On this particular drill, you cannot get into this motor or get parts for the motor. You will have to buy a new motor. The good news is the motor only costs $15.00. The motor part # is 629819-4. Here is a breakdown of the 6280D Makita Drill:
http://www.toolsandmachinery.com/index.php?cPath=2213_2262_2442_2484
Don- www.toolsandmachinery.com, February 2009