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How do I repair the incline on my treadmill?

sears Proform Trainer 420 model # 83124733.Incline won't work. How do I fix it?

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Manage My Life
I bought a used Pro-Form 775 EKG treadmill. All 5 wires (2 black, 2 red and 1 white) going to the incline motor were disconnected and the bolt connecting the incline motor drive shaft to the frame was gone. I have the wiring diagram and the user's manual, but neither show how the wires connect.
When I got it the shaft was about 1/2 way out. I connected the wires (guessing which order) and put a bolt to the frame the incline went all the way up and stopped. Now it will not go back down.
by Manage My Life
November 4th, 2010
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