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How to maintain the excavator slewing bearing?

08-18, 2022 / in Bearing Knowledge / by LDB

The excavator slewing mechanism includes the following parts: slewing motor, reducer, slewing large ring gear, slewing center section and other components. In the daily operation, the daily maintenance of the excavator slewing mechanism should be done well, especially the excavator slewing bearing, otherwise the work efficiency of the excavator will be seriously affected.

Excavator slewing bearing maintenance

Under normal working conditions (working 8 hours a day), the slewing bearing is lubricated once every 100 hours of operation. Before filling the grease nipple or connecting pipe, remove the plastic plug or screw plug from the oil hole.

Lubricate once a week in tropical, humid, dusty, temperature-variable areas and in continuous operation. New grease must also be added before and after the machine has been stopped for a long time. The raceways must be filled with grease each time they are lubricated until a new oil ring is formed at the seal. When injecting grease, turn the slewing bearing slowly so that the grease is filled evenly.

When the excavator runs abnormally (flooded by water, running in mud for a long time, etc.), the slewing bearing should be maintained: inject the required amount of grease for the slewing bearing for the first time, and then inject half the amount every day for a week. The tooth surface should be cleaned of debris every ten days and coated with grease.

Excavator slewing bearing

Note: Because there are many factors in the comprehensive working conditions, users can choose the best original grease according to their specific requirements.

The hydraulic oil maintenance of the rotary motor can be maintained at the same time as the entire hydraulic system, and the hydraulic oil needs to be replaced every 2000 hours. The gear oil of the rotary reducer needs to be replaced once every 1000 hours.

In daily operation, we need to observe the liquid level of the gear oil of the rotary reducer from the dipstick. In some cases, abnormal loss of lubricating oil will be found. We need to open the observation port of the large ring gear (the bottom of the boom cylinder, the grease filling port) , check whether the lubricating oil leaks into the large ring gear cavity through the sealing ring of the rotary reducer.

There are common misunderstandings in the maintenance of slewing bearings. Many people think that the interval between buttering the slewing bearing is the same as that of the upper and lower arms, and it needs to be rubbed every day. In fact, doing so has a bad effect, because the lubrication cycle is too short, and there will be too much butter in the bearing, which will break the dust ring and leak out.

Leakage means that impurities will enter the inside of the bearing, causing abnormal wear of the bearing and abnormal operation. According to the maintenance standard, the lubricating interval of the slewing bearing is 250 hours. The excavator should be rotated while buttering, and the butter should be added every 15 degrees.

The rotating large turntable part includes the rotating large ring gear, reducer and other components. Usually, when we open the observation hole at the bottom of the boom cylinder, we can observe the lubrication and wear of the large ring gear cavity. With the use of the machine, the dustproof ring of the rotating gear ring will be aging. If it rains, the rainwater will seep into the large ring gear cavity along the leakage of the rotating gear ring, causing the turntable to accumulate water.

Because the butter in the cavity is diluted by water, the lubricating effect is not up to the standard, which will aggravate the wear of the ring gear. In addition, long-term soaking will cause rust and peeling on the ring gear, which will eventually lead to abnormal rotation. The most serious is the ring gear. invalid.

Excavator slewing bearing

The slewing bearing needs to be lubricated in the following cases:

1) After each cleaning, such as after spraying water or washing with washing equipment (steam jets or high-pressure cleaners are prohibited), etc.

2) Before and after stopping operation for a long time.

Therefore, the excavator should try to avoid rainy days, and park it in a sheltered place when parked. If it is found that there is water in the large ring gear cavity, we can use the excavator to go uphill or downhill to make the water flow out of the cavity.
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