Look at the schematics on this site..........disassemble machine.......take an adjustable wrench and locate the motor shaft and you'll find a flat spot somewhere on the shaft and put the wrench on it.........then go on the front side of the blower there should be a nut take a socket to it and make sure you're either holding the wrench on the motor shaft or have it lodged in a place that stays...........you may have to spin the blower wheel off in a reverse direction. good luck