Question about Precor 9.21 Treadmill
I've tightened the belt to where I can raise the belt center about 2-3 inches. The belt is centered fine on the rollers. The belt is worn in the center on the underside but the deck looks and feels smooth. The motor remains cool to the touch all the time no matter the speed or incline or load. But the belt temporarily slips once or twice on every rotation no matter the incline. I called Precor and the tech suggested that maybe the motor or other electrical components may be getting old. Tech suggest I do an amp draw test but I don't own an amp meter. Besides perhaps needing to buy a new belt, doe anyone know whether or not the deck needs to be lubricated and with what? I will turn the deck over when I change the belt. Any thoughts?
If the belt is worn on the underside you will definitely want to replace the belt. The link at the bottom will take you to a video on how to use a liquid lube on your treadmill. Lubricating the belt/deck every 30 days will prolong the life of the belt and the deck.
The friction caused by excessive wear on the belt and/or the deck can cause a high amp draw and make the drive motor work harder than it's designed to.
How to Lubricate Treadmill Using Liquid Lube Video
Posted on Oct 16, 2014
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Posted on Jan 02, 2017
This probably did not happened suddenly right? the problem is not the motor however you can easily check the blue capacitor for peace of mind. with the power disconnected, disconnect one side off the capacitor from the top. with a ohm meter put the 2 probes on the cap,you will ear a temporary beep sound from your meter, then reverse your probes on the capacitor and again a temporary sound that mean your capacitor is good and your motor will run OK.
Your problem is more then likely your run belt and bed assembly. When new, these are coated with a wax of some kind for slipping, has you use the machine wax wears off, and so is the belt. You can see a black rubber dust at the rear of the machine. And so resistance increase when pressure is applied on the running belt.
Just behind the on/off switch where the power cord goes in, there is a auto reset 15 amp breaker that trips when too must resistance against the motor increase the amperage over 15amps. At 7 min/m on your speed setting and if the belt is adjusted correctly with nobody on, the motor pull about 6amps, with someone like me 180lbs, the motor pulls an avg of 10amps with a new belt.
If you have a clamp amp meter you can test it yourself.
2 parts you will need to fix this; 50985-101 (bed assembly) and 36355-101 (run belt 17 X 110) This is real easy to install.
make sure these parts are for your machine model # as they did increased the width of their belt over the years
Since 1998 I had to replace these parts 2 times with an average of 3 people using the treadmill every day. This is a good machine and if everything else is good it's worth it. I paid $300 for these parts, i'm sure if you shoppe a little you can do better.
Have a good one
Posted on May 26, 2009
SOURCE: Have a precor 9.20.
First, inspect the walking deck for damage (scratches, gouges, worn surface) and check the belt for wear. Feel the outer edge of the underside of the belt, then the center. The center should be rough like the outer edge. If it is smooth or fuzzy, the belt is worn out. If deck and belt are OK go ahead and lube the deck. I think Procor uses a standard parafin wax you buy at the grocery store, but check your manual to be sure. Apply the lube to the walking deck and try the machine again.
Posted on Feb 26, 2011
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