The Komatsu PC70-8 excavator used 8200 hours. The water temperature has been high recently. It has not been solved after repairing a lot of places. The water tank and the mat have been checked. The pump has just changed the swing and the pump. The excavator. The engine is now smokeless, I don't know how to repair it?
Phenomenon analysis:
1.Check the seal of the Komatsu excavator engine rear cover.If the excavator water tank and the engine rear cover are not well sealed, which affects the air circulation, it will also cause the phenomenon of high water temperature of the excavator.
2. A radiator can be installed, connected to the heater air pipe of the excavator, and the small switch lead enters the cab.
3. Change a water tank with a larger volume.
Extended reading: How to repair the automatic throttle shift of the PC70-8 excavator?
When adjusting the throttle of a Komatsu PC70-8-3 excavator, the 3rd and 4th gears did not change. Observe that the throttle motor of the excavator sometimes lags upward, the throttle motor will suddenly return to the 3rd position, and sometimes the throttle motor is increased to 4 The gear will suddenly return to the flameout position. After the excavator is turned off, adjust the throttle gear. When the gear is from 3rd to 4th, the stroke will be increased suddenly, and then return to the 3rd gear position or the first gear position. Signs, there are no nylon teeth in the motor, all are iron gears, what is the reason?
Analysis: First check whether there is any problem with the circuit and the refueling motor? If there is no problem, it may be that the computer board of the excavator is broken.The Komatsu PC70-8-3 excavator is controlled by two computer boards, and the small computer board has problems. Throttle potentiometer problem. Poor potentiometer contact or poor connector contact. Door motor lacks magnetism and no power. Change sensor and motor.
