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Electric Motor Shaft

U

UP Oliver

Member
Hello.

Not a tractor question, but I have looked around online long enough and can't find what I need and I have never not gotten the information I need from people who use this site.

I have an add on wood furnace, and my blower motor has problems. Over the course of time, I have determined the shaft of the motor slides out of the motor enough so that the spinning blower hits the housing of the blower and it stops. I took the whole thing apart, and I see a bushing there that the shaft goes through. This is a Monarch add on, I am guessing it was built in the 70's? I have to add oil in the ports on it once in awhile, and there is a material there that holds the oil I guess and releases it over time to the shaft/bushing area. The shaft slides probably close to a half inch when I pull on it, I did learn that it should have no more than an eighth inch of play. I just cannot figure out how that shaft is supposed to stay in place. A new motor is $123, this one will do the job if I can keep the shaft in one place. Any help is appreciated.

Thanks.
 
If you had the motor apart, why not try to shim the shaft to the position you need? That's an awful lot of end play for an electric motor, I'm thinking that it may have had some fiber thrust washers in there that disintegrated.
 
Remove the blower from shaft. When motor is spinning the rotor will magnetically center itself in the field windings. Use a sharpie and mark on the shaft where it sticks out the motor. Then take motor apart and install shims to keep it close to magnetic center. Make sure there is a little play in shaft. Another thing you could do is move the fan so it won't rub.
 
I second what Fritz said. If you have a lathe or know someone with one you can make a bushing out of bronze or some sort of fiber if you can find some or have something. Even if it isn't made to take much thrust most motors have some sort of thrust/end play washer or bushing. You need to figure out where the armature needs to be and where why it isn't there and what needs to be in place to keep it in position. I would guess as long as it had .010 or .015" end play it would be ok.
 
Thanks for the responses. I figured shimming was the best option, but I was also wondering if there is some special washer for the shaft that barely fits over it so that it is snug on the shaft, keeping the inside in a certain place. That is all I can find on the shaft now, one little washer in there. I just had no idea on that.

I have moved the blower so it does not hit the housing, but the shaft just slides over time with the blower attached and goes back to rubbing on the housing. Anyway, I will hopefully get this done tomorrow.

Thanks again for the help.
 
I had a similar issue and moving the fan on the shaft stopped the problem. Also, clean the fan- if enough dust accumulated, it may be throwing the fan balance off and causing it to pull one way or the other.
 
Got to a good hardware store, or electric motor shop if one is nearby, and get some fiber washers of the correct shaft size and center the rotor as best you can in the motor fields. You mentioned I/8" free play; I would go just a little less than that. Also check the condition of the starting switch while you have the motor apart; at least clean the contact points before you put it back together.

P.S. I used to repair electric motors during the winter months when I was on the farm.
 
Back in the day I worked on AC and would to rebuild fan motors. Now you can't even get the motors apart.

I would push on shaft when motor was running to see which way it would move.
 

My local independently owned hardware store has a pretty good selection of bronze bushings and fiber washers. Maybe yours does too.
 
The washers that contact the friction bearing assemblies are usually made of fiber. They adsorb the oil and block it from splashing over rotor and stator. However, I've never seen a 1/2 inch washer stack up.. Look at the shaft carefully and see if maybe there is a groove or two for snap rings or such. That'll back up a thin washer in the correct position on the shaft and prevent sliding.
 
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