In most cases with these motors you can find replacements by just having some information from the existing motor. If you have the motor model and make most electric motor companies can cross reference it for you.If not you will need as much information as possible such as shaft length and size,type of key way,direction of rotation ( clock or counter clockwise) and type of mount. Granger is a great place for motors .Their Dayton line is a good and price well.Hope this helps.good luck.
I had to remove the hand wheel, upper drive pulley, and shaft when I replaced mine.
Loosen set screws and slide out shaft just enough to slip belt onto upper pulley.
Then realign pulley and tighten set screws.