Due to the high frequency of use of excavators, most of the excavators often encounter such fault phenomena as abnormal rotation sound, rotation jamming, slow and weak movement during construction. There is no doubt that in case of the above fault, they can only stop and repair as soon as possible! The following case illustrates this problem.
Faulty model: CAT 340 excavator
Fault phenomenon: when CAT 340 excavator was working on the construction site, it suddenly appeared the fault of "excavator rotation shaking"
Troubleshooting process for rotation shaking of CAT 340 excavator:
On site inspection showed that during the slewing action, the slewing just started with slight shaking, which was normal after about twoorthree seconds, and it also shook two seconds before the handle returned to the middle position to stop the slewing Analyze the problem of the swing motor, disassemble it
It is found that the contact surface between the valve plate and the cylinder block is severely worn on the motor cover, which is the reason The failure of the test machine remains after the replacement of new parts Then disassemble the slewing motor and check it carefully. It is found that there is a small gap in the sealing ring under the slewing brake cylinder. After replacement, the test run is normal
Handling result of rotation shaking of CAT 340 excavator: it works normally after replacing the sealing ring under the brake cylinder.
Fault analysis:
There is a gap in the sealing ring, which causes the brake cylinder to be poorly sealed, and the brake release time becomes longer. When starting the rotation, the brake has not been completely released Therefore, it will shake for a while when turning to start, and the braking time will be shorter when turning to stop. The function of the delay valve is not obvious, so it will also shake.
