3. mucking machine is powerless
The mucking machine is a typical failure of excavators. For excavation weakness, it can be divided into two situations: the excavation is weak, the engine is not braked, and the load is very light; the other is excavation weakness. When the boom or the stick reaches the end, the engine is seriously braked or even turned off.
1) mucking machine excavates powerless but the engine does not brake. The magnitude of the digging force is determined by the output pressure of the main pump. Whether the engine is braked depends on the relationship between the absorbed torque of the pump and the output torque of the engine. The engine does not brake, the oil pump absorbs less torque and the engine load is light. If the working speed of the excavator is not significantly abnormal, the output pressure of the main pump, that is, the system overflow pressure, should be checked. If the measured value of the overflow pressure is lower than the specified value, it indicates that the overload relief valve setting value of the hydraulic circuit of the mechanism is incorrect, which causes the mechanism to overflow prematurely and work weakly. You can adjust the machine by turning the adjustment screw.
2) mucking machine digging powerless, engine brakes. The engine brake indicates that the absorption torque of the oil pump is greater than the engine output torque, causing the engine to be overloaded. This type of fault should first check if the engine speed sensing system is normal. The inspection method is similar to the engine inspection method described above. After the above detailed inspection and troubleshooting, the engine speed sensing system returns to normal function, the engine braking phenomenon disappears, and the digging force will return to normal.
4. common faults in the mucking machine operation
Mucking machine often has some common faults in construction work, such as: the excavator is running away, the reason may be damage to the walking distribution oil seal (also known as the center rotary joint oil seal); the flow rate of the two hydraulic pumps is not; the side travel motor has problem. The rapid discharge of the hydraulic cylinder may result in the closure of the relief valve, or the serious damage to the cylinder oil seal.
5. mucking machine daily maintenance In order to prevent the failure of the excavator, in the daily use process, you need to pay great attention to the maintenance of the mucking machine.
Daily maintenance includes checking, cleaning or replacing the air filter; cleaning the inside of the cooling system; checking and tightening the track shoe bolts; checking and adjusting the track back tension; checking the intake heater; replacing the teeth; adjusting the bucket clearance; Cleaning liquid level; checking and adjusting air conditioning; cleaning the floor of the cab; replacing the crusher filter (optional). When cleaning the inside of the cooling system, after the engine is fully cooled, slowly loosen the water inlet cover to release the internal pressure of the water tank before releasing the water; do not perform cleaning when the engine is working, the high-speed rotating fan may cause danger; when cleaning or replacing the cooling When parking, park the machine on a level surface.
