I own the same treadmill and lost the incline as you describe. I toubleshooted(?) the condition and found that the nylon gear (28,81 or both) was stripped. I ordered a replacement for a few dollars and installed it. Work carefully and be prepared to get greasy as you will need to disassemble the elevation motor (item 30). See link below for the exploded view assembly and parts list.
http://sportsartamerica.com/saf/support/technicalsupport/diagrams/3100.pdf
SOURCE: My Proform treadmill will not incline. It is stuck
My proform treadmill is stuck on the highest incline (10) and it doesn't budge from there..Help my workouts are killing me!
SOURCE: Nordictrack motor will not run when start button is pushed.
Likely the cover of one of the motor brushes popped off. Unplug the machine before you pop it back in place, then try it again.
If that doesn't work, most likely it's the motor control board, or possibly the console, or finally just a loose connection behind the console.
But most likely, it's the motor brush cover. I've been seeing that alot with this model.
SOURCE: My treadmill will not incline. when you press the
Wondering if you found a solution to this problem yet? I seem to have the same situation with my 730cs treadmill. It is inclined and will not move up or down...thanks.
SOURCE: lubricating a treadmill
The only lube required is between the walking belt and the deck. You can get the lube from iconfitness.com. Lift the walking belt and squirt some on the deck from each side, underneath the belt in the area where you usually walk. Walk on it for a few minutes to spread the lube around.
SOURCE: Freemotion treadmill incline not going all the way
The problem is either in the lower control board or the lift motor. I would start by replacing the lift motor. Then if that does not fix it, replace the lower control board.
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