SOURCE: Motor runs but the drive drum that hold the sanding belt does not turn.
Instead of removing the drum, remove the belt and the cover over the gearbox. The gearbox cover is normaly fixed in place by screws around the drive pulley. There may be a couple of screws under the pulley, if so they can be accessed via holes in the pulley wheel itself. Check for worn or stripped gears. These gears can be replaced if need be, but if this is the case make sure you remove and clean out all the grease first and replace that aswell as it may contain bits of teeth that have come off the faulty gear. As far as I know belt sander drive rollers can not be removed without removing the drive inside the gearbox first.
SOURCE: need a manual for a Craftsman belt & circular sander
I found a PDF file on Sears.com website for the original manual for my belt / circular sander.
SOURCE: looking for a manuel for a makita belt sander model #9401
There is a black metal ******** one side that is actually a lever and with the tip of a screw driver or the like, pops out and releases the front roller.
SOURCE: TC5000 and after extended use I smell burning and
Just because it spins freely doesnt mean it cant have a shorted winding. Id send it back where it came from or at least replace the motor.
Testimonial: "The solution to my problem seems plausable. I will check with the manufacturer and inquire about obtaining a new motor."
SOURCE: broken drive belt on belt sander
My answer comes almost a year after the original question, but I'll post it anyway for those who end up here after a search.
Black & Decker no longer supplies drive belts for the BR400 sander, but you can get a replacement elsewhere if you know what to ask for.
The belt is a synchronous, single-sided "XL" series belt, and mine had 120XL031 printed on it. The belt width is 0.31in or 5/16in or 7.9mm. Its pitch (distance from tooth to tooth) is 0.20in or 1/5in or 5mm. Its total height is 0.09in, and tooth height is 0.045in. It has 60 teeth, making the total length 12in.
I found a replacement at sdp-si.com, part number A 6R 3-060031.
Look here for timing belts (inch), then narrow the search for single-sided, .200 (XL) pitch, 60 grooves, 5/16 width.
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