I have a Milwaukee Super Hole-Shooter drill Catalog No. 1854-1. I bought it used years ago. I has worked well for me. I have replaced the amature and most of the gears in it through the years. I recently replaced 2 gears and it seems to be running hotter than usual. The front case behind the chuck has been heating up more than I think it should be. The rest of the case is fine. It sounds normal when running even under a load. I'm wondering if a bearing could be bad.