions:
Internal leakage → Check seal for damage → Whether the spring assembly or not;
External leakage → The connection is loose or the seal is broken → Tighten the screw or replace the seal;
When power is a noise → The head fasteners loose, tighten;
Voltage fluctuations are not allowed within the range → Adjust the voltage;
Core pull impurities or uneven surfaces → Timely cleaning or replacement.
