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Re: 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.
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the belt will be tight but the front wheel needs realigning with the drive pulley
there is a small lever of adjuster screw on the side that by moving it when the belt running you can get the belt back to run in the correct position
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.
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.
There is a lever on the side at the front right near the roller that you can use to release the spring tension on that roller (moving it slightly to the rear). Once the tension is released you can slip the sanding belt onto both rollers from the side. Release the lever and the spring will put tension on the belt to hold it in place. Use the knob on the left side to center the belt on the roller if it starts to slip sideways when in use.
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.
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.
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. >.<
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.