This article describes the case of slow action of Case series excavator, and the boom lifting of Case series excavator is slow.
Specific details: When a 7000 hour Case excavator is loading yellow sand, it needs to increase the throttle when the bucket is full, but the boom rises very slowly. After the boom is lifted to the maximum, stop the engine and slowly lower the boom itself. After the shovel is full, the bucket cannot be lifted when it is not in place. The boom creaks when it is lifted
analysis:
If the lifting of the boom of Case excavator is slow, if both hot and cold cars are slow, the internal leakage of the boom shall be handled first. Generally, the internal leakage of the machine shall be handled in a timely manner. It is easy to pull the cylinder after a long time
Common causes:
The lifting boom of Case excavator is slow, which may be
1. The control valve core of the boom working device of the excavator is worn or stuck.
2. PPC valve of Case excavator fails.
3. Hydraulic problems.
Repair method:
The lifting boom of Case excavator moves slowly. When the engine is at high idle speed, fault inspection starts. Place the operating lever of the excavator's working device at the middle position, and measure the output pressure of PPC valve at 0; The output pressure of PPC valve is 2.7Mpa when the operating lever of the working device is in the operating position Suspect that the valve element in the control valve of the excavator working device is out of order, and check whether the valve element of the control valve is worn or stuck.
Through the above field fault inspection, it is finally concluded that the boom of Case excavator moves slowly? The cause of the fault is "hydraulic fault". Repair or replace the switch and then test the machine. The fault is eliminated
After revision:
Slow action has little to do with the circuit. It usually occurs in the hydraulic system. During the construction, when the boom of Case excavator moves slowly, we must contact the professional excavator maintenance personnel in time to solve the problem in time.
