Excavator swing mechanism abnormal sound inspection method

When an imported excavator swivels during a heavy load, three kinds of squeaks and squeaks are irregularly emitted. We use the acoustic wave detector to check the casing of the rotary motor, the casing of the rotary speed reducer, and the outer diameter of the rotating gear ring. The strongest sound is the slewing ring gear, but when measuring the speed reducer, there are also sounds.
We installed a pressure gauge on the main pump. When the excavator is heavily loaded, the pointer of the pressure gauge is shown to swing. When the sound is over, the pressure value of the gauge drops.
Our first step is to open the excavator to an open space. The purpose is to have space for the excavator to turn around, then straighten out the big arm and the small arm. The bucket is one meter high from the ground. Stop the engine and drain the excess pressure.
When the rotary motor tubing is not disassembled, the rotary motor fixing bolt is removed and the motor is removed from the speed reducer. The requirement is that the motor spindle be separated from the center gear sleeve of the rotary speed reducer by a small distance and fixed. The engine was started and the motor was operated for rotation. Since the slewing motor was detached from the slewing speed reducer, the motor was idling in the forward and reverse directions, and the motor was operated smoothly without any abnormal noise. It was proved that the slewing motor had no failure and the motor was separated from the excavator.
The second step is to use the person to push the bucket (the bucket has left the ground) to allow the rotation of the excavator to move around. The person on the plane will judge whether the abnormal sound is from the rotary speed reducer or the slewing ring. . The result is that both items have different sounds.
Remove the reducer from the excavator and check that the bearing on the spindle end has been damaged. Abnormal noise is emitted from the bearing.
The third step is to use a person to push the bucket. The excavator slewing ring still has a strange sound. Before disassembling the slewing ring gear, close the dismantled tubing and start the engine. Return the excavator to the upper part of the detachable excavator. attitude. We separated the slewing ring gear from the excavator and disassemble the inner and outer ring gears to see the hardened layer of the rolling surface fall off.
The fourth step is to send the slewing ring gear to a professional bearing factory. After grinding the raceway according to the enlarged ball size, the quenching is performed again. The repaired slewing ring gear is returned to the excavator, and everything is normal.