The purpose of lubrication in electric motors is to reduce friction and internal wear and prevent overheating. The grease serves as a vehicle for the added oil, which does the lubricating functions.
The most frequent failure is not the lack of lubrication, but the excessive lubrication, made with a larger amount of grease than recommended.
Excessive lubrication raises the temperature, due to the great resistance that occurs in the movement of the rotating parts and mainly due to the grease beat, which ends up completely losing its lubrication characteristics.
This can cause leakage and penetrates the grease inside the engine and depositing it on the coils or other parts of the engine. The grease used in the motors 1125-5-100-A is polyurea grease specially developed for electric motor bearings.
This grease has good compatibility with conventional lithium greases, but it is not recommended to mix greases, and if you use another type of grease, consult the manufacturer.
For motors with shielded type bearings there is no need for relubrication since they have been factory lubricated for their normal life and use polyurea grease.