Question about Craftsman 0.5 amp 3D Sander

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I have an old 3 x 21 inch belt sander. I put on a new belt, but the belt tightening device is locked in the "open" position. How do I unlock it so it tightens the belt?

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  • 34 Answers

I have that same sander. Know what you mean. I usually end up using a hammer to trip the roller and get it to release by hitting the side(end) of the roller with the hammer. Good luck.

Posted on Aug 10, 2010

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Posted on Jan 02, 2017

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2 Answers

How to clean a clogged belt sander


I assume you mean you want to clean the belt itself? You can use a rubber stick made for this. It looks and smells like a giant pencil eraser, about 1 inch square and about 10 inches long. However, if the belt is clogged with melted paint, that won't do much - but a stiff wire brush works OK. If the wire brush doesn't work, get a new belt. You can avoid the melted paint buildup (or at least reduce it) if you keep the sander moving rapidly over the surface, and use a good quality scraper to remove as much paint as possible before sanding.
Good luck!

Sep 19, 2012 | Makita 9404 4'' x 24'' Belt Sander

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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.

Jun 13, 2011 | Black & Decker Garden

3 Answers

How do you replace he belt on a 7447 Sander


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.

Oct 10, 2010 | Black & Decker BR300 3''x18'' Belt Sander

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

2 Answers

The belt on the sander doesn't turn. The sander has power when plugged in and the motor runs when you press the button. But the Belt and track don't turn.


Likely the gear belt that drives the drive rollaer has failed. Either it is totally gone or the teeth in a spot have been destroyed and the motor is just spinning the sprocket in the belt. The belt is about 1/2 inch wide and is covered by a belt guard.

Jun 13, 2010 | Makita 3 x 24" Belt Sander

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

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.

Jun 19, 2009 | Dewalt DW433KT Heavy Duty 8 Amp 3 Inch By...

1 Answer

Porter Cable belt sander


try to rig the nozzle of a shop vac to the part where the bag would normally connect and run the sander simultaneously with vac for a few minutes and see if that helps

Jan 11, 2009 | Porter Cable 362 12 Amp 4 Inch By 24 Inch...

1 Answer

Sanding Belt Slips Badly


Check and see if the pulleys on the sander are not glazed this somtimes will cause the belt to slip. Give them a good cleaning. If this does not help there is a good chance the spring on the belt tensioner is weak and need changed.

Hop this helps

Jan 09, 2009 | Tools & Hardware - Others

1 Answer

Loose sanding belt


Hi, Consult your user manual for the instructions to install a new belt.  Follow these instructions selectively to tighten the belt tension. Here they are....  
CHANGING DRIVE BELT


  Using a phillips head screwdriver, remove the two screws
in the center of the pulley cover.
  Remove the cover.
  Raise sanding belt to the vertical sanding position.
  Next, loosen the hex head set screw. Raising the motor
pulley releases the belt tension.
  Remove the old drive belt.
  Fit the new drive belt on the drive pulley first and then on
the motor pulley.
  Test belt tension by squeezing the belt with your fingers.
  Adjust the belt tension with the hex head set screw until
there is about 1/4 in. (6 mm) of give.
  Tighten the belt tension nut securely.
Note: Excessive tightness on the drive belt may cause
increased noise and overload the motor. Excessive
looseness on the drive belt may cause the drive belt to
fail prematurely and make a severe chattering noise.
  Using a phillips head screwdriver, reinstall the pulley cover
and the two phillips head screws. Tighten securely.


Good Luck!  Middles

Jan 08, 2009 | Tools & Hardware - Others

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