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Sanding Belt Slips Badly

I have a Ryobi 4x36 Belt/Disc Sander, Model BD4600.
Even with a new SANDING belt, it slips or stops as soon as a piece of wood touches it. The yellow gear on the right changes the position of the belt on the roller, but does nothing to tighten it. I don't see any kind of adjustment to move the two rollers further apart to tighten the SANDING belt itself. There is a screw inside the lever mechanism that allows you to change the belt, but it doesn't seem to have any relationship to make the needed adjustment.
The solution?

Posted by on

  • David Ford
    David Ford May 11, 2010

    Does the sanding belt stop and the motor keep running? I read the complete manual for this tool and the tensioning lever is spring loaded to tension belt. Also on the belt there is directional arrow make sure it is on properly. My thought is that it might be the drive belt slipping therefore not putting enough power to the rollers to turn under pressure. The adjustment and proper adjustment for the belt is on page 11 of the manual. If you dont have one go to Ryobitools.com and type in your model number. You want to look at the first manual it has en.pdf in the line, the others are for different languages, be patient it takes them awhile to load.

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  • 154 Answers

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

Posted on Apr 14, 2009

1 Suggested Answer

mikeymiddles
  • 58 Answers

SOURCE: 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

Posted on Jan 08, 2009

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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 | Sanders & Sanding Blocks

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