Don't go trying to change out the cap start onna 'count of there isn't any and you'll only make yourself crazy trying to find it. It's Repulsion/Induction and has brushes. This is a good thing because they guard against any of the magic smoke getting out.
That aside, take the oval (actually elliptical) access covers off the end of the bell and look inside. Underneath one you'll see a lock screw and a brush holder. On the brush holder there will be a letter L, a center line and a letter R. Dependent upon which way you want the motor to rotate you set it to R or L. Disregard the center line mark. It must never be spoke of aloud otherwise you could let out the magic smoke.
Back to the matter at hand. More than likely the lock screw has loosened and the brush holder has shifted slightly. Loosen the lock screw (or not dependent upon how loose it is already) and shift the bracket to where the R or L (in this case more than likely the letter most closest to the notch) align with the notch in the motor housing (towards the outside of the motor case. It should be just a case of shifting that to where it wants to be and you're set for the next forty years. You might have to go this way or that with it but it's not rocket science and besides, if you don't feel good about it there should be a competent motor man near you who will do it for an extremely small fee.
I don't know much about 'lectrical things and motors but I do know I love my R/I (Less Than A Horse) Unisaw motor.
UA100