Question about Black & Decker BR300 3''x18'' Belt Sander

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How do you replace he belt on a 7447 Sander - Black & Decker BR300 3''x18'' Belt Sander

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To change belt:
1) Put front roller on floor and push down until roller locks back.
2) Put on new sand paper.
3) Loosen tracking screw until front roller is released.
4) With sander running, use tracking screw to center belt.

Posted on Jul 23, 2011

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You push in on the front wheel until it clicks. this will lock it in place and allow you to put the sandpaper on. To unlock push in again. Make sure the sander is unplugged.

Posted on Nov 22, 2010

  • ljcromer Jul 08, 2011

    What keeps the front roller retracted is the belt centering screw on the side of the sander. The screw drops into a small indent and holds the front roller. To easily release the front roller, just press the front roller away from the belt centering screw. It will move just a little and release with some force, so be careful to keep fingers out of the way.

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I have this model #7447 (No Release Lever), Easiest Way - Cut old belt off, then turn upside down (on your lap) use a long/heavy "flat blade screwdriver" - insert under the "top" molded ridge inside front cover, Hold handle and pull screwdriver back against front roller (to retract). Slide new belt onto rear roller AND front roller - "while you have it retracted". Run it and adjust "belt tracking screw" to center belt.

Posted on Sep 23, 2017

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Posted on Jan 02, 2017

  • 86 Answers

SOURCE: Routine Maintenance?

This is an older model tool, not many parts are available. The problem will continue if you don't address it. The reduction geartrain is "permanently" (not so much) lubricated from the factory with a heavy weight grease. With age, time and enough use these less-expensive gearboxes get hot and the heavier solids separate from the oil base, causing the oily smell you are experiencing and presence of oil.

If you are mechanically inclined; I attached a link to the exploded diagram, you can open the geartrain, clean all the old stuff up and if the heat wasn't because the parts are visibly worn; then use a moly-based bearing grease from your local autoparts store (comes in a can, looks like a waxy paste). Coat the teeth so the grease fills the tooth gaps, but don't get carried away. Re-assemble and you should be good to go.

Honestly, this is an inexpensive sander, Ryobi makes a value priced model that works great if you choose to replace it verse service it.

Here's the diagram link

http://www.blackanddeckerservicenet.com/Products/DocumentView.aspx?productid=18190&typeId=1379&documentId=1235

Posted on Mar 01, 2009

  • 2 Answers

SOURCE: How do I change the

To change the belt, you must release tension of the rollers by pushing the front roller straight back until you hear it click and lock in position to change paper. Remove old paper and replace with new paper. Make sure if new paper has directional arrows to install properly.
Now you must release the front roller to put tension on paper. To do this push the front roller from the side that has the adjustment screw. This will release the front roller and allow it to go back into position. Be careful as it pops back quickly and with some force.
Turn on sander and adjust centering of paper with adjustment screw found near the front and side of sander.

Posted on Jul 08, 2011

  • 302 Answers

SOURCE: Black & Decker 3X21

I have one of those and I just smack the front roller ahead with a brass or plastic hammer. I hit the movable bracket that the roller is attached to. It takes a pretty stout whack to do it though. hope this helps you

Posted on Jan 14, 2010

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2 Answers

I have a Black & Decker sander, model # 7447 and am having problems changing the sand paper.


The 7447 does not have a release lever. To change the belt, you must release tension of the rollers by pushing the front roller straight back until you hear it click and lock in position to change paper. Remove old paper and replace with new paper. Make sure if new paper has directional arrows to install properly.
Now you must release the front roller to put tension on paper. To do this push the front roller from the side that has the adjustment screw. This will release the front roller and allow it to go back into position. Be careful as it pops back quickly and with some force.
Turn on sander and adjust centering of paper with adjustment screw found near the front and side of sander.

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on Feb 02, 2014 | Bosch Belt Sander Drive Belt For Pbs 7a,...

