380-9849 Excavator hydraulic pump proportional solenoid valve 172-2392

Proportional valve failure causes and solutions

(1) Proportional electromagnet failure
Due to aging, poor contact of the wiring socket [base] of the plug assembly and the welding of the electromagnet lead, the proportional electromagnet cannot work (can not carry current). At this time, the electric meter can be used to detect, if the resistance is found to be infinite, you can re-weld the lead, repair the socket and plug the socket firmly.
The failures of wire assembly include coil aging, wire burnout, internal wire breakage and excessive coil temperature rise
Phenomenon. The coil temperature rise is too large to cause the output force of the proportional electromagnet is not enough, and the rest will make the proportional electromagnet can not work
Do. For the coil temperature rise is too large, you can check whether the current is too large, whether the coil enameled wire insulation is poor, valve
Whether the core is stuck because of dirt, etc., find out the reasons and eliminate them one by one; For broken lines, burnt out and other phenomena, the line must be replaced
A surname
The main reason for the armature assembly is that the armature and the friction pair formed by the magnetic guide sleeve wear during use, resulting in the increase of the force hysteresis of the valve. There is a push rod guide rod and armature different heart, will also cause the force hysteresis increase, must be removed
Except.
④ Because the welding is not strong, or under the action of the proportional valve pulse pressure in use, the welding of the magnetic guide sleeve is broken
Crack, causing the proportional electromagnet to lose function.