The excavator is one of the common faults of the excavator. In the mreiter repair factory, the maintenance experience of a hundred cases of the excavator is ended, to share the common reasons for the excavator to hold the car and the way of the excavator to hold the car.
Fault performance:
The excavator is called "excavator holding machine", "excavator boring car" "excavator boring machine" and so on. It mainly refers to the sharp drop of the engine speed of the engine in the condition of force, causing the engine to extinguish or to stop the excavator.
High incidence type:
1 second hand excavator
2 use time long excavator
3 failing to maintain the excavator regularly and regularly according to the requirements.
4 do not operate the excavator properly according to the instruction manual.
Fault manifestation:
1 excavator cold car
2 excavator hot car suffocating
3 excavator cold car hot car all hold back car
Cause of failure:
Failure cause of 1 excavator cold car
The diesel oil used by the excavator is not correct. The viscosity of the diesel is very cold, the fuel supply can not work properly, and the fuel supply is insufficient.
The engine load or engine speed is not enough.
The voltage value of the PRV solenoid valve of the excavator is not enough.
The pump pressure of the excavator is not right.
The clearance of the engine valve of the excavator is too large / too small.
Reasons for the failure of the 2 excavator hot car
If there is a hot car in the use of the excavator in the use of the phenomenon, the first need to observe whether the excavator has black smoke? If there is black smoke that the excavator oil road, oil pump, engine intake, engine three filters and other problems may have problems, need to be examined in detail. If no black smoke, the common reasons for the excavator hot car hold car failure are the following several points:
After the oil temperature rises, the hot car can hold back. It may be that the oil of the excavator is deteriorating or too dirty, and the leakage or internal leakage in the hydraulic system occurs.
The car is usually accompanied by the engine speed down phenomenon, at this time to see the engine specific rotation speed? Generally turned 200 is normal, more than 200 can cause the phenomenon of suffocating, if the engine is caused by the speed of suffocating failure, the need to adjust the engine power to match the power of the hydraulic pump, troubleshooting.
The hot car of the excavator can also be caused by the hydraulic system failure. The common reasons are: the pump power is too large, the pump adjuster is worn, the pressure flow of the pump valve group is too large, the internal component of the pump is worn, and so on.
Reasons for the failure of the 3 excavator cold car hot car
Excavators, either cold or hot cars, often hold a second hand excavator or use a longer time excavator, which causes the failure of the excavator, which causes the failure of the excavator for a long time without oil changing or excavator breaking the hydraulic oil too fast, the diesel pump of the excavator (high pressure oil pump) and the engine power over the excavator. Large, excavator pump valve group pressure flow is too large, the disc wear and so on.
