Motor bearings

hobbydad · Post by **hobbydad** » Thu Dec 17, 2009 11:21 am

Does anyone have information or the procedure for checking the motor bearings? I have an older Mark 5 500 with an AO Smith 1 1/8HP motor (Model C48L2A16). I have never had a motor apart, so I'm looking for help removing the sheaves and what I need to take apart to check the bearings. Hopefully I can find part numbers on the bearings to find replacements if needed.

I have the headstock torn down and I'm working on replacing the quill and drive sleeve bearings.

Thanks!

Loren

mickyd · Post by **mickyd** » Thu Dec 17, 2009 2:52 pm

hobbydad wrote:Does anyone have information or the procedure for checking the motor bearings? I have an older Mark 5 500 with an AO Smith 1 1/8HP motor (Model C48L2A16). I have never had a motor apart, so I'm looking for help removing the sheaves and what I need to take apart to check the bearings. Hopefully I can find part numbers on the bearings to find replacements if needed.

I have the headstock torn down and I'm working on replacing the quill and drive sleeve bearings.

Thanks!

Loren

Good bearings will not free spin. There should be resistance from the grease inside. They should not make any sound or feel when you rotate them by hand.

nuhobby · Post by **nuhobby** » Thu Dec 17, 2009 8:31 pm

hobbydad wrote:Does anyone have information or the procedure for checking the motor bearings? I have an older Mark 5 500 with an AO Smith 1 1/8HP motor (Model C48L2A16). I have never had a motor apart, so I'm looking for help removing the sheaves and what I need to take apart to check the bearings. Hopefully I can find part numbers on the bearings to find replacements if needed.

I have the headstock torn down and I'm working on replacing the quill and drive sleeve bearings.

Thanks!

Loren

Here is a nice set of service references:
http://allinonewood.com/?page=shop/serviceadvisor&

I have seen more than one motor assembly from the early '80s with a warped fan-sheave. Once you get to that level (taking off the big spring, etc.) then you might as well get a new sheave-spacer just in case, and a new lock-screw for the fan sheave.
As a rule the motor bearing nearest the sheaves will wear out faster than the other bearing.

Good luck!

wa2crk · Post by **wa2crk** » Fri Dec 18, 2009 1:39 pm

Hi;
If I have to take a motor apart it will not go back together without new bearings. When in doubt throw them out. Too much trouble to take the motor apart a second time to replace a couple of low cost bearings.
Bill