Excavator loader accessories rotary relief valve 410127-00095 hydraulic valve

Excavator repair Cummins diesel engine troubleshooting,1. When the start switch is turned to the closed position, the solenoid coil of the stop solenoid valve loses current, the suction disappears, and the valve plate of the stop solenoid valve closes the oil circuit under the thrust of the spring plate, so that the engine is turned off. If the solenoid valve is not tightly closed, it will continue to supply oil to the fuel passage, so that the oil pressure in front of the injector metering hole can not be timely reduced to the flameout oil pressure, resulting in flameout difficulties. If the solenoid valve is not tightly closed, the length of the extinguishing time is also different, which can reach tens of seconds to several minutes.
Fuel injector steel ball check valve seat is not solid, seal is not tight when the fuel injector steel ball check valve seat is not solid, seal is not tight, the steel ball check valve does not open, resulting in an increase in the oil pressure in front of the injector metering hole, resulting in difficult flameout. This fault is different from the above three faults, when the steel ball check valve of a cylinder injector is not firmly seated and is not tightly closed, only the oil pressure in front of the metering hole of this cylinder injector is affected, and other non-fault cylinders are not affected. If only 1 of the 6 injectors fails, only 1 cylinder is working when it is difficult to extinguish; If two injectors fail, two cylinders work, and so on. Because the fault is individual, it can be checked by "broken cylinder method" during inspection, or observe which cylinder is working after removing the exhaust pipe. However, the PT fuel system is not as easy to implement the "cylinder break method" as the Bosh fuel system. According to the author's experience, the tool can be used to lift the injector plunger drive rocker arm forcefully, so that it has been pressed on the oil cup, the plunger can not move, so that it can not measure the fuel, can not be injected to achieve the purpose of breaking the cylinder.