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Question about Precor 9.31 Treadmill

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My 3 year old (home personal use) precor 9.31 treadmill has started makking a dull continuous clicking noise when the belt starts. The noise appears to be coming from the back end. The noise get reduced when the machine warms up. Any guesses? Could it be the ball bearings in the rear or something similar? Thanks.

Posted by w2farhan on


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Stephen Miller

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  • Precor Master
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4 Related Answers


  • 14 Answers

SOURCE: ???maximum user weight for Precor 9.45i

Normally most home treadmills are 250-300lb user capacity.
Call Precor with your model # and S/N and they can tell you exactly.

Posted on Apr 29, 2009



  • 6 Answers

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


Posted on May 26, 2009


  • 83 Answers

SOURCE: wax or silicone on my 10+ year old Precor M9.21

Use silicone to lube your treadmill.

Posted on Apr 30, 2010


  • 95 Answers

SOURCE: Where can I find a Precor 9.21 treadmill motor cover?

Do you know which version of the Precor 9.21 you have? There are a few different versions you can view here. Click on your version to view the parts list and look for "Cover, Motor" or "Motor Cover".

For instance, if you have the 9.21 (AYYZ), the proper motor cover is this part #5019749

However, this part #5005569 is listed as the proper motor cover for the 9.21 (F5), 9.21i (2X), 9.21s (F6), 9.21si (2Y), and a couple others. Make sure you have matched up your exact model number with the motor cover you need so do you not order the wrong part.

Posted on Jan 13, 2012

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Precor treadmill making squeaking noise when running fast

Two likely candidates: Belt or tread. Lubricating the tread would be the easiest starting point; but if you're running at 7 or more you've probably already thought of that.
If the cover isn't too difficult to remove, you can expose the drive belt and the squeaking volume change would be an indicator that the drive belt is the problem.

Precor 9,31 treadmill tripping internal breaker

You may want to check how many outlets or other items that you have on the breaker. When those treadmills go faster, they draw a lot of amperage. Not much that you can do except for unplugging what you aren't using on that circuit until you are done. If you run an extension cord to another circuit, that draws even more amperage or hire an electrician to install a larger breaker for you.

Cuts off and speed is variable and shows err 4

Precor Error E4, Incomplete Initialization Probable Cause Indicates that an incomplete upper PCA to lower PCA initialization occurred. When this error occurs, all lift motor and drive motor motion is ceased and the display will go blank except for the error displayed.
Corrective Action Run the initialization program. Caution: The treadmill's running belt will accelerate to the treadmill's maximum speed (12mph). DO NOT stand on the treadmill's running belt during the procedure.
  1. Set the on/off switch to the OFF position. Wait a minimum of 10 seconds to allow the internal power supply to discharge.
  2. Remove the safety key from the console and set the on/off switch to the ON position.
  3. Press INCLINE UP and SPEED DOWN keys together. While pressing these keys, replace the safety switch on the console. Continue holding the INCLINE UP and SPEED DOWN keys until the display goes blank. INIT will appear in the time window of the display. The EEPROM is now clear and reset. After a second, 1.25 will appear in the distance/calories window, 15.0 (the maximum incline) will appear in the incline window, and 12.0 (the maximum speed) will flash in the speed/pace window.
  4. Press QUICKSTART to begin the speed calibration process. Power bits will appear in the incline window, the target speed will appear in the time window and the actual speed will appear in the speed/pace window. At the beginning of the process, the target speed will be .5mph. The running belt will start. Once the actual speed reaches .5mph, the target speed will then change to 12mph and the running belt will accelerate until it reaches 12mph, then it will stop.
  5. When the running belt stops, the display will return to the user mode and the initialization process is complete.
Precor Error Code E4

We also have a precor c966 it stops sporadically. We have already had it serviced and put a new belt on it and the problem continues.

see the video and lube the deck belt+rollers bearing too.
Tight the drive belt motor.
test the motor see the diagram and go to my personal tips for motor helps.
God bless you2_27_2013_6_25_12_pm.gif

Hello, Our Precor 9.21si begins slipping after walking or running a few minutes. Seems to be worse the faster you go. After about 1 mile, the house fuse blows. What troubleshooting steps do you thi

This really sounds like the results of long term use without lubrication or wax between the belt and deck. Chances are you will need to replace the running belt and the deck or flip the deck if it has not already been done. The friction builds up between the deck and belt and caused the electronic components to overheat. The machine is shutting down as a precautionary measure. It will do this only so many times before the electronics are zapped. Start with the deck and belt. Hopefully the electronics are okay. With your model and serial number, you can visit our website and view the products we have available for your particular machine.
Precor Repair Parts for 9 21s 9 21si Treadmills Consumer SPORTSMITH net

Precor efx5.21si noise

Step 1:

1)First lube the deck belt+rollers bearing see the video and proceed

Step 2:

2) if the problem persist
Time to replace the old board deck belt

Step 3:

3) You must tesst the maim motor bearing+ drive belt
see my personal TIPS for motor helps, and replace if necessary or repair.
God bless you

Precor 933i belt error

Please read my personal TIPS for treadmills and test it.
However LUBE inmediately the deck belt, this happen because the lack of maintenance by 5 hours aprox, So the system protect itself for electronic system and shut down.
2) LUBE the rollers bearing too.
3) Test the main motor bearint, measure the input voltage motor, if there are the motor is faulty. Repair. see my personal TIPS
God bless you

My new balance 1500 treadmill works great but the last couple days its starting to make a clickinng noise around the belt. It sounds like its tranfering from the motor area. The belt has never been...

It sounds like you have a bearing failing, either in the front roller or the motor. If it is the front roller it will be a dull "Clicking" noise, if its the drive motor it will be a growl noise. The growl will be so loud at top speed you wont be able to even talk over the noise. Remove the motor hood and this will help you determine the culprit.

If you need further help, I’m available over the phone at


Vision Fitness Treadmill belt started making noise

That model is probably at least 10 years old. They are very well made but it is long overdue for a new belt. Belts need to be replaced every 7-9 years depending on a million different factors. Whatever the noise is it's almost certainly due to the belt being old. My guess is that it's a bearing noise in the motor or the rollers. Roller bearings are cheap and easy but motor bearings are much more expensive to fix. You should find a local service person to come figure out the noise and replace the belt at that time.
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