Hoover Convertible Model 707, newest restoration!

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chris i did switch the speed switch wire connections to the motor when i took it to a friends house to play with tools on it. i noticed the speed went low when the tool converter shoved in. was a simple fix, but glad i caught it, or it woulda burned up the motor after prolonged use like that under the load of the brushroll at high speed!
 
Hoover Model 707 Motor Hums, But Doesn't Turn

I just joined today, so please forgive me if I am not posting in the correct location.

I disassembled the vacuum and checked for obstructions - none were found. I reassembled it and it ran fine; but only for several minutes. After that, it was back to just humming, but the motor wasn't turning.

Any advice on what the problem might be, or how to go about diagnosing the problem, would be greatly appreciated.

My Mom has had this since new and would hate to have to get rid of it.

Thanks.
 
Hoover Model 707 Motor Hums, But Doesn't Turn

Have you checked the carbon brushes in the motor? If those are worn down or stuck, that may be the problem.  The machine may intermittently run, or not run at all.  Carbon brushes should be easily available from any vacuum store. I circled where they are located in the photo below; there's one on each side. The little bakelite cover comes off (a screw comes out), and you will get access to them. There is also a Hoover Service Manual available that walks one through the steps of disassembling a Convertible motor (among many other earlier models), if you have any hesitations.  Good luck!

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Hoover Model 707 Motor Hums, But Doesn't Turn

Thank you for your response and advice.

I do know how to access the carbon brushes in the motor. I actually removed them when I was looking for obstructions in the motor.

Since I wasn't aware that the brushes could be causing the problem, I didn't bother to inspect them thoroughly. They didn't seem to be worn down appreciably. Of course, I have no idea how long they are supposed to be when new.

I will perform a more thorough inspection. Is there a way to tell if they are worn simply by looking at them? Is there a way to test them (e.g., with a continuity meter)?

Also, thank you for the link to the Hoover Repair manual.
 
John,

<p style="text-align: left;">Is that a vintage HOOVER calender I see in reply #26?</p>
<p style="text-align: left;"> </p>
<p style="text-align: left;">Below is an example of a very worn carbon brush, the black carbon has been worn all the way to the spring, the brush is supposed to be longer and healthier then below.</p>

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Hoover Upright Convertible fans

I notice in your first picture, where the parts on your 707 are all laid out, the fan is an 11-bladed one, like the ones I've seen on other vintage machines. The newest replacements for my wife's model U4127 only have six. It looks like a generic replacement type. Can you confirm that to this newbie?

I'm hoping to find a Model 63 someday, like my mom and grandmother both had.
 

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