Trouble phenomenon: A Komatsu S180 excavator that used 4700 hours to move forward or backward at the same time. The two walking rods pushed as much as they could not go in a straight line. Sometimes the track rotates on the spot, and the crawler cannot move. One side does not move.
Fault focus: Komatsu S180 excavator can not go straight, a bit off.
Failure analysis:
1. Connect other pilot oil to your walking and try to walk at the same time. Can you judge whether the walking pilot pressure is normal?
2. Then see if the back pressure of the excavator, that is, the pressure of the oil supply port of the rotary motor is normal?
3. The central oil separator has a problem
4. The hydraulic oil circuit is not clean, and tiny dirt blocks the damping hole in the middle of a small piston in the safety valve. The safety valve can be removed for cleaning to eliminate the blocking of the damping hole.
Failure inspection and analysis:
1. The pressure of the walking motor on the left and right sides of the excavator is inconsistent.
2. It is recommended to use a pressure gauge to detect the difference between the pressure values of the left and right walking motors.After the detection, he can increase the side of the safety valve with the lower pressure to eliminate the problem that the Komatsu S180 excavator cannot go straight.
3. If it is detected that the pressure values of the driving motors on the left and right sides of the excavator are the same, it may be that the flow rate of the plunger pump is different.
4. If the plunger pump flow is the same, the Komatsu S180 excavator cannot go straight.The cause of the failure is the linear control valve of the excavator.
