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Proform si treadmill makes loud squealing sound when running. Can I lubricate something?

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Tradmill belt - the thing you walk on probably needs silicone lubricant underneath the belt.
probably get from a sports shop that is local to where you live.

I have to get some for my own treadmill
Just haven't got to my local sports shop

Posted on Nov 30, 2019


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Posted on Jan 02, 2017


Roberta Smith

  • 5158 Answers

SOURCE: I have a sears proform 585 treadmill.

if it is a plastic belt do not put any oil near it as that degrades it

Posted on Jan 23, 2009


  • 1 Answer

SOURCE: loud squealing sound

It is the pump going bad.  There is a tech sheet inside a ziploc bag beneath the control panel.  From the front of the machine, lean over it and look just behind the control panel and locate the two silver screws towards the outter sides.  Remove those two screws and lift the control panel off.  Next to where the water hoses are connected you'll see a ziploc bag with the tech sheet inside.  It has instructions on how to put the machine into diagnostics mode.  Do this if you want and it should tell you the pump is going bad.
Our GWL11 was making that same noise and I just let it go because the machine still worked and, quite frankly, I had no idea what the heck it could be.  Though I'm handy, I've never attempted to fix a washing machine.  Boy, I wish I would have researched the issue online sooner.
After spending more time online researching this issue than any person should, it turns out that squealing noise is the pump going bad.  A fairly inexpensive (about $75) and easy thing to replace.  Should only take 15 minutes or so to change out, even if you've never done it before, and that includes the time to disconnect the hoses and manually bail out the machine.  But if you let the problem go the pump will eventually short out and in turn take out the controller board with it, which is about $130+ just for the part, and you'll have to replace both.
We got about a month of use out of the machine with it squealing then one day it just up and quit.  It would not power on at all.  I did all the unplugging, waiting 30 seconds, plugging back in, etc... and nothing.  Sure enoung the pump shorted out and took the controller board with it.  I actually just received my new pump Saturday (5/16/09) and replaced it yesterday hoping that would solve the problem, but alas, it still won't turn on.  Now I have to buy a new controller board...sigh...
Change the pump now and save yourself some headache and money.  If you have a model GWL11 the pump part # is 420325P.  Should you need the controller board too, it is part # 420094USP.  Good luck!

Posted on May 18, 2009


  • 614 Answers

SOURCE: outdoor unit fan making noise when running sounds

Bearing in fan going out. Let it run till it quits or call service tech to change motor. Fix cost about 250 to 300 dollars. russ

Posted on Jul 22, 2009



  • 10515 Answers

SOURCE: Proform 765 treadmill slows down when step on. Do


More likely time to replace the belt. Let me provide you with all the information you need. This information is already there on many websites.

