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Electric motor bushings (lubricant)

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Skinner

07-05-2001 04:16:39




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My shop fan which has a 3/4 hp motor which runs for about 10 minutes then starts slowing down. When you turn the fan off it comes to a stop pretty quick. I took the motor apart and checked the bushings and they look pretty good but dry. I cleaned it up, put 3 in 1 oil on the bushings and what was left of the wick around the bushing and she seems to work fine now. The wick is pretty mushy and falling apart.

My questions are, what is the best lubricant for these bushings. (I used grease last time and it lasted a week)

Are new bushings and wicks available for a small motor like this or do I need to buy a new motor?

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mac

07-05-2001 05:40:05




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 Re: Electric motor bushings (lubricant) in reply to Skinner, 07-05-2001 04:16:39  
skinner: I have had the best luck with a good 10wt motor oil even 20wt works well. The felt is important as it absorbs the oil and keeps the bearings lub'ed. I have found bushings at an electric motor shop/repair. If the bushing are grooved be sure residue is cleaned out of them. Grease is not really a good idea.



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Old Sparky

07-05-2001 17:50:52




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 Re: Re: Electric motor bushings (lubricant) in reply to mac, 07-05-2001 05:40:05  
The 10 or 20 weight oil should be fine. If bushings are replaced, there is a little secret to remember. For motors up to 1/2HP, leave .005-.007 end play in the motor shaft when the end caps are tightened. Larger motors need more clearance. As the motor warms up, the motor shaft gets longer. If too little end clearance when cold, it will lock up in 15 or so minutes of running. When it cools, it will be free again, then will lock up again when run. Do not expect running the motor to create the proper clearance.

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Noel

07-09-2001 14:48:10




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 Re: Re: Re: Electric motor bushings (lubricant) in reply to Old Sparky, 07-05-2001 17:50:52  
If shaft end play is so tight that the motor binds, the other problems exist as well. The shaft is sized to require the use of spring washers to avoid excessive shaft end-to-end movement until motor reaches it's normal operating temperature. So, check for 'coking' or deposits in bearing recesses where the oil cooked away and clean as required. Oil suggestions sound good, avoiing oils with detergents added. The motor nameplate should specify the lube, but it may be on a separate label.

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Noel

07-09-2001 14:48:02




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 Re: Re: Re: Electric motor bushings (lubricant) in reply to Old Sparky, 07-05-2001 17:50:52  
If shaft end play is so tight that the motor binds, the other problems exist as well. The shaft is sized to require the use of spring washers to avoid excessive shaft end-to-end movement until motor reaches it's normal operating temperature. So, check for 'coking' or deposits in bearing recesses where the oil cooked away and clean as required. Oil suggestions sound good, avoiing oils with detergents added. The motor nameplate should specify the lube, but it may be on a separate label.

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