1 Answer

How do I change the sanding belt on my 7447 belt sander


To change the belt, you must release tension of the rollers by pushing the front roller straight back until you hear it click and lock in position to change paper. Remove old paper and replace with new paper. Make sure if new paper has directional arrows to install properly.
Now you must release the front roller to put tension on paper. To do this push the front roller from the side that has the adjustment screw. This will release the front roller and allow it to go back into position. Be careful as it pops back quickly and with some force.
Turn on sander and adjust centering of paper with adjustment screw found near the front and side of sander.

Aug 27, 2010 | Black & Decker 3"x21"HD Vs Belt Sander

1 Answer

Black & Decker 3X21'' belt sander (#7447)- pushed front roller in to put on new belt, can't get it to spring back out. Jim in Flippin


I have one of those and I just smack the front roller ahead with a brass or plastic hammer. I hit the movable bracket that the roller is attached to. It takes a pretty stout whack to do it though. hope this helps you

Jan 14, 2010 | Black & Decker 3 x 21 In. Dragster Belt...

3 Answers

How do I release the lock on my Craftsman belt sander to lighten the belt. It's an old Model # 315.1172


I checked Searspartsdirect.com for that model number and they listed that number, but with an extra 0 at the right end. I couldn't find a belt release lever illustrated anywhere like that on my old Craftsman belt sander. On mine, you just flipped the lever either forward or back to release and tighten the belt. (still works great) There is a spring that pushes the front roller assembly forward when the lever is operated.

Dec 03, 2009 | Cars & Trucks

1 Answer

Broken drive belt


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

Jul 10, 2009 | Black & Decker BR300 3''x18'' Belt Sander

2 Answers

Belt won't stay on belt sander


Check first that you have retensioned the belt... i.e. when you removed the other belt, you would have had to pull on a spring-loaded lever to remove the belt tension before you added the new one... make sure the tension lever is flipped back in to ensure the new belt is tensioned...

Next, and the likely problem you are having, is belt tracking... There should be an adjustment knob up near the front of the sander near the front roller, either on top of the front part of the sander, or to the side near the front roller... When you turn this knob, it makes the belt track either left or right over the sander's base. This knob will allow your belt to run square and true and not spin off to one side...You need to adjust the tracking using this knob while the belt sander is running and with the new belt tensioned and in place, so turn the sander upside down, and power it on with one hand, then turn the knob with the other hand whichever way is needed to have the belt track square and in the middle of the rollers. Make small adjustments on the tracking knob to begin with. They can be sensitive at times.

That should stop your belt spinning off to one side.

Mar 18, 2009 | Black & Decker Tools & Hardware - Others

1 Answer

Routine Maintenance?


This is an older model tool, not many parts are available. The problem will continue if you don't address it. The reduction geartrain is "permanently" (not so much) lubricated from the factory with a heavy weight grease. With age, time and enough use these less-expensive gearboxes get hot and the heavier solids separate from the oil base, causing the oily smell you are experiencing and presence of oil.

If you are mechanically inclined; I attached a link to the exploded diagram, you can open the geartrain, clean all the old stuff up and if the heat wasn't because the parts are visibly worn; then use a moly-based bearing grease from your local autoparts store (comes in a can, looks like a waxy paste). Coat the teeth so the grease fills the tooth gaps, but don't get carried away. Re-assemble and you should be good to go.

Honestly, this is an inexpensive sander, Ryobi makes a value priced model that works great if you choose to replace it verse service it.

Here's the diagram link

http://www.blackanddeckerservicenet.com/Products/DocumentView.aspx?productid=18190&typeId=1379&documentId=1235

Jan 28, 2009 | Tools & Hardware - Others

1 Answer

BROKEN RUBBER BELT FOR BELT SANDER


Maybe you can use a linked belt to replace it. Check the width of the old drive belt, and give these folks a call: Lee Valley

Nov 14, 2008 | Tools & Hardware - Others

1 Answer

Belt sander adjustment


There should be a knob on the front of the sander which adjusts the front roller on the sander. If the belt runs off in the same direction each time try turning the knob as the sander is running and while watching the belt. If turning the knob one direction does not work try turning the other direction. If turning the knob does not have any affect on the way the belt tracks on the sander then you probably have a broken or missing part on the front of the sander. This may require taking the sander to a service center.

Sep 15, 2008 | Tools & Hardware - Others

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