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Old 04-05-2013, 01:52 PM   #1
marcone
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Default Electric motor bearing puller

Bought a second hand impact drill and one of the bearing is loose so it needs to go off. Problem is that there is no space to fit a normal bearing puller, the actual bearing sitting almost pressed against the ventilation sprocket.
Any recomendation for a small bearing puller fitting cramped spaces? Would like something available in the old world.
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Old 04-05-2013, 03:10 PM   #2
N.I.
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Default Re: Electric motor bearing puller

You can get mini bearing separators-



Or could you clamp the bearing outer race in a vice and try hammering the shaft (with a bit of wood inbetween)? Hopefully the bearing is not on too tight.
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Old 04-05-2013, 03:12 PM   #3
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Default Re: Electric motor bearing puller

clutch pilot bearing puller might work
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Old 04-05-2013, 03:32 PM   #4
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Default Re: Electric motor bearing puller

Sykes Pickavant also sell this type of thing-

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Old 04-05-2013, 04:12 PM   #5
marcone
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Default Re: Electric motor bearing puller

Quote:
Originally Posted by N.I. View Post
You can get mini bearing separators-



Or could you clamp the bearing outer race in a vice and try hammering the shaft (with a bit of wood inbetween)? Hopefully the bearing is not on too tight.
The bearing is a somewhat recessed in the ventilation sprocket, thsi will not work; I'll post a picture later on.
My best guess is that I'll be needing a normal puller but with very thins arms.
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Old 04-05-2013, 04:14 PM   #6
marcone
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Default Re: Electric motor bearing puller

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Originally Posted by WhyMe View Post
clutch pilot bearing puller might work
Hmm, that's an inside bearing puller, I need an outside one.
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Old 04-05-2013, 04:28 PM   #7
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Default Re: Electric motor bearing puller

This might help:

http://www.vv.is/media/PDF/SNAPON_Verkfaeri_6_2011.pdf
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Old 04-05-2013, 04:54 PM   #8
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Default Re: Electric motor bearing puller

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Originally Posted by marcone View Post
The bearing is a somewhat recessed in the ventilation sprocket, thsi will not work; I'll post a picture later on.
My best guess is that I'll be needing a normal puller but with very thins arms.
I think I know what you mean.

How about buying a cheapy chinese 3 leg puller and grind down the jaws until they fit.

Ebay is littered with them and them are pretty much disposable.

Otherwise you will have to measure the gap and trawl though catalogs until you find one that fits
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Old 04-06-2013, 01:45 AM   #9
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Default Re: Electric motor bearing puller

Here's the picture:


Chinese puller griding is an ideea but I don't know how strong those arms will be after I'm done with it. Could happen that they'll bend or break off.

Wonder what they use in the service department to get this bearing off. Maybe the ventilation sprocket is just trashed and then normal puller is used.
The Rotor is off a Metabo.

Last edited by marcone; 04-06-2013 at 01:48 AM.
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Old 04-06-2013, 02:02 AM   #10
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Default Re: Electric motor bearing puller

Weld a large diameter washer to the outer race and use a regular puller hooked on the washer to apply the pressure. This gives a gripping surface away from the fan so you can use a regular gear puller.

I built a puller like the one in N.I.'s post by grinding the ends of a couple of pieces of all thread built up with a little weld and ground the resulting "balls" flat so they would slip into the gap between the bearing balls and twist to engage the inner/outer races. You have to remove the seal and spacers for the balls to get this design to work. I used my creation to replace a ball bearing on a Case bulldozer transmission without disassembling it, which saved a LOT of time and quite a bit of money!

I have seen pullers that were like a cup split in two that slips over the outer race and applies the force with a puller screw. It would be way too much work to make one of these. Most I have seen like this are for pulling magneto bearings.
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Old 04-06-2013, 02:09 AM   #11
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Default Re: Electric motor bearing puller

Quote:
Originally Posted by Provincial View Post
Weld a large diameter washer to the outer race and use a regular puller hooked on the washer to apply the pressure. This gives a gripping surface away from the fan so you can use a regular gear puller.

I built a puller like the one in N.I.'s post by grinding the ends of a couple of pieces of all thread built up with a little weld and ground the resulting "balls" flat so they would slip into the gap between the bearing balls and twist to engage the inner/outer races. You have to remove the seal and spacers for the balls to get this design to work. I used my creation to replace a ball bearing on a Case bulldozer transmission without disassembling it, which saved a LOT of time and quite a bit of money!

I have seen pullers that were like a cup split in two that slips over the outer race and applies the force with a puller screw. It would be way too much work to make one of these. Most I have seen like this are for pulling magneto bearings.

Don't have a welder

What I found:
http://www.ebay.de/itm/Mini-Ausen-La...item35c174ccf1

Seems quite high priced for a no-name tool!

