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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
There is a screw that changes the angle of the roller to change the tracking of the belt... this is very sensitive and probably if you are having trouble is more a reflection of the belt quality then the sander...try different belts before you toss the sander... I have had one for years and love it... although the belt tracking is tricky sometimes anss your have to keep after it...
The adjust ment is very touchy only turn it maybe 1/8 turn at a time...
There is a tracking adjustment knob on the side of the sander--adjust one way or the other until it tracks properly. This is something that will change by itself as the sander is being used--check periodically.
Usually there is a knob with a screw imbedded with a spring around it that screws in and adjusts the "tracking" of the belt so it doesn't run off the side of the rollers. If you lose that screw, then teh belt will come off quickly.
There is an adjustment screw on the side of the sander that aligns the belt. Mine has a black plastic knob on it. If adjusting this does not help, remove the belt and check to see if it is making contact with the belt roller frame. The screw on mine was too long and I had to shorten it on a grinder. If you do this, take only a little at a time, a small adjustment will move the belt quite a bit.
The problem is that you have not set the adjustment properly. Back off the adjustment screws,slide on the belt and center it over both rollers, addust a little at a time both screws, after belt begins to tighten up stop adjusting. Turn the power switch on for about 1 second. Is the belt tracking? Adjust as necessary. Try the power again for longer and longer periods untill belt tracks in the center of the rollers. Tighten nuts to keep adjustment screws from backing out.
OK the belt tensioning mechanism is spring loaded. First what is the quality of the belts are they real flimsy or stiff. You say the rollers spin but my question does the rear roller still spin and the belt remain stationary. If so the rubber belt on motor is bad. I would take a look for excessive wear on the rear roller. Does the yoke mechanism snap forward or move slowly, look for a build up of sawdust in this area that might be restricting movement on the yoke. The wear plate in still good condition. One other thing on the belts are they directional? Do they have an arrow on the inside if so that has to point toward front of tool. I looked at a breakdown and could not see anything else to suggest. I never had this problem except with belts when I was at Makita.