The excavator is one of the commonly used mechanical equipment in engineering construction. The slewing device is an important part of the excavator. It consists of a slewing platform, a slewing mechanism, a slewing bearing and other components. Whether the excavator can rotate left and right during work is inseparable. The credit of the slewing mechanism.

After the excavator has been working for a period of time, under the influence of the working load and the surrounding environment, there will be a phenomenon of inability to rotate. There are also several manifestations of inability to rotate, such as the sudden stop and sudden movement of the rotating platform of the excavator, and the low rotation speed of the platform. At 6r/min, slow power is insufficient, etc. What are the reasons for the inability of the excavator to rotate?

slewing bearing

1. The energy input to the hydraulic motor is reduced

When the rotation is weak, the hydraulic motor needs to be checked. The hydraulic motor converts the hydraulic pressure energy into mechanical energy output, so that the platform can be rotated. When the energy input to the hydraulic motor is reduced, it is difficult to overcome the rotational resistance of the platform, which will cause the situation to be weak or even stopped.

2. Failure of safety valve and oil filling valve

When there are problems such as the safety valve and the oil filling valve sealing, it will affect the speed of the excavator slewing platform. If these valves are worn, the valve core and valve seat will be squeezed by pressure, the sealing performance will be reduced, and the working pressure oil will leak from the oil charge valve, causing the excavator to fail to rotate.

3. The damping hole of the pressure limiting valve is blocked

Another point is that the pressure limiting valve orifice is blocked. Because the pressure limiting valve is often opened, the valve seat and valve sleeve are easily worn, and external impurities will enter the oil pump, causing the orifice of the pressure limiting valve to be blocked. When repairing the limit valve, carefully check the degree of wear, and it needs to be replaced if it cannot be repaired.

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