I have an old Shopmate 4" belt sander, model 1503T0, that my dad gave me. I'm trying to replace the belt and I can't figure out how to release the tension. There is no obvious lever to pull in order to do so. Can someone help me? 
It is spring loaded. Press the front wheel in
Thanks. My brother gave mo one he found in a dumpster. Any idea what the adjustment knob on the left side does? It says IN & OUT.
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SOURCE: toothed belt bosch 1274 dvs
If I am correct, when holding the tool in the normal operating position there should be an oblong cover on teh left hand side nea the back of the tool. It should be held on with a screw. remove this cover and you can access the belt . MAKE SURE THE TOOL IS UNPLUGGED. the belt should pull off/push on with a bit of force. Turning the pulleys as you put it on will help it go on evenly. If it is too stiff, put the belt in some boiling water for a minute or two to soften it up a bit.
SOURCE: The belt slips off my Belt Sander
All sander will have two adjustments. The first is to release the sanding belt by retracting the position of one of the rollers. The second adjustment moves one of the rollers belt tension from side to side. The roller angular position is changed, sometime by a single knob or screw, and sometimes by two separate adjusting screws.
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: 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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