Check for wobble on lower wheel. Make sure new tires are installed correctly& try to adjust tracking.
SOURCE: Porta Band saw blade jumps off
I had this problem on a used model 725 that I bought. Apparently the rubber tires on the drive wheels develop a bit of a memory after sitting for a while with tension on the blade. I tried cleaning the tires to no avail. Then I removed both tires, flipped them over and re-installed. Still not fixed. Then I put only one back to the original position and the problem was solved. Other than the frustration of trying several times, I was out nothing and I got quite proficient at taking the blade in and out. The saw has worked fine ever since. I hope this simple (and free) solution works for you.
SOURCE: Model #113.24201 The saw blades come off and take
It's not tracking correctly. I've not worked on one of those little saws since a shop mate had a black & decker model about 15 years ago, but I'm guessing there's a problem with the tires themselves. They are either not seating properly, causing the blade not to ride correctly, or the blade tension is all wrong, (or some combination of the two).
But I have never seen tires get pulled off by a mistracked blade; that alone sends up a big flag for me. There is another post I located with a similar problem with the same saw, so maybe Sears had some issues with some of the tires, but apparantly the forum that hosted it has taken it down, so I can't tell you what her results were.
I'd suggest, since you've gone through all the obvious, that you might get some quality replacement tires for a start, check the bearings on the wheels for play. If that doesn't help, you may have exhausted the capacity of that particular saw. I remember getting that little B&D dialed in occasionally, but it would only work for relatively thin cuts, and eventually we pretty much gave up on it and used it only for installations.
Good luck.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
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