How often does the coupling need to be lubricated?

This depends on how and where the coupling is used. We recommend lubricating the coupling at least once a month, and more frequently for heavy-duty use. Read more about this in the Driver's Manual.With VBG MechMatic, you never have to worry about lubrication, it is done completely automatically. In addition, the coupling is also automatically cleaned. This keeps the coupling in the best possible condition and extends its service life.