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Motor hums Shaft won't rotate on GE 3 star  Rate Topic 
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 Posted: Thu Dec 12th, 2019 06:00 pm
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Cam Kuruliak
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I am trying to get my motor going on my GE 3 Star Form R4 Type A0.  I fixed the old wiring and when I temporary hooked up the power cord the motor hums  but the shaft will not rotate. Here is what I did
1. Took the rotor out and cleaned it all  up  & got rid of the old grease dust from it
2. Cleaned the inside & outside of the Stator I did not remove it because I read a post in here which advised against doing that.
3 Check the bearings and they are ok

As you can see it was pretty dirty The rotor is discolored is  that a sigh of a heat scorch:?
I am beginning to think the stator is toast and might have to get it rewound
Any thoughts?

Cam







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 Posted: Thu Dec 12th, 2019 06:16 pm
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Jim Humphrey
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Cam, unless you've already done it, I'd disconnect the wires to the motor from the speed coil and check the ohms A-B, A-C, B-C, and while they're disconnected I'd also check the speed coil terminals ohms Lo to Med to High.  No use deciding on anything before the checks are done.  Do you have some "after the cleaning" pics.  That thing is nasty!Oh, forgot to mention, that rotor looks perfectly normal to me.


Jim

Last edited on Thu Dec 12th, 2019 06:17 pm by Jim Humphrey

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 Posted: Thu Dec 12th, 2019 07:34 pm
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Lane Shirey
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Jim Humphrey wrote: Cam, unless you've already done it, I'd disconnect the wires to the motor from the speed coil and check the ohms A-B, A-C, B-C, and while they're disconnected I'd also check the speed coil terminals ohms Lo to Med to High.  No use deciding on anything before the checks are done.  Do you have some "after the cleaning" pics.  That thing is nasty!Oh, forgot to mention, that rotor looks perfectly normal to me.


Jim
 
And to add to Jim, check each stator headwire to the laminate core. Make sure you grind or throughly
sand off to reveal a fresh clean spot. These measurements should be infinity / open / no continuity.  Don’t just use a continuity tester. Use an actual meter. 

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 Posted: Thu Dec 12th, 2019 09:11 pm
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Steve Stephens
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And, if not said already, be sure to mark each wire you disconnect as to where it is attached to each end and mark the terminals on the fan for where each wire goes.

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 Posted: Fri Dec 13th, 2019 12:12 pm
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David Hoatson
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Hold the fan upside down and see if it runs. GE bearings tend to wear at the bottom of the front bearing. Flipping the fan runs it on a fresh bearing surface. 
Also, with the fan unplugged, turn the blade while pushing it in towards the motor. See if the rotor jams or gets stiff. The rear shaft shins could be missing or crumbled. 

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 Posted: Fri Dec 13th, 2019 12:19 pm
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David Hoatson
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The headwire looks terrible, too. Best to replace it. A tricky job, splicing a new wire to the stator coil. 
To check the stator coil, disconnect at least 2/3 of the headwires from the speed coil/switch, and take resistance readings of the stator. If you get readings on all three combinations (1-2, 1-3, 2-3), the coil is almost certainly good.

And, make sure every electrical connection in the speed coil/switch is clean and shiny. 

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 Posted: Fri Dec 13th, 2019 12:54 pm
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Cam Kuruliak
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Thanks Jim Steve David & Lane for all your help I did not take after pics (stupid me) but I know  cleaned the stator really good  with a fine scotch brite pad & sucked all the dirt out with a vacuum as well The rotor was cleaned down to the bare metal and the lead wire ends were cleaned with a fine emery clothThis was driving me nuts so I hooked up the plug directly to the lead wires When I plugged it in like I said  before it
 "hums"so  what I did I turned the shaft by hand and 'VOILA" it  rotated!!!!! no problem at all
Guys is my wiring correct? If you check pic #1 and compare it to Tom Newcity's  diagram I got off a post it  which is the exact same fan I have , mine appears different I am thinking I should connect mine like his but that still does not solve the problem of the shaft rotating by it self 
Any thoughts

Cam

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 Posted: Fri Dec 13th, 2019 11:16 pm
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Lane Shirey
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To me it sounds like the start coil is bad or not connected.  What were your ohm readings? That’s a common symptom of a bad headwire or coil.  

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 Posted: Sun Dec 15th, 2019 08:54 pm
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Cam Kuruliak
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Lane
I finally got this going & working on all 3 speeds on its own I had a few wires crossed (along with my own) & that was the problem
believe it or not that whole cage was blade from 105 yrs of smoke dirt & grease on it I am not restoring it just leaving like I bought it I got the new strut coming from Chad so I put the old on for now

Cam

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 Posted: Sun Dec 15th, 2019 09:54 pm
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Lane Shirey
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Cam, I’m glad that you got it running!  

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