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Malfunction (1) The main spool does not move 1. Electromagnet failure (1) Electromagnetic coil burnout (1) Check the reason, repair or replacement (2) The electromagnet driving force is insufficient or magnetic leakage (2 ) Check the cause, repair or replace (3) Electrical circuit fault (3) Eliminate fault (4) Electromagnet does not add control signal (4) Add control signal after check (5) ) Check or replace 2. Pilot solenoid valve malfunction (1) Valve core and valve hole stuck (such as poor parts geometry; valve core and valve hole with too tight; oil too dirty) (1) to meet the clearance requirements (2) spring side bend, so that the slide valve stuck (2) to replace the spring 3. The main spool stuck (1) poor geometric accuracy of the spool and the valve body (1) Repair gap with the research to meet the requirements (2) spool and valve hole with too tight (2) Repair and research gap to meet the requirements (3) there is a burr on the spool surface (3) deburring, rinsing clean ) Control circuit oil-free 1) Control circuit solenoid valve is not reversed 1) Check the cause and eliminate Except for 2) the control oil is blocked 2) check the cleaning and make the control circuit smooth (2) control the oil pressure is not enough 1) the valve cover leakage 1) tighten the end cap screws 2) Throttle is too small or blocked 2) Clean the throttle and adjust it properly 5. Oil deterioration or excessive oil temperature (1) ) The oil temperature is too high, so that the parts have thermal deformation, resulting in stuck phenomenon (2) check the cause of the oil temperature is too high and eliminate (3) the oil temperature is too high, the gums in the oil, stuck stuck and stuck (3) Clean and eliminate oil temperature too high (4) Viscosity of oil is too high and make the valve core difficult to move and get stuck (4) Replace suitable oil 6. Bad installation 1) Uneven tightening torque of mounting screw 1) Tighten the screws and force them evenly. 2) The pipe connected to the valve body should be "re-energized." 2) Reinstall 7. The return spring does not meet the requirements (1) Excessive spring force Replace the appropriate spring (2) Deformation, resulting in the valve core stuck (3) can not reset the spring fracture (B) after the valve spool to flow through the lack of valve opening Insufficient (1) Solenoid valve putt is too short (1) Replace the appropriate length of the push rod (2) The spool and the valve body geometry accuracy is poor, the gap is too small, moving stuck phenomenon, it is not in place (2) Research to meet the requirements (3) the spring is too weak, the thrust is not enough to make the spool stroke is not in place (3) the replacement of the appropriate spring (C) pressure drop too large Valve parameters inappropriately selected Actual flow through the rated flow should be used within the rated range Fourth, the hydraulic control valve spool commutation speed is not easy to adjust Adjustable device failure (1) one-way valve closed poor (1) repair or replacement (2) throttle machining accuracy is poor, can not adjust the minimum flow (2) repair Or replacement (3) oil drain valve cover at the oil leakage (3) to replace the seal, tighten the screws (4) Needle throttle regulating poor performance (4) switch to triangular tank throttle valve (5) Coil burned (5) overheating or coil electromagnetism burnout (1) coil insulation is not good (1) replacement (2) electromagnet core inappropriate, unable to absorb (2) replacement (3) voltage is too low or unstable (3) The change of voltage should be within 10% of the rated voltage. 2. The load changes 1) Change the pressure more than the specified pressure (1) Reduce the pressure (2) Turn over the flow rate more than specified (2) Replace the electro-hydraulic valve with the correct specifications (3) Within the specified value 3. Poor assembly Poor electromagnet core and spool axis misalignment Reassembled to ensure good concentricity (6) Poor electromagnet attraction Poor assembly (1) Lever too long (1) Repair (2) Electromagnetic iron core contact surface is not flat or poor contact (2) Elimination of failure, reassemble to meet the requirements (VII) Shock and vibration 1. Commutation impact (1) large diameter solenoid valve, Due to electromagnet specifications, quick pull and impact (1) need to use large-diameter valve, should be preferred electro-hydraulic valve (2) hydraulic valve, the control flow is too large, spool movement Speed ​​too fast and impact (2) throttle throttle throttle to slow down the spool movement speed (3) one-way throttle check valve ball leakage or ball broken, can not afford damping (3 ) Repair one-way throttle 2. Vibration Fix the solenoid's screw to loosen the captive screw and