Hi, my name is Matthew Christian from Tampa, Florida and on behalf of Expert Village today I'd like to talk to you about a portable electric sander. Good maintenance is good practice with any power tool. No, most portable electric sanders do not require much maintenance aside from emptying the bag. You may want to clean the unit from time to time. They do tend to accumulate dust. It also will tend to build up inside the motor housing and again an ideal way to get this cleaned would be to use a air compressor if you have one available and an air blower. And, just stick your nozzle in various orifices here and there and blow it out to get rid of some of the excess built up dust. Another thing you should do from time to time is inspect your electrical cord. Make sure there are no cuts or frays in the cord. This would be beneficial to help prevent, make sure you don't get electrocuted while you are working. But it is good from time to time to check your cord. But, other than that there is not much maintenance for a portable electric sander.