Routine Maintenance and Inspection of Harmonic Drive Reducer

- Apr 03, 2019-

How to do the routine maintenance and inspection of harmonic reducers, we will discuss today.


1. Checking the Harmonic Grease


Turn off the power to prevent electric shock! Wait for the reducer to cool! 

Open the oil drain plug and take the oil sample. 

Check the viscosity index of the oil. 

If the oil is turbid, it is recommended to replace it as soon as possible.      

Check the oil level of the reducer with oil level screw plug, whether it is qualified to install the oil level screw plug.


2. Check the Oil Level of the Harmonic Reducer


Turn off the power to prevent electric shock! Wait for the reducer to cool! 

Remove the oil level plug to check if the oil is full. 

Install the oil level plug. 


3. Harmonic Reducer Oil Replacement


After the cooling, the viscosity of the oil increases and the oil is difficult to drain. The speed reducer should change the oil at the operating temperature. 

Turn off the power to prevent electric shock! Wait for the reducer to cool down without burning danger! 

Note: The gearbox should remain warm when changing oil. 

Place an oil pan under the oil drain plug. 

Open the oil level plug, ventilator and drain plug. 

Remove all oil. 

Install the oil drain plug. 

Inject new oil of the same grade. 

The amount of oil should be the same as the installation location. 

Check the oil level at the oil level plug. 

Tighten the oil level plug and ventilator.


Different lubricants of harmonic reducers are prohibited from being mixed with each other. The position of the oil level plug, drain plug and ventilator is determined by the mounting position. Their relevant positions can be determined by referring to the installation position map of the reducer.