Question about Hitachi 3 In X 21 In Belt Sander, 2 Speed, 8.7 Amp Model SB75

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My Hitachi Belt sander SB75 the sanding belt moves off rollers as soon as applied to work piece how do I stop this happening?

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There is a belt adjustment know on the side of the sander. Turn the adjustment know back and forth while the sander is running until it centers itself.

Posted on Jan 01, 2011

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I have put a new belt on my einhell belt sander I've adjusted it as advised but the belt still moves to the right


The two rollers need to be perfectly aligned and parallel to each other for the belt to rotate correctly.

Remove the belt again and check the two rollers to make sure that there is nothing stuck to them that would cause the belt to run off to the right. A piece of tape is enough to make one side of the roller a larger circumference which enhance the taper effect.

Now check the belt in case something has become stuck on the back of the belt that would cause the belt to run off to the right. Something like tape stuck to the back of the belt will decrease the internal circumference of the belt on one side and make the belt run off.

Finally, you may have to replace the bearings on the rollers as they may have become worn. You may want a power tool engineer to do this for you.

May 24, 2015 | Sander Tools & Hardware - Others

1 Answer

Craftsman 315.117150. The belt keeps sliding off, as soon as turned on and start to sand. It seems to be on correctly.


You need to adjust the tracking knob which is by the front handle that looks like a triangle head screw. Make sure the belt tension leaver is tight and the belt has enough tension on it. Quickly press and release the start switch and note the centering of the belt. It should be in the center of the bottom platen. If it is not, adjust the tracking knob and bump the switch again. If the belt is going in the wrong direction turn the knob the other direction. Once you are close the center of the platen, press the power switch to turn the unit on and lock the trigger. Firmly hold the unit vertically from the front handle. Fine adjust the tension knob to center the belt and make sure the belt is not hitting the case which will cause damage. You should be able to use the belt sander without the belt slipping off. Let the sander do the work, do not push down and limit the side to side motion. If the belt will not stay on then the belt is too large or the torsion spring needs to be adjusted to applying more tension on the belt and drive roller.

Mar 22, 2011 | Bosch 1274DVS 3" x 21" Belt Sander

2 Answers

The Belt of my craftsman 3x21 sander slowly moves off track.


There is a leveling (screw/knob) on the side of the belt sander. Turn it up and the belt will drift in one direction. Turn it downward and the belt will drift in the opposite direction. play with this leveling screw/knob until you reach a good balance and the belt will stop drifting.

Dec 04, 2009 | Craftsman 3 x 21" Variable Speed Belt...

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...

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

2 Answers

BELT SANDER ADJUSTMENT


Try removing the adjustment screws and applying some Teflon thread sealant. That should prevent the screws from turning on their own. Another thing you can do it check the pulleys with calipers and make sure it is still cylindrical. I have seen ones that become worn on one side. Finally, roughly check the belt tension on both sides and make sure they are approximately the same tension.

Good Luck!

Ben Steigerwald

Jan 11, 2009 | Tools & Hardware - Others

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

2 Answers

Belt slipping


I have a Ryobi sander with a belt slipping issue as well. The problem seems to be in the design, not on the user end. The drive barrel is made of a semi-hard, non-gripping material. Wood dust becomes a final release agent that breaks any grip that the barrel may have had.
To compound the problem, the more the belt slips the smother the underside becomes allowing for greater slippage.
I now know why this model was the least expensive unit. >.<

Jan 08, 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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