The reasons of excavator moves slowly

Excavator action slow failure phenomenon:

1 Excavator hot car moves slowly, cold car is normal.

2 The excavator moves slowly in the morning.

Reasons for slow excavator action:

1. The excavator spare parts cold car is working normally, and the hot car is slow. Generally, the internal components of the excavator are worn out due to time (excavator cylinder, plunger, distribution plate, nine-hole plate, turtle back, etc.) As a result, the engine power of the excavator is reduced and the hydraulic system is leaked. In addition, if the excavator is not used for a long time, the cause of the slow operation of the excavator may be: short circuit of the excavator circuit fuse, pilot pressure Abnormal, servo control valve - servo piston stuck, distributor confluence, etc.. The speed sensor is broken or the sensor is faulty. The engine power is reduced, you can do the throttle correction. The hydraulic oil of the excavator has not been changed for a long time. The flow of the excavator did not meet the requirements.

2. The phenomenon of slow excavator movement in the morning may be caused by the weather, so that the engine oil of the excavator is solidified, so it is necessary to preheat before the work. It is also possible that the flow of the excavator is reduced, and all the excavator moves slowly. Phenomenon. Komatsu Excavator spare parts oil circuit problem, to check the pilot filter, oil return filter and oil filter. The main pump regulator of the excavator is faulty.

Excavator action slow fault repair:

1. Check the hydraulic oil and find the hydraulic oil. There is no problem. The pressure of the pressure reducing valve is up to 10kg/cm2. The internal copper filter is blocked after being decomposed. The hydraulic oil filter is clogged, the copper mesh is off, and the hydraulic oil tank has A lot of impurities. The pilot pump is normal. The hydraulic system is cleaned 3 times, the hydraulic oil is replaced, and the filter element can be used after repair because it has low damage. It does not need to be replaced.

2. The whole machine moves slowly: the triode of the pump No. 2 pump displacement solenoid valve is broken down in the pump valve controller (PVC), or the spool of the solenoid valve is stuck, which will cause slow speed. When the control No. 2 After the triode of the pump solenoid valve is broken down, the solenoid valve is not controlled by the computer, causing the hydraulic pump swashplate to be at a small angle, resulting in a slow moving speed. In addition, the spool of the No. 2 pump solenoid valve is dirty. When the card is in the extreme position, it is similar to the result when the triode is broken down, so that the servo piston is in the small end position, causing the action to be slow. The single action is slow: the pressure switch that controls a single action is faulty. This fault makes the control signal cannot be sent. To the EC, the motor can not be speeded up; at the same time, the EC can't transmit the signal to the PVC. The pump displacement solenoid valve (PDSV) can't increase the displacement, causing the single top to move slowly. The compound action is slow: the pressure sensor is faulty, the electromagnetic The proportional solenoid valve in the valve group is faulty, and the angle sensor (A) failure may cause the excavator to move slowly. Shandong Jinyao Engineering Machinery Co.,Ltd