Excavator loader main gun relief valve 723-40-50201

(1) Proportional electromagnet fault ① Due to the plug assembly wiring socket (base) aging, poor contact and electromagnet lead welding and other reasons, resulting in proportional electromagnet can not work (can not pass current). At this time, the 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. (2) The failure of coil components includes coil aging, coil burning, internal wire breakage and excessive coil temperature rise. 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. 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, whether the valve core is stuck due to dirt, etc., one by one to find out the cause and eliminate it; For broken wire, burnt out and other phenomena, the coil must be replaced. The main fault of 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 also a push rod guide rod and armature different heart, will also cause the increase of force hysteresis, must be excluded. ④ Because the welding is not strong, or the welding of the magnetic guide sleeve is broken under the action of the proportional valve pulse pressure in use, so that the proportional electromagnet loses its function.