Electric Motor Problem

You might need to clean out the slots on the commutator Also, make sure the brushes are the correct ones and have proper tension. Eric

Adding to Eric's commen\\ts, the overhaul should also have included truing and smoothing the commutator. My bet is on wrong brush type for the unit. Central vacs are robust machines that can draw considerable current and require a high conductivity brush and maximum commutator contact. The proper brush may even need considerable copper content like those in auto starter motors. A set of OEM brushes might help the problem. HTH

Joe

Sounds like the brush springs are weak.

They used to say to "undercut the mica". Does that still apply? Did the overhauler do that last April? The mica is the stuff between the copper segments. When the copper wears down, the mica has to be cut down, I guess.

It's a central vac, not a $69 special. No reason not to fix it.

messagenews:B_WdnVNYidbYaCfYnZ2dnUVZ snipped-for-privacy@giganews.com...

special. No reason not to fix it.

Well, maybe there is a reason to replace it. He already spent time and money having the motor rebuilt less than a year ago. I guess I'd first take it back to whoever rebuilt the motor and ask them what's wrong. If I didn't get a convincing explanation, or it was going to cost much more to fix again, I'd be looking at a new one. You can get one for $250+

It sounds to me like whoever did the overhaul used the wrong brushes. They're probably shedding carbon.

messagenews:B_WdnVNYidbYaCfYnZ2dnUVZ snipped-for-privacy@giganews.com...

special. No reason not to fix it.

"One?" If that means a new re-builder, I guess I'd agree.

You can

Thanks to all who responded to my original post. I've taken a good look at the commutator on the motor and it doesn't look in the best of shape. I think the heat and arcing has pitted it badly. Guess I will look at replacing the motor. Apparently a replacement Lamb motor runs $195 to $245 here in Canada. Thanks, Mike

Well I took the central vac into the dealer this morning so he could make sure I was getting the correct replacement motor. Of course he wanted to try it, to see what was wrong. After seeing it run for 15 secs he stopped it , went to the back of his shop and came back with a gray stick of some type of abrasive material. He started up the vacuum, held the stick in some needle nose pliers and ran it up and down the commutator a few times, removed the stick and let the vacuum run. The severe arcing had disappeared and he pronounced it good for another 5 years! He said this stick was the best thing for removing any carbon buildup between the commutator and also for removing any rough spots. It was about $10 CDN per stick. Sorry but I've forgotten the name ot it already ( CRS disease). Of course while there my wife spotted the new type of electrified hose with on/off switch on the handle and wanted one, ( doesn't like my duct tape repair on the old one ) so the guy was happy to not charge for the work and we came away with a little extra on our Visa bill! Mike

Well I took the central vac into the dealer this morning so he could make sure I was getting the correct replacement motor. Of course he wanted to try it, to see what was wrong. After seeing it run for 15 secs he stopped it , went to the back of his shop and came back with a gray stick of some type of abrasive material. He started up the vacuum, held the stick in some needle nose pliers and ran it up and down the commutator a few times, removed the stick and let the vacuum run. The severe arcing had disappeared and he pronounced it good for another 5 years! He said this stick was the best thing for removing any carbon buildup between the commutator and also for removing any rough spots. It was about $10 CDN per stick. Sorry but I've forgotten the name ot it already ( CRS disease). Of course while there my wife spotted the new type of electrified hose with on/off switch on the handle and wanted one, ( doesn't like my duct tape repair on the old one ) so the guy was happy to not charge for the work and we came away with a little extra on our Visa bill!

Mike