Couplings are generally adjusted for rotation balance before leaving the factory, but occasionally large balance deviations may occur during use. The rotation balance correction of the coupling is very difficult and expensive. Generally, it is necessary to perform balance correction only when the operation tolerance is very high. The allowable coupling unbalance degree of the system is related to the characteristics of the connected machine, and can be known by detailed analysis or experience. During operation, the alignment error between the two shafts can be reduced, and the transmission power and machine running time (including the life of couplings, bearings and oil seals) can be increased. When installing the coupling, it is generally recommended to cooperate with the manufacturer's target center point offset value to maintain the machine at a non-zero offset value. The purpose is to make the deviation due to temperature changes during actual operation. The shift value is maintained within an ideal range.

The maintenance of the coupling is generally relatively simple, the inspection items are as follows:
1. Visually inspect to confirm whether there are signs of wear or fatigue, and then clean the coupling.
2. If the coupling needs lubrication, check and replace the lubricating oil. Most couplings only need to be replaced once a year. The lubricating oil needs to be replaced once, but if it is used in harsh environments or special working conditions, lubricate 4. The oil may be changed every few months.
5. Record the maintenance work for each coupling and the maintenance date.

However, even if the coupling is regularly maintained, it may be damaged. The following are the reasons for the damage of the coupling under regular maintenance:
1. The coupling is not installed correctly
2. The coupling suffered deliberate damage
3. Improper selection of coupling
4. The use conditions exceed the original design specifications (such as excessive speed, excessive torque, etc.)

If you want to improve the life of the coupling, you need to understand the reasons for its damage before replacing the next coupling. The following are some possible situations when the coupling is abnormal:
1. Abnormal noise, including sharp abnormal noise or tremor
2. Severe vibration or swing
3. Lubricating oil leaks or becomes dirty, which may mean that the oil seal has been damaged