Question about Precor 9.21 Treadmill

1 Answer

Belt feels like it slips when I'm walking

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?

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  • Precor Master
  • 918 Answers

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

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  • 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

Ben

Posted on May 26, 2009

  • 95 Answers

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)

Posted on Feb 21, 2011

2manyhobbies
  • 129 Answers

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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We just bought a gently used Lifestyler Expanse 1500 treadmill today; it turns on & runs nice & smoothly...until we walk on it. When we start walking on it, it wants to slow down & we feel like...


From the manual: Troubleshooting
Symptom: The walking belt slows when walked on
a. If an extension cord is needed, use only a 14-gauge general purpose cord of five feet or less in length.
b. If the walking belt is over-tightened, the treadmill performance may decrease and the walking belt may be permanently damaged. Remove the safety key and UNPLUG the power cord. Using the 3/16" allen wrench, turn both rear roller adjustment bolts counterclockwise. 1/4 of a turn. When the walking belt is properly tightened, you should be able to lift each side of the walking belt 3-4 inches off the walking platform. The center of the walking belt should just touch the walking platform. Be careful to keep the walking belt centered. Plug in the power cord, insert safety key and run the treadmill for a few minutes. Repeat until the walking belt is properly tightened.
c. If problem persists, contact customer service.

Sep 17, 2017 | RTO Exercise & Fitness

1 Answer

How do adjust tension on treadmill belt


If the walking belt slips when walked on. Using the allen wrench, turn both rear roller bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift each side of the walking belt 3 to 4 inches off the walking platform. Be careful to keep the walking belt centered. Carefully walk on the treadmill for a few minutes. Repeat until the walking belt is properly tightened.

May 27, 2010 | Exercise & Fitness

1 Answer

Losse belt, how to tighten?


If the walking belt slips when walked on, first remove the key and UNPLUG THE POWER CORD. Using the hex key, turn both rear roller bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift each edge of the walking belt 2 to 3 inches off the walking platform. Be careful to keep the walking belt centered. Then, plug in the power cord, insert the key, and carefully walk on the treadmill for a few minutes.

May 20, 2010 | Nordic Track Exercise & Fitness

1 Answer

Belt is slipping when i walk on it


If the walking belt slips when walked on, first remove the key and UNPLUG THE POWER CORD. Using the hex key, turn both rear roller bolts clockwise, 1/4 of a turn. When the walking belt is correctly tightened, you should be able to lift each edge of the walking belt 2 to 3 inches above the walking platform. Be careful to keep the walking belt centered. Then, plug in the power cord, insert the key, and carefully walk on the treadmill for a few minutes. Repeat until the walking belt is properly tightened.

May 17, 2010 | Icon Image 17.5 S Treadmill

1 Answer

C2200 belt is slipping how to straighten and tighen belt


Normal 0 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} First, ensure that it is the walking belt that is loose. There is a belt hidden under the hood that connects the front roller to the motor (motor/drive belt). Start the treadmill at 3 or so and carefully apply pressure to the walking belt until it slips/stops. Watch the front roller. If it continues to spin when the walking belt stops, it’s the walking belt. It the front roller stops with the walking belt, the motor belt is loose and needs adjusted or replaced.

To adjust the walking belt, locate 2 hex head bolts, one on either side of the deck on the very back of the machine. These bolts will be recessed inside the plastic covers. Your treadmill came with a tool for this, but if you can’t find it, a standard (not metric) allen wrench kit will work. It’s helpful to have a wrench in each bolt so that you can adjust them at the same time, but one will work.

The allen bolts thread directly through each side of the rear roller. As you tighten the bolts, it pulls the rear roller away from the front roller, tightening the walking belt. This also centers it; if you tighten one bolt, it pushes the belt towards the center of the walking deck away from the bolt you’re tightening. So if the belt is too far to the right, tighten the right bolt and it will move towards the center.

Place your wrenches in the roller bolts and turn the machine on to 3-4 miles an hour. Keep your fingers clear of the belt, it will eat them. This method is quick, because you can see the belt move as you tighten one side or the other. It takes a few seconds, but if you tighten the right bolt for instance, you will see the belt move to the left. If the belt is loose but centered, tighten each bolt ½ turn and then get on the machine and see if it slips. The user manual will tell you to pull it up a couple of inches to test the tightness, which is a relative method and doesn’t necessarily work. My wife can pull on the belt and get 2 inches, and I can probably get 3 or even 4 if I’m showing off. The best way to test it is to gradually tighten it until you can run on it without it slipping.

You should lube the belt a couple of times a year. You can get them from iconfitness.com

Good Luck!

Mar 11, 2010 | Nordic Track /proform Treadmill...

1 Answer

When running the belt is jerky and feels like it slips a bit Dan


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To adjust the walking belt, locate 2 hex head bolts, one on either side of the deck on the very back of the machine. These bolts will be recessed inside the plastic covers. Your treadmill came with a tool for this, but if you can’t find it, a standard (not metric) allen wrench kit will work. It’s helpful to have a wrench in each bolt so that you can adjust them at the same time, but one will work.

The allen bolts thread directly through each side of the rear roller. As you tighten the bolts, it pulls the rear roller away from the front roller, tightening the walking belt. This also centers it; if you tighten one bolt, it pushes the belt towards the center of the walking deck away from the bolt you’re tightening. So if the belt is too far to the right, tighten the right bolt and it will move towards the center.

