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HOw to Get New Life Out of Dry Bearings


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#1 Utah Smitty OFFLINE  

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Posted September 11, 2011 - 04:41 PM

I'm in the middle of refurbishing a MF-7. The idler and the pulley on the drive belt both still turned freely, but they sounded and felt like they needed to be replaced. Considering that they are both OEM parts, and probably original to the tractor, they gave good service.

I need to use the mower, and didn't want to leave it in pieces while I ordered new parts. I pondered how put some lube into them. They're the typical pressed steel halves that are spot-welded together with a ball bearing between them.

I've tried using the red "straw" on a can of white grease to lube them, but couldn't get much past the rubber seal on the bearing.

While rummaging through my tool box, I found just the ticket. Years ago I bought a needle greaser--basically a heavy hypodermic needle with a grease zerk swaged to it. It's used to put grease into a sealed ball joint that doesn't have a zerk. You push the needle through the protective boot a give her a few shots.

Anwyay, I found that I could push the needle under the edge of the rubber seal, and squeeze a little grease into it while rotating the center of the bearing... works great!!

FWIW,

Utah Smitty
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#2 ducky OFFLINE  

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Posted September 11, 2011 - 07:23 PM

Yes sir, I have a couple of them in my tool box. Great to get you thru till parts guy arrives.

#3 caseguy OFFLINE  

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Posted September 11, 2011 - 07:41 PM

I usually use a penetrating oil first to get the grease that's in there loosened up, then I shoot some regular grease in to supplement it!

#4 DH1 OFFLINE  

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Posted September 11, 2011 - 07:53 PM

Yes that works, done it a few times myself, if you can get the grease where it needs to be they run better.

#5 Utah Smitty OFFLINE  

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Posted September 11, 2011 - 09:44 PM

"Yes sir, I have a couple of them in my tool box. Great to get you thru till parts guy arrives. "

Yes that works, done it a few times myself, if you can get the grease where it needs to be they run better.


"I usually use a penetrating oil first to get the grease that's in there loosened up, then I shoot some regular grease in to supplement it! "

Those are great tips as well... look like great minds think alike... ;o|

U S

#6 olcowhand OFFLINE  

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Posted September 11, 2011 - 09:45 PM

On bearings with a rubber seal instead of a metal shielding, the rubber can be popped out. I pop both sides, then clean out with solvent or diesel fuel with a little 2 stroke oil added to keep the bearings lubed while spinning/brushing in the bath to remove all the old grease. Then I blow dry, pop one seal in, repack with grease, then install the last seal. One word of caution. You can pack wheel bearings & any slow moving bearing completely full of grease, but on bearings used in high speed applications, such as PTO clutch idlers, you don't want to pack more than 40 to 50% full of grease. Filling the bearing area too full on clutch idler bearings can cause enough drag from the large amount of grease to keep things turning at slow speeds.
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#7 KennyP ONLINE  

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Posted September 12, 2011 - 05:07 AM

I need to find one of those 'needle greasers'. Think NAPA would have one?

#8 mjodrey OFFLINE  

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Posted September 12, 2011 - 05:39 AM

Yep.I've done that a few times too,until I can get new ones.

#9 olcowhand OFFLINE  

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Posted September 12, 2011 - 08:40 AM

I need to find one of those 'needle greasers'. Think NAPA would have one?

I'd think so, but I get mine at TSC farm supply.

#10 JDBrian OFFLINE  

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Posted September 12, 2011 - 10:13 AM

I usually try to keep some of the common 6200 series bearings in stock. They are readily available and cheap. I've replaced a lot of 6203 and 6202's on electric motors at work over the years.

#11 olcowhand OFFLINE  

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Posted September 12, 2011 - 10:21 AM

I usually try to keep some of the common 6200 series bearings in stock. They are readily available and cheap. I've replaced a lot of 6203 and 6202's on electric motors at work over the years.


Same sizes on many well pumps too. I buy & keep those sizes myself off ebay in lots of 10.

#12 KennyP ONLINE  

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Posted September 13, 2011 - 06:25 AM

I'd think so, but I get mine at TSC farm supply.

Thanks, Daniel. TSC is a ways away, need to make a list for going there. Hope they open one closer soon.

#13 Utah Smitty OFFLINE  

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Posted September 13, 2011 - 01:23 PM

I need to find one of those 'needle greasers'. Think NAPA would have one?


Yeah, I'd think so. If not, go to a farm supply store and buy a large needle for vet use. (less than $2) Solder or braze a zerk on the end and you're good to go.

U S

#14 KennyP ONLINE  

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Posted September 14, 2011 - 07:11 AM

Thanks U S. I'll look into that.




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