Replace motor cover
SOURCE: Precor M9.21 Treadmill - Stops under load
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
Ben
SOURCE: Where can I order a plastic cover for the motor?
The only place that would possibly have the motor shroud would be Precor and they may say obsolete no longer available. This particular model # is not familiar to me since the common numbers on the older treadmills are 905e, 9.1, 9.17. 9.2 etc I assuming this was not intended to be sold in the USA.. I Suggest going to Precor's website and get the appropriate phone # to call.
SOURCE: Just moved my precor c966i treadmill (we
it should be a cable that looks like an oversized telephone cable. I can't really tell by the description of the problem if you just can't remember where it plugs into or if you've lost it altogether. There will be a circuit board in the base of the treadmill that will have something that looks like a phone jack port on it. That's where it will plug into. There should only be one port on the lower board that will accept that style of plug.
Testimonial: "This is the exact answer to the problem--after much searching around, I finally found the little box it fit into. the treadmill is up and running. Thanks for your input."
SOURCE: Where can I buy a replacement walking belt for a
FitnessRepairParts.com has a walking belt for Precor 9.21 treadmill (it says it is used on four different versions of the 9.21... make sure your specific model number is listed)
SOURCE: I am looking for a
Here is a motor cover for several versions of the Precor 9.21. Not sure if that's what you're looking for or not but maybe that will be useful.. you can click on any of the equipment models listed there to browse a complete parts list.
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