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Tool Talk Discussion Forum

Treadmill

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Crem

01-05-2006 09:05:17




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We have a treadmill that works fine but after running it for awhile it smells hot. It has been doing this for over a year. It has a Choke wired in series with the DC motor. The motor gets hot enough so that you can barely keep your hand on it and the Choke, which looks like a transformer with two wires, gets somewhat hotter. All of the bearings stay cool. I am assuming that somehow the load is too great and have tried spraying silicon under the belt to decrease the friction. With no one on the belt, it turns very freely. We have been limiting the run time to a little over an hour because of this. Does anyone know what the function of the Choke is in the motor circuit? I am going to try and mount a small cooling fan in there to see if that will help.

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Crem

01-06-2006 09:44:26




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 Re: Treadmill in reply to Crem, 01-05-2006 09:05:17  
Thanks everyone for the help. I did some of the checks mentioned. The fan is part of the pulley and a large flywheel on the motor and blows pretty good. The brushes are not arcing excesively. I loosened up the belt and checked the feel of the roller bearings and then retightened doing the slip test. Thanks for that information. I believe that I have it just a bit looser than it was. I also loosened up the short motor drive belt as that was fairly tight. I guess that I will give that a try as I don't know what else to look for. we are not overloading it with weight, which could be another thought. If anyone knows of a slippery substance to put under the belt, let me know.

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Mattlt

01-06-2006 05:35:06




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 Re: Treadmill in reply to Crem, 01-05-2006 09:05:17  
I hate to go down this road...

If it were in my house, the problem would solve itself - my wife would just quit using it. We've got more exercise equipment gathering dust in the corner of the basement...

Anyway, hope you get your problem figured out.



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Adam2

01-06-2006 03:36:26




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 Re: Treadmill in reply to Crem, 01-05-2006 09:05:17  
I have not heard the transformer like term Choke used for quite some time. Its traditional function is to take the DC output from a rectifier and capacitor circuit and further smooth any choppiness in the AC to DC output.
In the treadmill's case, it is most likely smoothing out the speed controller's choppy signal.
Try checking the overall tightness of the belt. Just because the belt is tracking properly, does not mean a wicked amount of excess tension has not been imposed on the drive system.
The tread needs to be tight enough to not slip when a user is on it and the test is to try to give the belt a "kick" forward and then to the side. If either effort stops or moves the belt, give the two tracking adjusters, accessed through the holes in the end caps, equal turns "tight".
I hope this helps.

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fepo

01-05-2006 13:54:36




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 Re: Treadmill in reply to Crem, 01-05-2006 09:05:17  
what condition is the contact between the belt and pad underneath where the step zone is ? is it worn too badly and causing increased friction ?



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Crem

01-05-2006 16:14:12




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 Re: Treadmill in reply to fepo, 01-05-2006 13:54:36  
I checked the step area underneath the belt and it looks nice and smooth. The belt also looks ok. I noticed that the silicon that I sprayed under there has accumulated just a little out side of the stepping area. I wonder if I should clean it up and find something else like wax to reduce the friction.



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Not much help, but

01-05-2006 22:53:28




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 Re: Treadmill in reply to Crem, 01-05-2006 16:14:12  
the wax will probably get hot and burn. It may not clean off. Is the belt too tight? Can it be turned manually? Are the bearings free? Is an extension cord used? Has the motor been cleaned of dust. Does the motor have a fan that's not turning because it's loose on the shaft?



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