Excavator EX200-5 main pump relief valve Hydraulic distribution valve YA00011313

Hitachi excavator excavates powerless fault repair
The hydraulic pump of Hitachi excavator is a plunger variable pump. When working for a certain period of time, the components in the hydraulic pump, such as the cylinder block, plunger, valve plate, swing, etc., will inevitably produce excessive wear, resulting in a large amount of internal leakage and uncoordinated parameter data, resulting in insufficient flow and high oil temperature, slow speed, and inability to establish high pressure, so the action is slow and the digging is weak. For such problems, it is necessary to remove the hydraulic pump, send it to the debugging department, test the hydraulic pump data, confirm the problem of the excavator, replace the parts that can no longer be used, repair the parts that can be used, reassemble the hydraulic pump, and then go to the debugging test bench to match various series of soft parameters (such as pressure, flow, torque, power, etc.).

Hitachi excavator hydraulic original multi-way distribution valve maintenance multi-way distribution valve above the main safety valve, secondary valve, jet valve, oil valve and so on. If these safety valves are not currently set to the standard pressure (the standard pressure of the EX200-5 main safety valve is 320kg, but the current pressure is only 230kg), the excavation will be weak. In addition, if the gap between the valve stem and the valve hole is too large due to wear, the valve stem return is not complete, resulting in insufficient flow and slow speed. For such problems, it is necessary to remove the multi-way distribution valve, send it to the company directly on the debugging platform for debugging, reset the pressure of all safety valves, and eliminate the gap between the valve stem and the valve hole.