Why does Center blade suddenly cut closer than other two? Everything seems even.

did you put blade in backward ?

is the blade loose?is the pulley key way sheared as well as the key on the flywheel

Dave, this could be caused by a couple of things.

One, the blade tension may be too low.

Two, and in conjunction with #1, the blade guide on the left side of the blade may need to be brought closer to the blade ( but without actually touching).

Three, is thee any blade damage that could be pulling the blade to the left? Try another blade and see what results you get.

If you need help determining if one or more of these issues are the problem you're experiencing, or if you need help making the adjustments, you're welcome to send photos of your machine and I can walk you through it.

DIYpro

Everything sounds and looks good but the cut is uneven. I would think the only possibilities are a freewheeling blade, or an upside down blade. Neither situation is rare. If neither of those is possible I think I would set the whole thing up on jack stands and make sure nothing is going akilter in the mechanism which raises and lowers the deck, one side could be hung up.

Is the exhaust clear all the way out? Unplug the range and see if the problem goes away, if so you may have a control problem that is keeping the fan operating at a very low speed.
Good Luck,
Gilshultz

if everything seems free, check to make sure deck is level. check for damaged or blockage under deck on the side thats not cutting proper.

check belts are tight and not slipping

It sounds like the blade is not going through the guides properly if the blade is being pushed away from the wood.

Your blade is facing and moving the right direction, I am assuming.

For now, it works only satisfactorily:
I applied alcohol to further clean both blades,
dried and then oiled them. There seemed to be a slight gap between blades;
the fabric was dragged into the gap instead of being cut.