1. The excavator cannot be successfully converted to idle speed at high speed.
2. Komatsu PC215-10M0 excavator operates at high speed, and cannot reduce the engine speed, nor can it switch the high speed to idle speed (1000 rpm).
Failure site inspection and analysis:
1.Check whether the same phenomenon occurs when the idle pressure switch (working / walking) mode is switched between each other.
2.Check whether the touch idle speed is normal.
3. Check the filter: visual inspection is normal.
4. After replacing the idle pressure switch, observe whether the same phenomenon exists. Supplement: The idle speed switch is entered by the normally closed type oil pressure to increase the number of revolutions.
5. The newly replaced idle speed switch is bad, and it works normally after the second replacement. Supplement: normally closed type must enter the pressure (RCV work) pressure switch to open, and send a signal to the CPU (5V) to increase the engine speed. When the pressure switch is automatically connected to switch to the idle state.
6. The same phenomenon also occurs when replacing the idle pressure switch, which is mistakenly judged as CPU failure. Replace the CPU, but the failure has not been eliminated.
Failure site repair method:
Replace the new idle speed pressure switch to work normally.
Komatsu PC215-10M0 excavator can not change the speed of the work process is going on? What should be paid attention to when repairing.
1. The idling pressure switch must first detect whether the resistance / voltage is normal.
①Measurement voltage: 5V when hydraulic work, 0V when 0 gear.
②Measurement resistance (measure the two contact resistances of the pressure switch after removing the connector): ∞Ω when hydraulic operation, 0Ω at 0 gear.
2. The idling pressure switch operates in conjunction with the walking working device, so any of the two problems cannot be converted to the idling state.
