Cannot run sander without breaking the belt. Tried adjusting belt tension, but not sure how to adjust it so belt doesn't break a few seconds after turning on the machine. Belt was adjusted so that it did not run off the pulleys, so this is not the cause.
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yes ther should be a knob on the top front roller (top side) this should affect tracking , also make sure tension taker (lever for changing belt) Is fully off so that belt gets its full tension , if the belt doesnt get full tension it will walk side to side
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.
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.
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.
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.
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.
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.
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.