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KE2KB 01-15-2009 11:35 AM

Bearing grease
 
Hi;
I just took apart my Sears Vacuum power nozzle because it was smelling bad while running.
I traced the problem to one of the sleeve bearings. I have cleaned it up, and it may just need some grease, not replacement.

Can anyone tell me what type of grease I should use on this?
It's probably between 500 and 1,000 RPM.

Thanks

Chemist1961 01-15-2009 01:40 PM

NO to GREASE---

SEVERAL RULES, CLEAN OUT HAIR AND THREAD, REPLACE METAL WASHERS ON BOTH ENDS.

Spray shaft with WD40. grease will hold the dust, you don't want that. Hold the pulley and bushing and spin the brush. Flip your belt inside out to inspect for wear. If it has teeth roll it, inside out, look for cracks. If it is is smooth polish any burned rubber or rust off the drive shaft with fine sand paper and tuck your spare belt inside the head so you will find it when you go there next time.

Old Vac Tech :thumbsup:

KE2KB 01-15-2009 02:44 PM

Quote:

Originally Posted by Chemist1961 (Post 213200)
NO to GREASE---

SEVERAL RULES, CLEAN OUT HAIR AND THREAD, REPLACE METAL WASHERS ON BOTH ENDS.

Spray shaft with WD40. grease will hold the dust, you don't want that. Hold the pulley and bushing and spin the brush. Flip your belt inside out to inspect for wear. If it has teeth roll it, inside out, look for cracks. If it is is smooth polish any burned rubber or rust off the drive shaft with fine sand paper and tuck your spare belt inside the head so you will find it when you go there next time.

Old Vac Tech :thumbsup:

Thank you very much for your advice. There was a lot of hair, and dust caught in the roller at the bearings. I have cleaned it all out now.
I suppose I need to get good washers to replace the worn ones. Not the standard hardware I use on nuts & bolts, right?

Chemist1961 01-15-2009 03:53 PM

I meant replace as in don't throw them out.The worn washers are spacers. They should be fine. They often get thrown out wound inside in the hair and then the brush gets clogged with hair etc... What you smell burning is generally hair wound into nylon or wood.

If it's not back together already spin the motor shaft. It it squeals, use a small shot of wd40 out of the straw where the drive shaft meets the motor housing and at the other end of the motor where the center bushing meets the neck of the power head BUT NOT into the inside of the motor. Flip it over and lube your wheel axles the same way. Just a light squirt:thumbsup:

KE2KB 01-15-2009 09:09 PM

Chemist1961;
Thanks very much for your help.
I don't have it all together yet. I was waiting to see what grease I would need, and am happy that you told me not to grease.
I saved the washers too. Was pretty dirty in there.
The belt looks great. Like new.
The motor doesn't make noise. I had it out, and powered it up briefly several times (under very controlled situation) and it sounded fine.
When I first smelled it, I thought it was the motor brushes, but they looked fine, so was perplexed. It wasn't until I started taking the rest of the thing apart that I smelled the bearing.

Thanks again.

FW

Nestor_Kelebay 01-15-2009 11:16 PM

I know you're not planning to grease now, but I thought I'd add this post in case people were wondering "what kind of grease should I use".

Everyone is familiar with synthetic motor oils. However, that same technology is used to make synthetic greases nowadays. "SuperLube" by Permatex is a synthetic grease with teflon in it. Basically, it's a grease for "all seasons and all reasons", but I'd be reluctant to use it on anything that moves quickly in cold weather.

But, it's a great all around grease for use on most stuff in non-freezing temperatures.

Chemist1961 01-16-2009 06:41 AM

In a pinch I have used sewing machine oil as well, just a drop. Most power heads run with either a sealed bearing or an oil soaked bushing.
The biggest problem in maintaining them is periodic inspection. I have seen many with crud caked with dirt and hair where a quick rinse with WD40 has helped to roll the hair and thread back out of the drive pulley by rolling it with your fingers which is why I prefer a spray that will clean and lube. I have done this to clean out ball bearings in some heads as well but then repacked them with grease which is where the correct grease is a must.

I suspect a thin film of Nestor's lube would be fine but you need to clean the assembly properly before lubing which is where a spray can help. Polishing the brush shaft/ axle with a light touch of extra fine wet dry sand paper can help too. That said I will try to track some down of the Superlube for myself.


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