Anti-loosening washer failure phenomenon analysis (1) the main spool is not moving 1. Electromagnet failure (1) electromagnet coil burnout (1) check the reasons for repair or replacement (2) electromagnet insufficient or leakage (2) Check the cause, repair or replace (3) Electrical circuit fault (3) Eliminate fault (4) Electromagnet does not add control signal (4) Check and add control signal (5) (5) Check or replace 2. Pilot solenoid valve fault (1) Valve core and valve hole stuck (such as poor parts geometry; spool and valve hole too tight; oil too dirty) (1) The gap to meet the requirements of the spool move flexible; filter or replace the oil (2) spring side bend, the spool stuck (2) to replace the spring 3. The main spool stuck (1) spool and valve geometry poor accuracy (1) repair and research gap to meet the requirements (2) the spool and the valve hole with too tight (2) Repair and research gap to meet the requirements (3) spool surface burr (3) deburring, rinsing clean Fault (1) Control circuit oil-free 1) Control circuit solenoid valve is not reversed 1) Check Cause and eliminate 2) Control circuit is blocked 2) Check and clean, and make the control circuit open (2) Control circuit pressure is insufficient 1) Oil leakage at the valve cover 1) Tighten the cover screw 2) Throttle on one side is too small or blocked 2) clean the throttle and adjust it properly 5. oil deterioration or high oil temperature (1) the oil is too dirty to make the valve stuck (1) filter or replace (2) the oil temperature is too high, so that the parts have thermal deformation, resulting in stuck phenomenon (2) check the cause of the oil temperature is too high and eliminate (3) the oil temperature is too high, Jamming (3) cleaning, to eliminate the oil temperature is too high (4) the oil viscosity is too high, so that the spool movement difficult and stuck (4) replace the appropriate oil 6 poor installation 1) ) Re-tighten the screws and force them evenly. 2) Connect the pipe to the valve body "Do not force". 2) Re-install. 7. The return spring does not meet the requirements. (1) Excessive spring force Replace the appropriate spring. Bending deformation, resulting in stuck valve (3) can not be broken spring break (B) After the valve spool to flow through the flow is not Valve opening is insufficient (1) Solenoid valve putt is too short (1) Replace the appropriate length of the push rod (2) The spool and valve body geometry accuracy is poor, the gap is too small, there is stuck stuck phenomenon, it is not in place 2) With research to meet the requirements (3) spring is too weak, the thrust is not enough to make the spool stroke is not in place (3) to replace the appropriate spring (c) pressure drop too large Valve parameters inappropriately selected Actual flow through the rated flow should be within the rated range (4) Pilot valve of hydraulic control valve is not easy to adjust the commutation speed Adjustable device failure (1) Check valve closed poor (1) Repair or replacement (2) Throttle valve processing accuracy is poor, can not adjust the minimum flow ( 2) repair or replacement (3) oil drain valve cover at the oil leakage (3) to replace the seal, tighten the screws (4) needle throttle adjustment poor performance (4) switch to the triangular slot throttle valve Iron overheating or coil burnout (5) electromagnet overheating or coil burnout (1) coil insulation is not good (1) replacement (2) electromagnet iron core is inappropriate, unable to absorb (2) replacement Or unstable (3) The voltage change value should be within 10% of the rated voltage 2. Change of load (1) Change over pressure (1) Reduce pressure (2) Reverse flow exceeds specification (2) Change the size of the electro-hydraulic reversing valve (3) Excessive back pressure at the oil return port (3) Pressure to make it within the specified value 3. Poor assembly Poor electromagnet core and spool axial mismatch Re-assembly, to ensure good coaxiality (six) electromagnet suction enough bad assembly (1) putter too long 1) Sharpen the push rod to the appropriate length (2) Electromagnetic iron core contact surface uneven or poor contact (2) to eliminate the fault, reassemble to meet the requirements (V) impact and vibration 1 commutation impact (1) To the valve, the electromagnet specifications, quick pull and the impact (1) need to use large-diameter valve, should be preferred electro-hydraulic valve (2) hydraulic valve, due to control flow is too large, Spool moving too fast and have an impact (2) throttle throttle throttle to slow down the spool movement speed (3) one-way throttle check valve ball leakage or ball crushing, can not afford damping Role (3) overhaul one-way throttle 2. Vibration fixed electromagnet screw loose fastening Nails, and add a lock washer