Dayton repulsion start electric motor help please

[btrnuthatch]

I picked up this 3/4 HP Dayton repulsion start motor from a free pile. It runs but a little noisy -- wouldn't describe it as a hum. I don't know sugar from shinola about electric motors so excuse my ignorance. I managed to remove the keyed pulleys from the shaft and !thought! I could then remove the cover so I could inspect the bearings and assess the possibility of replacement. The cover is not keyed so it can't be pulled from the shaft. At least I could see that.

But now I'm stuck. After removing the 4 long bolts, I've loosened the cover from the body and it spins freely on the shaft. On the left side of the motor are the wiring connections. Do I need to pop off that cover to proceed?

Finally, let's say I either give up and run it as is or I figure this out and replace bearings, what are the possible applications for such a motor. Before I picked it up, I hadn't heard of a repulsion start motor. After some reading, it seems like it exists for a higher torque start situation.

Advice please. Snark OK. Calling me dumb not necessary; I already know that.

Thanks.



Now what? What do I need to do to inspect the internals?

 

[Maui]

Here’s a good place for getting started:

The Vintage Craftsman GP Motor Thread

I was requested to outline some of my comparison information about Vintage Craftsman General Purpose Motors by a fellow GJ member. Most of this information was available on the forum prior to the 2021 forum update but has been lost or difficult to locate ever since. I am not an electrician and...

www.garagejournal.com

 

[Bert_]

Pull the shaft and everything out. Then you can get the front cover off easier. Will have to deal with the brushes.

Do the bearings rumble when you spin it by hand? These old electric motors always have a whine when powered up, that would be normal.

 

[btrnuthatch]

Maui -- Thanks for that link. Besides having great info, now I *want* a long C Craftsman motor.

Bert -- I wouldn't call it a rumble. Shaft seems tight but . . . it just feels and sounds a tad rough-ish. Maybe my expectations are not calibrated right. FWIW, when running, it doesn't dance across the bench.

I'll try to "pull the shaft and everything out" tomorrow.

Thanks for responding.

 

[btrnuthatch]

I gave up. Can't get the covers off. I should not have chosen this motor as an initial learning example. I did notice that the other cover housing (the wire side) has a keyed cap. That seems to suggest a 'pressed on' situation that would require a puller. And the screw head in the upper left looks to be a factor. I chickened out on undoing it.

 

[Bert_]

How exactly have you been trying to get it off?

I take the bolts out that hold the end bells, then take a dull chisel and hammer them off. Often need to work back and forth to get it to come off evenly. Need to use some sense since they are cast.

You don't need to mess with that cap until the ends are completely off.

 

[Milton Shaw]

Those motors have brushes on the stator when it is not at full speed so they will be noisy. The brushes lift when the centrifugal mechanism reaches operating speed. . Bearings are probably pressed on and will need a puller to get them off and the motor apart. Motor should quiet down once it gets to speed. They will normally have the highest starting torque of just about any motor except 3 phase.

 

[btrnuthatch]

Bert — dull chisel is what I used but after loosening both ends I encountered resistance. As I lack knowledge, I refrained from further brute force and cried uncle. To go further would require more than the ‘tap tap tap’ I’ve used so far. As you noted, I’d hate to crack the cast cover with more force.

And what about that big slotted screw head In the upper left (of the images)?

Milton — thanks for that additional insight. Is my expectation for it to run with a hum incorrect, that it will never hum?

 

[whateg01]

On the Dynaline repulsion start motor I just picked up, you can slide the brushes to reverse direction. Can't tell from the pic if that's what the screw is or not.

 

[seber]

Repulsion induction motors are always noisy. just run it. The good news is they have enormous starting torque.

 

[btrnuthatch]

Okay, case closed.

Thanks all!