We should pay attention to the failure of high water temperature and high oil temperature of the excavator to avoid unnecessary things. A Komatsu 150-7 excavator has the failure of high operating water temperature.
A Komatsu pc70-8 excavator has been used for 8200 hours. Recently, the water temperature is high during hot work, and it has been repaired in many places, but it still hasn't been solved. The water tank and cushion have been checked, and the pump has just been replaced with swing, pump liner and column There is no smoke in the excavator engine now. I don't know how to repair it?
Phenomenon analysis:
1. Check the sealing of the engine rear cover of Komatsu excavator. If the sealing between the excavator water tank and the engine rear cover is not good, it will affect the air circulation and cause the high water temperature of the excavator
2. A radiator can be added and connected to the heater pipe of the excavator, and the small switch leads into the cab
3. Change a water tank with a larger volume.
Extended reading: how to repair the automatic throttle jump of pc70-8 excavator?
When a Komatsu pc70-8-3 excavator adjusts the throttle, there is no change in gear 3 and gear 4. Observe that the accelerator motor of the excavator sometimes rotates backward upward, and the accelerator motor will suddenly return to gear 3. Sometimes when the accelerator motor is added to gear 4, it will suddenly return to the flameout position After the excavator stalls, adjust the throttle gear. When it is in gear 3 to gear 4, it will suddenly increase the stroke, and then return to gear 3 or gear 1. Disassemble the motor and check that the gear has no signs of damage. There are no nylon teeth in the motor. They are all iron gears. What is the reason?
Analysis: first check whether there is a problem with the circuit and refueling motor? If there is no problem, the computer board of the excavator may be broken. Komatsu pc70-8-3 excavator is controlled by two computer boards. There is a problem with the small computer board The problem with the throttle potentiometer The potentiometer is in poor contact or the connector is in poor contact The door motor lacks magnetism and has no power Replace the sensor and motor.
