Due to the high frequency of use of the excavator, most operators often encounter abnormal phenomena such as abnormal rotation noise, sluggish rotation, and slow and weak movements during the construction process. There is no doubt that the above failures can only be stopped and repaired as soon as possible! The following case illustrates this problem.
Failure model: caterpillar 340 excavator
Failure phenomenon: Caterpillar 340 excavator suddenly appeared "excavator swing jitter" failure while working on the construction site.
caterpillar 340 excavator swing shake inspection process:
Go to the site to check, when doing the rotation action, there is a slight jitter when the rotation is just started, it is normal after about two or three seconds, and it also shakes two seconds before the handle returns to the neutral position to stop the rotation.Analyze the problem of the rotation motor
The motor cover found that the contact surface between the valve disc and the cylinder body was badly worn, which was the reason. The failure of the test machine after the replacement of the new parts was still the same. Then, the rotary motor was disassembled and inspected carefully. Test machine everything is normal.
caterpillar 340 excavator slewing jitter processing results: working normally after replacing the seal ring under the brake cylinder.
Failure analysis:
There is a gap in the seal ring, which makes the brake cylinder tightly sealed, and the brake release time becomes longer. The brake is not completely released when starting the rotation. Therefore, it will shake for a while when the rotation starts, and the brake time will become shorter when the rotation stops, delay The effect of the valve is not obvious, so it will shake.
