Details: a Kobelco excavator deviates to the left when driving in a straight line. Let's analyze the causes and troubleshooting steps together
Analysis on the causes of the left deviation of the excavator during the maintenance of the traveling deviation of the excavator at shensteel:
1. The internal leakage of the traveling motor of the excavator is serious
2. Excessive internal leakage of excavator hydraulic pump
3. The valve element of the control valve on one side of the excavator is stuck or the spring is broken
4. The oil seal of the central rotary joint of the excavator is damaged
5. The balance valve of excavator travel motor is faulty
6. Excavator travel operating valve or travel pilot pressure sensor fault
The inspection process of the traveling deviation of the excavator of shensteel and the left deviation of the excavator:
1. Through parameter query on the display screen, check that the pressure of the front and rear main pumps is 34.3mpa, which is normal The forward and backward straight travel tests were conducted repeatedly. It was found that only when the vehicle was moving forward, there was left deviation caused by left travel weakness. Therefore, the internal leakage fault of the main pump and the travel motor could be eliminated
2. The left and right travel servo valves, pilot control pipes and main travel valves, as well as the left and right travel oil pipes of the central rotary joint, were exchanged one after another. The deviation direction did not change. Enter the display screen again for parameter query, and it was found that the current of the proportional solenoid valves of the front and rear main pumps was normal
3. Through the above analysis, it is basically determined that the traveling motor is faulty Check the traveling motor. It is found that the oil inlet throttle of the balance valve is blocked. After disassembly, clean it. After reinstallation, the whole machine works normally and the fault is solved
