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Oiling electric motors ?

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Nathan(GA)

05-20-2001 20:15:16




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Is there any reason not to pull the aluminum plugs on an electric motor and oil the shaft bearings? I've noticed some with little hinged doors for oiling and these that have the plug.

Thanks




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BlueLite

05-26-2001 15:56:13




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 Re: Oiling electric motors ? in reply to Nathan(GA), 05-20-2001 20:15:16  
For the ones with the aluminum caps, I leave
the cap on and determine how the motor is going
to sit on the machine. I drill a small 1/8 hole
on the high end of the cap, just deep enough to
start coming thru the other side. A pin hole size
is fine. The idea is not to get any metal fragments
on the inside and still have a reservoir for the
oil. You don't want to get any aluminum fragments
in the ball bearings. I had a 1/2 hp band saw motor with bearings start to smoke on me after 20 years. When
I turned the shaft by hand, the bearings were
rusty. It works fine now. Very light grease applied with a needle
grease fitting is probably a better option.

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Nathan(GA)

05-24-2001 11:27:41




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 Re: Oiling electric motors ? in reply to Nathan(GA), 05-20-2001 20:15:16  
Thanks folks. It's still going, so maybe it bought me a little time.

ltf, it's just a little 1/2hp with the press in plug. I guess the little hinged doors got too expensive.



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ltf in nc

05-22-2001 13:28:13




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 Re: Oiling electric motors ? in reply to Nathan(GA), 05-20-2001 20:15:16  
The large motors with the "plug" get grease, not oil!



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Nathan(GA) - UH OH !

05-21-2001 19:26:04




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 Re: Oiling electric motors ? in reply to Nathan(GA), 05-20-2001 20:15:16  
I went ahead and oiled it before checking the answers. I may have oiled too much according to yall. I didn't count drops, but would guess 10-12. It's my condensor fan on the air conditioner. It was squealing a bit. So far no noise and been running practically all day. I may order one anyway to have on hand. It's too hot to be waiting on shipping.

Thanks for the answers.



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Tom

05-22-2001 17:19:30




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 Re: Re: Oiling electric motors ? in reply to Nathan(GA) - UH OH !, 05-21-2001 19:26:04  
If it was so dry that it was making noise, probably it was able to soak up the oil you put in OK.



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big fred

05-22-2001 10:31:14




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 Re: Re: Oiling electric motors ? in reply to Nathan(GA) - UH OH !, 05-21-2001 19:26:04  
Too much oil will tend to accumulate dust and grit, the effects are cumulative, so overlubricating it once shouldn't be too much of a problem



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Jake

06-02-2001 22:17:08




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 Re: Re: Re: Oiling electric motors ? in reply to big fred, 05-22-2001 10:31:14  
Enco machinery has replacement 1/4" drive in oliers w/spring loaded caps. I keep several around in case needed when doing a gen or motor rebuild. Cost is only $1.50



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IHank

05-20-2001 20:48:06




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 Re: Oiling electric motors ? in reply to Nathan(GA), 05-20-2001 20:15:16  
Nathan- I've had good luck over the years with oiling 'em. I've had bad luck when I didn't...

If there ain't an oil hole use a small size drill bit and make one, instead of messing with the pressed in covers. Under the cover will be either old hard grease, or a thick pad that was once soaked in some kinda oil.

Either way, a little hole that will fit the tip of a pump oil can is needed. Use plain #10 motor oil as your lube and give the lube cavities a "big drink". Figger on doing it as an annual service and the thing should run forever.

Good luck, IHank

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Old Sparky

05-21-2001 16:24:04




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 Re: Re: Oiling electric motors ? in reply to IHank, 05-20-2001 20:48:06  
Use only 2 or 3 drops per year per bearing. It is possible to kill electric motors with excess oiling.



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Tom

05-21-2001 18:25:08




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 Re: Re: Re: Oiling electric motors ? in reply to Old Sparky, 05-21-2001 16:24:04  
Yes, regular oil is more important than a huge volume of it, a few drops once a year.



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