Place your wrenches in the roller bolts and turn the machine on to 3-4 miles an hour. Keep your fingers clear of the belt, it will eat them. This method is quick, because you can see the belt move as you tighten one side or the other. It takes a few seconds, but if you tighten the right bolt for instance, you will see the belt move to the left. If the belt is loose but centered, tighten each bolt ½ turn and then get on the machine and see if it slips. The user manual will tell you to pull it up a couple of inches to test the tightness, which is a relative method and doesn’t necessarily work. My wife can pull on the belt and get 2 inches, and I can probably get 3 or even 4 if I’m showing off. The best way to test it is to gradually tighten it until you can run on it without it slipping.

You should lube the belt a couple of times a year. You can get them from iconfitness.com

Good Luck!

Mar 06, 2010 | HEALTHRIDER Pro H500i Exercise Workout...

1 Answer

I am having problem with the belt moving when i am trying to walk/run on treadmill


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To adjust the walking belt, locate 2 hex head bolts, one on either side of the deck on the very back of the machine. These bolts will be recessed inside the plastic covers. Your treadmill came with a tool for this, but if you can’t find it, a standard (not metric) allen wrench kit will work. It’s helpful to have a wrench in each bolt so that you can adjust them at the same time, but one will work.

The allen bolts thread directly through each side of the rear roller. As you tighten the bolts, it pulls the rear roller away from the front roller, tightening the walking belt. This also centers it; if you tighten one bolt, it pushes the belt towards the center of the walking deck away from the bolt you’re tightening. So if the belt is too far to the right, tighten the right bolt and it will move towards the center.

Place your wrenches in the roller bolts and turn the machine on to 3-4 miles an hour. Keep your fingers clear of the belt, it will eat them. This method is quick, because you can see the belt move as you tighten one side or the other. It takes a few seconds, but if you tighten the right bolt for instance, you will see the belt move to the left. If the belt is loose but centered, tighten each bolt ½ turn and then get on the machine and see if it slips. The user manual will tell you to pull it up a couple of inches to test the tightness, which is a relative method and doesn’t necessarily work. My wife can pull on the belt and get 2 inches, and I can probably get 3 or even 4 if I’m showing off. The best way to test it is to gradually tighten it until you can run on it without it slipping.

You should lube the belt a couple of times a year. You can get them from iconfitness.com

Good Luck!

Mar 04, 2010 | Proform 760 CrossTrainer Treadmill

1 Answer

My nordic track c2000 apears to start working but then the belt stops, if i step off belt it starts working again


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To adjust the walking belt, locate 2 hex head bolts, one on either side of the deck on the very back of the machine. These bolts will be recessed inside the plastic covers. Your treadmill came with a tool for this, but if you can’t find it, a standard (not metric) allen wrench kit will work. It’s helpful to have a wrench in each bolt so that you can adjust them at the same time, but one will work.

The allen bolts thread directly through each side of the rear roller. As you tighten the bolts, it pulls the rear roller away from the front roller, tightening the walking belt. This also centers it; if you tighten one bolt, it pushes the belt towards the center of the walking deck away from the bolt you’re tightening. So if the belt is too far to the right, tighten the right bolt and it will move towards the center.

Place your wrenches in the roller bolts and turn the machine on to 3-4 miles an hour. Keep your fingers clear of the belt, it will eat them. This method is quick, because you can see the belt move as you tighten one side or the other. It takes a few seconds, but if you tighten the right bolt for instance, you will see the belt move to the left. If the belt is loose but centered, tighten each bolt ½ turn and then get on the machine and see if it slips. The user manual will tell you to pull it up a couple of inches to test the tightness, which is a relative method and doesn’t necessarily work. My wife can pull on the belt and get 2 inches, and I can probably get 3 or even 4 if I’m showing off. The best way to test it is to gradually tighten it until you can run on it without it slipping.

You should lube the belt a couple of times a year. You can get them from iconfitness.com

Good Luck!

Mar 03, 2010 | NordicTrack Exercise & Fitness

1 Answer

Everything seems to work fine except a small slip in the track about every 30 seconds or so. Is there something that needs to be tightened?


The walking belt may be too loose. If you have made recent adjustments, lubricated, or had repairs, a belt can slip if not tightened. The belt can slip if you have too much friction or if the belt has been recently lubricated. If lube does not help your problem and you have exhausted all other possibilities, the walking belt is most likely worn out and must be replaced.
To adjust the belt: Less Belt Tension: turn both adjustment bolts on back of treadmill in a counter-clockwise direction. More Belt Tension: Turn both adjustment bolts equally in a clockwise direction. Center Adjustment (moves belt center to the left): Turn left-side adjustment bolt counter-clockwise. Center Adjustment (moves belt center to the right): Turn the left-side adjustment bolt clockwise.
An over tightened walking belt can raise the amp draw of your treadmill, contribute to seam separation on the walking belt, or both, so do not over tighten the walking belt.
You should be able to lift the belt in the center on the side by approximately 2” to 3”, if you cannot lift it by 2” to 3”, the belt is too tight.

Feb 20, 2010 | Nordic Track NordicTrack Treadmill, A2550

1 Answer

How do I adjust tension on walking belt


A good way to test your walk belt to see if it is slipping is to stand on side rails with treadmill running about 4mph and while holding onto handrails keep one foot on the side rail and put your one foot on the center of the belt in a slight stomping motion,if the belt is loose you will feel it slip. To adjust a loose belt tighten each screw at back of treadmill 1/2 tun each until the slippage goes away. Be sure not to over tighten belt as this will cause excessive wear.If the belt has shifted to one side and you need to center it, go to the side it has shifted to and turn the screw clockwise 1/4 turn at a time until it centers.

Jul 14, 2009 | Exercise & Fitness

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