The excavator turns around and makes a clattering sound when it stops

Merritt excavator repair factory, Master Li analyzed.

There is an abnormal sound in the rotation, mainly to observe whether there is a sound in the continuous rotation of the whole circle or only when the rotation starts or stops, generally if there is a sound in a certain position when the whole circle of rotation is in a certain position, it is necessary to consider whether the pinion and the large gear ring are not broken teeth, if there is a sound when starting or stopping, it is generally not a problem, mainly the gap between the pinion and the ring gear of the modern excavator is a little large, the modern pilot operating system does not have a buffer device, and the impact force of starting and stopping is relatively large, Therefore, if there is a sound, the sound can be reduced by operation, and of course, it is also necessary to consider whether the connecting bolts between the slewing reducer and the upper frame are loose.

Hello dear! I am asking Mr. Xiao Liu is happy to serve you for Yuan Weisan: First of all, the hail wants to see the abnormal sound from the **, and the main possible problems are:

1. There are impurities or serious wear in the slewing support; 2. When rotating, the platform and other parts are interfering; 3. Hydraulic problems, may be the abnormal noise in the hydraulic pipeline, this analysis is more difficult, to hire professionals.

The mounting surface is uneven or the mounting bolts are loose.

When there is abnormal noise, it is necessary to determine whether it is because of the problem of installation operation, when the installation surface is uneven and exceeds a certain standard data, it will cause a gap in the raceway, resulting in abnormal noise.

In addition, when the pinion gear is not properly aligned, there may also be abnormal noise, and it will also cause the fault of broken teeth, in addition, when the installation bolt is loose, resulting in the elastic deformation of the slewing bearing, and the negative clearance is generated at the deformation position, and the bolt needs to be checked immediately and tightened as required.

There is an abnormal sound in the rotation, mainly to observe whether there is a sound in the continuous rotation of the whole circle or only when the rotation starts or stops, generally if there is a sound in a certain position when the whole circle of rotation is in a certain position, it is necessary to consider whether the pinion and the large gear ring are not broken teeth, if there is a sound when starting or stopping, it is generally not a problem, mainly the gap between the pinion and the ring gear of the modern excavator is a little large, the modern pilot operating system does not have a buffer device, and the impact force of starting and stopping is relatively large, Therefore, if there is a sound, the sound can be reduced by operation, and of course, it is also necessary to consider whether the connecting bolts between the slewing reducer and the upper frame are loose.

It may be that the rotary gear is broken, or the rotary brake is broken, all in the **rotator (cylindrical), the rotary platform should not have any problems, if the rotary platform rings, you put some butter to see if it will sound, if it still rings, it means that it must be broken in the rotation, don't open it again at that time, if you open it again, there will be a lot of broken things, because his lubrication is lubricated with hydraulic oil, and if it is broken, you still open, The iron or copper filings will flow with the hydraulic fluid, and then it will be troublesome, because my car has been damaged and repaired for 5 or 60,000 yuan.

The first is to see if the rotation is stable, if it is not stable, it is broken, if it is stable, it is natural wear.

Only the bearing factors are considered: impurities in the raceway can be caused by rolling elements, raceway wear, foreign matter ingress, insufficient lubrication, loose connecting bolts, etc.

I don't know what kind of abnormal noise the big brother is talking about? Is it the abnormal sound generated after the installation or the abnormal sound of the slewing ring itself before the main engine is installed??? I'm Roth Ed's assembler.

When there is an abnormal sound, it is necessary to determine whether it is because of the installation operation, when the installation surface is uneven, and the difference exceeds a certain standard data, it will cause a gap in the raceway, resulting in abnormal noise. In addition, when the installation bolt is loose, resulting in the elastic deformation of the slewing bearing, and the negative clearance of the deformation position, it is necessary to immediately check the Qingwu and tighten the bolt as required. Thank you for your trust, the above is my reply, I hope it can help you, I wish you a happy life

First of all. Are you sure it's a friction sound?

General rotary relief valve.

The sound of the overflow is also like a friction sound, but it is not friction. The swing relief valve will normally overflow when the swing is started and stopped. If the relief valve is faulty, such as stuck or the pressure set by the relief valve is too low, it may overflow the entire rotation and may sound like a friction sound.

The method of confirmation is:

1. Confirm whether there is a friction sound during the whole rotation or only when starting and stopping, and pay attention to the rotation to more than 180 degrees when confirming and then listen to the sound. If there is only a start and stop, it is normal, and the overflow is inevitable when the open slewing system of the excavator starts and stops (if the Japanese excavator system rotates and the boom lifts at the same time, it will not overflow when it rotates 90 degrees, which is a special energy-saving design. German giant mining machinery closed rotary system generally does not overflow.

If there is a friction sound throughout the whole process, it may also be that the relief valve is out of order, so change it from another car to try if there is still any sound, and then look at the following if there is still one.

Second, confirm whether there is a friction sound on the left and right rotation, generally the probability of failure of the two relief valves at the same time is low, and there is no difference between the left and right friction sounds, then the probability that this sound is a real friction sound is very high, so it may be that the slewing support butter leaks or the slewing support, slewing motor, and slewing reducer.

When the components are worn out, try some butter. If the butter is useless, then change a good relief valve from other normal cars, one side can be, and then detect whether there is a friction sound when the next side of the change, if there is still wear, it should be worn, and it will be disassembled to see. If it doesn't work, we have to analyze specific problems on a case-by-case basis.

You can't jump to conclusions.

3. If there is no friction sound on the left and right rotations, that is, there is no sound on one side and no sound on the other side, the probability of the failure of the relief valve is very high. Swap the left and right two relief valves to see if the direction of the friction sound has been changed, if it is replaced, it must be a problem with the relief valve, generally stuck or the spring setting pressure is too low, clean it if it is stuck, and if the setting pressure is low, you have to call professional maintenance personnel to adjust the lower pressure, and the adjustment method of different relief valves will be different.

Above, I hope it will be helpful to you