40HP RPC bearing size

claya · Dec 29, 2021

Anyone know what bearing size the AD-40 RPC (American Rotary) uses?
I would like to have the bearings in hand before tearing down the motor.
AR only provides the part #, not the actual bearing #.

johansen · Dec 29, 2021

sometimes its on the motor nameplate.

claya · Dec 29, 2021

johansen said:
sometimes its on the motor nameplate.

Ya. Looked there also.
AR wants $400/pair. That seem right for that motor size?

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johnoder · Dec 29, 2021

Frame size? Maybe 324T? Out put shaft is 2.125 - which means the bearing bore is somewhat larger than 2.125.

Here is an example WITH bearing sizes - for 324T.

Not necessarily YOUR bearing sizes

https://www.alliedelec.com/m/d/513140f5e87e403b291b844c65b91c1f.pdf

have fun - you probably know you can look in the electrical section of Machinery's Handbook and find out what your frame size is by measuring the motor

rons · Dec 29, 2021

Tearing down the motor is no big deal. Done it many times, too many. You're going to have to do it anyway.

Procedure:
1. Unbolt the two end bell covers.
2. Use a little heat on the covers to make the bearing hole larger.
3. Remove covers one at a time.

You think that is the worst part right? Wrong.

You have to remove the original bearings off the rotor. I always have to devise a fixture for that and either use some heat or pressing a op.

rons · Dec 30, 2021

claya said:
Ya. Looked there also.
AR wants $400/pair. That seem right for that motor size?

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Go call Motion Industries to see what AR's profit margin is...

I would part the case and flush the original bearings with acetone or lacquer thinner. Then inject the grease. Can eliminate a costly guess so.

If they are rubber sealed I've heard that a rubber side can be popped off and then pushed back on after a cleaning. Have not done that myself.

I replace my motor bearings with totally sealed ones. Reason is less atmospheric/particle contamination.

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40HP RPC bearing size

claya

Cast Iron

johansen

Stainless

claya

Cast Iron

johnoder

Diamond

rons

Diamond

rons

Diamond

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