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JOHN PIERRO

ProForm 735 CS treadmill stops working

After about half a lap my treadmill stops running. There is still power to the console and the timer keeps going, it's just that the motor stops. If I pull out the key and wait about 30 seconds and plug it back in again I can get the treadmill to start working again, but it stops again shortly after that. If I don't stand on the treadmill it will run continuously without stopping.


I tried lubricating the belt, but that didn't help. However, even after lubricating the belt it was hard to pass the "push test" where I pushed off at the top of the belt and at full incline, but only rolled about half way back.


The treadmill is plugged directly into an outlet, no extension cords. I opened the hood and found the tech sheet and went through the calibration procedures, which seemed to be OK as far as I could tell.


Are there some tests I can do on the electronics to see if there's a bad component somewhere?

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Treadmills , Home Cardio
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7 Answers from these members:
Manage My Life
Yes. If at 3MPH, you were only getting 25VDC that means the motor is bad. It is a possibility that the controller has also failed but it's not likely. The bad thing is that there really isn't a way to know for sure on the controller until you put a new motor in. If you put a new motor in and the problem is still there then the controller is bad and you should not use the machine until the controller is replaced. If you use the machine while you wait on a controller you run the risk of damaging the new motor.

In all honestly, in many cases (most) when the motor fails, the controller is what caused it in the first place. Anytime I have a motor come up bad, I always replace the motor and the controller. When the motor checks out good but the symptoms show bad controller, I will just replace the controller. But if the symptoms are bad controller and the motor checks bad, I replace both. I'm not just trying to get you to buy more parts, I'm just letting you know what I do and what I've always done.
by Manage My Life
January 30th, 2012
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JOHN PIERRO
When I did this test I was only getting about 25 VDC. So you think this means I need to replace the motor?
by JOHN PIERRO
January 29th, 2012
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Manage My Life
The sensor just reads the speed, it doesn't shut the motor off. You can check the motor to see if it's failed or not. Unplug the treadmill and remove the motor hood. Then unplug the red and black wires that go to the motor (unplug them from the controller board). Connect a meter to the red and black leads, so the motor is connected to the meter. Set the meter to read DC volts. Plug in the treadmill and put the safety key in place. Now walk on the treadmill until you manually get the speed up to 3MPH. While at 3MPH, look at the meter and see what voltage is shows. The motor spinning at 3MPH should generate no less than 28VDC. If the voltage at 3MPH is less than 28VDC it means the motor has failed. If the voltage is 28 or more, the motor is fine and the controller is bad.

For what it's worth, it's pretty unusual for the motor to fail in this manner.
by Manage My Life
January 27th, 2012
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JOHN PIERRO
I checked the video and it seems the belt tension is OK. I bought another tube of lubricant and applied it. I also took the belt rollers out and put a little oil on the bearings and they seem to roll OK. When I try the push test now I can get to the end of the roller if I extend my arms completely when pushing off. However, after all that I still have the same problem. The only thing left I can think of is that the sensor that shuts the motor off is bad. Any other ideas?
by JOHN PIERRO
January 25th, 2012
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Manage My Life
What concerns me is that after you lubricated the belt it still did not pass the "shove test". Watch

THIS VIDEO

to make sure you have the belt tension adjusted correctly. If you do and it still fails the "shove test" then it's very likely due to a worn belt or walking board. If you lift the belt and reach under it and slide your fingers across the walking deck (in a side to side motion) it should be smooth. If you feel any ridges or unevenness then the walking deck is worn out.

It sounds like whatever is going on with the belt/walking deck is causing the motor controller to over-amp and it's shutting down.

Let me know what you find with this.

Thank you for using Manage My Life!
by Manage My Life
January 9th, 2012
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afritz afritz
Managemylife.com is a great place to find the answers to just about anything. I would suggest that you provide a little more information such as the make and complete model number of your product so your expert will be able to provide you the best possible answer. Just click on reply below where you can provide the additional information.
by afritz afritz
January 7th, 2012
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JOHN PIERRO
I forgot to mention that I adjusted the belt tension until it started slipping, then increased the tension just a bit.
by JOHN PIERRO
January 7th, 2012
Answered in 1 minutes
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