How to change brushes on a Black & Decker 7450 belt sander

I have just checked four suppliers and the story is the same with them all - the parts you require are obsolete.

Surplus or used spares from ebay would seem to be your best chance unless you have a huge stroke of luck.

Gears mostly are so expensive as new spare parts as to make a new machine seem attractive.

Probably not.
It may have just had a part break inside, like the on-off switch, or one of the wires to one of the brushes, etc., etc.
I buy these regularly, and they are inexpensive, which also means they are made of inexpensive ( cheap) parts.
It wouldn't hurt to take it apart, knowing it may not be repairable. Sometimes parts are available on-line.
Be blessed.

Here s one Black Decker Belt Sander 7496 User Manual

The dust bags on most sanders are only marginally effective. They work OK on random orbit sanders with the holes in the sanding pad, but are next to useless on belt sanders. You might try attaching a vacuum cleaner hose instead of the bag. On the other hand, if the the belt is clogging up, that's not going to be helped by attaching a vacuum hose. The belt is "loading" up probably because the material you are sanding is damp, or maybe you are sanding paint, which tends to melt then stick to the belt. If you are just trying to keep the belt from clogging (or unclogging it), rather than keeping the dust contained, try running the belt against a wire brush after every couple of minutes. Good luck, Al K

if you do not find it, you could change one of the pulleys, with one of greater size, of course this will affect the speed, but is an alternative.

You might try Dewalt. I have a Black & Decker weed eater that had a broken belt and I had to order it from Dewalt. I was told that they had some kind of merger. Ordered it and it worked just fine.

Black & Decker Mouse Sander Manual that can be downloaded

Take the broken belt to an industrial supply house or Ball Bearing supply house for a replacement.

This is a good sander but no portable belt sander is really a floor sander.

First try Black & Decker Serves Department. At some Hardware stores (ACE, True Value, etc)they stock brushes in the back room.