(Bogs Down or is Sluggish) This condition is when the treadmill operates normally without a person on the belt and then slows down when someone steps on the belt or when the treadmill operates normally for a given period of time with someone on the belt then abruptly begins to slow down.
There are four typical causes for this problem (listed in order of our experience:
1) The walking belt and/or deck are worn. (85% of the time)
2) The walking belt and/or motor belt are too tight- if you have adjusted either recently. (8% of the time)
3) The motor has lost torque and needs brushes or has demagnetized. (5% of the time)
4) The controller is dropping output. (2% of the time)
Walking Belt is Worn:
The only certain way to test for a worn walking belt is to take a DC amp draw (if you have a DC treadmill) or an AC draw (for AC). Trying to look at the belt or a feel test is highly unreliable. Better tests, if you lack a DC ammeter (they are expensive for a good one), are a coast test or an incline test. To test the deck, go back to the Troubleshooting section and download the belt and deck inspections instructions. The coast test is to get on the treadmill as the lowest incline setting and walk on the treadmill at 3 MPH. Pull the safety key and it should take you 2-3 full steps to stop (this is a general rule…some like a few Tunturi models stop on a dime even with a healthy belt but most this tests works well upon). Fewer steps indicate high friction.
The incline test is to put the treadmill at max incline and walk on it at 3 MPH. If the treadmill operates normally at max incline but bogs down at minimum incline, replace the walking belt. Gravity takes over for the drive system eliminating the friction problem. On some heavily worn walking belts, this test will not eliminate the problem.
Walking Belt/Motor Belt too Tight:
If you have adjusted the walking belt or motor belt recently, check for this problem. When the belts start slipping, some people just crank down the belts and on treadmills, tighter is not necessarily better. The
tighter the belts, the more the drive system has to work to keep everything moving. You should be able to lift the walking belt (with the treadmill unplugged) in the center of the treadmill about 3” without straining. Tighter belts should be loosen but make sure you don’t create a dangerous slipping situation by loosening.
The motor belt (with the treadmill unplugged) should be able to be turned by hand to almost a 90 degree angle from its normal operating position. Loosen the belt if too tight. Make sure to test for slipping and if it does with the proper tension, replace the motor belt.
Needs Brushes / Demagnetized Motor:
Typically when we find a motor that has lost torque; it needs a new set of motor brushes. Typically we can make brushes for almost any motor if we don’t already stock them. Motor demagnetization is not that common but it does happen and it is normally easy to diagnose. If you have confirmed the belt and/or deck is not worn and the belts aren’t too tight, you can test for a motor torque problem. DO NOT USE YOUR HAND OR ANY OTHER BODY PART TO IMPEDE THE MOTOR…YOU WILL LIKELY LOSE YOUR BODY PART IN THE PROCESS IF THE MOTOR IS GOOD. The step to test for the motor is to use a foreign object preferably on a long shaft. First determine the direction of the motor spin (most have directional movement printed on the motor tag), then apply pressure with an object with downward pressure on the flywheel in the direction the flywheel is turning (do not attempt to put force against the rotating direction of the flywheel as you can easily injure yourself). If you can slow the motor, typically you need brush replacement.
To test for demagnetization, the motor must be disassembled. Once you have the motor retaining bolts removed, remove the motor core by sliding it out of the end of the housing. If the magnets pull the core against the housing and it is difficult to remove, the magnets are good. If the magnets do not attract the core, the motor has to be replaced.
This is the most uncommon of the causes. Typically replacing a controller in this situation will not solve the underlying problem and then you will end up replacing a belt as well as a control. Normally if a control is dropping output, it will do it with a person on the belt or not. Tests of DC output dropping is normal in many controls since they have a current limiter which will automatically drop output to prevent burning up the board. This is best diagnosed by eliminating the other possible problems first. If you are left with the control as the cause, replace the control.

The site :-

Any further assistance, let me know.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Oct 10, 2009

Tim F

  • 103 Answers

SOURCE: Proform 400GI Treadmill making a very loud noise,

This definitely sounds like the drive motor. One way to check is to remove the drive belt and run the motor without the walk belt connected. Obviously if you still have the noise it will be a motor issue. If not then it will be one of the 2 rollers. Good Luck! Tim

Posted on Nov 13, 2009

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I have a ProForm 400 CT. It runs OK, but it just started making a rattling noise.It is intermitant.

Try to lubricate the running belt. Also check the Running belt adjustment.
If you wish to get some details; check the site linked here. Pull up older posts. Choose treadmill articles to know how to Lubricate and adjust the running belt. Almost all the treadmill uses the same procedure

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Proform 400GI Treadmill making a very loud noise, which is worse when using speeds between 2.7 and 3.1, noise is so loud can't hear tv when turned up to full volume. It makes the noise without anyone...

This definitely sounds like the drive motor. One way to check is to remove the drive belt and run the motor without the walk belt connected. Obviously if you still have the noise it will be a motor issue. If not then it will be one of the 2 rollers. Good Luck! Tim

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You have a friction problem between your belt and deck. A treadmill of this age either came with a waxed deck, or requires periodic silicone lubricant spray on the deck. You can check your owners manual to see which type of surface your machine has. Typical belt life on a consumer grade treadmill is about 2 to 3 years. If you purchase a new belt from the manufacturer it will come pre-lubricated.

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