Also looked up the Gedore catalog (page 387) and they have some bearing pullers with slim jaws and screws:
Gedore 1.18/XS
Gedore 1.19/XS
GEdore 1.23/XS
Waiting for dealer pricing on these.
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Old 04-06-2013, 02:19 AM   #12
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Default Re: Electric motor bearing puller

1st I'd clean the end of the shaft to a shine so when the bearing does start to move it will side off that section nicely. Is there a way to get behind the vent sprocket and pull them both off together? You could break the outer race of the bearing right off then tackle the inner race by itself.
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Old 04-06-2013, 02:23 AM   #13
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Default Re: Electric motor bearing puller

Quote:
Originally Posted by marcone View Post
Don't have a welder
And no friends with a welder?
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Old 04-06-2013, 10:44 AM   #14
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Default Re: Electric motor bearing puller

get a small cooks propane torch and heat the bearing up it will just slide off. Do not heat the windings, but the fan rotor will act as a heat shield any way. once you have the bearing piping hot, squirt some cold water on the shaft to cool it slightly and then pull off bearing with a welding or oven glove or damp towel. it might even just fall off if you tip up the rotor. Just heat the bearing though not the surrounding area. We used to do this kind of thing all the time at sea when you couldn't just go and get specialist tools. fitting a new bearing is also best done with thermal difference to. if its an open bearing that you can grease heat the bearing if its a sealed bearing then freeze the shaft. remember if your pushing a bearing on to push on the inner ring not the outer ring.
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Old 04-06-2013, 11:19 AM   #15
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Default Re: Electric motor bearing puller

Yeah, heat will work, but I wouldn't squirt the shaft with water to cool it unless you want to bend the shaft. You have to heat the bearing faster than the shaft to cause the inner diameter of the bearing to expand greater than the (interference) fit, so you'll have to apply a lot of heat and fast.

Propane heat will be marginal at best.
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Old 04-06-2013, 12:28 PM   #16
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Default Re: Electric motor bearing puller

Quote:
Originally Posted by eddiemeddiem View Post
Yeah, heat will work, but I wouldn't squirt the shaft with water to cool it unless you want to bend the shaft.
It should not distort the shaft as the shaft should not be hot enough to change the molecular structure. A little dribble of water just stops the shaft from heating much at all. Also if the bearing is heated evenly all around the shaft. propane is more than hot enough. your not looking for a huge temperature difference. no need to heat to an orange glow or anything. This is a technique I have used many times on small pump and motor shafts over the years and was passed to me by the Old Boys I served my apprenticeship under. Never had an issue. In industry it is usually always advised to fit bearings by thermal means as knocking/forcing them on to shafts places strain on the race and can shorten bearing life. It is not usually a good idea to heat new sealed bearings as the lubricant will run out. in these cases it is better to freeze the shaft. That's why bearing manufacturers sell induction bearing heaters etc. A temperature difference of 20-50 deg centigrade is enough usually.
However if you get out the Oxy Acetylene torch and get things to volcanic temperatures then, yes, you may distort shafts etc.
As we say round these parts: Gaan Canny! (Go Easy!) Contrary to popular belief in engineering, a bigger hammer is rarely the answer.
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Old 04-06-2013, 12:39 PM   #17
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Default Re: Electric motor bearing puller

Quote:
Originally Posted by marcone View Post
Here's the picture:


Chinese puller griding is an ideea but I don't know how strong those arms will be after I'm done with it. Could happen that they'll bend or break off.

Wonder what they use in the service department to get this bearing off. Maybe the ventilation sprocket is just trashed and then normal puller is used.
The Rotor is off a Metabo.
Have you considered pressing the fan and the bearing off? If you have access between the fan and the armature, and it could be properly supported (the fan may distort or break if not properly supported) this would do it.
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Old 04-06-2013, 12:41 PM   #18
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Default Re: Electric motor bearing puller

Quote:
Originally Posted by eddiemeddiem View Post
Yeah, heat will work, but I wouldn't squirt the shaft with water to cool it unless you want to bend the shaft. You have to heat the bearing faster than the shaft to cause the inner diameter of the bearing to expand greater than the (interference) fit, so you'll have to apply a lot of heat and fast.

Propane heat will be marginal at best.
Don't heat it. It will damage the windings in the armature.
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Old 04-06-2013, 01:15 PM   #19
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Default Re: Electric motor bearing puller

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Originally Posted by Steinmetz View Post
Don't heat it. It will damage the windings in the armature.
Not if you don't heat the windings. Were talking gently warming the bearing by probably less than the working temperature of the machine itself. I'm in no way suggesting a full on assault with a Oxy Acetylene Cutting torch. From experience, cast alloy fans such as fitted here tend to snap when used to assist pullers in removing bearings.

Hey, if in doubt, pass it to the nearest service centre to your house listed on the Metabo website.
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Old 04-06-2013, 01:39 PM   #20
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Default Re: Electric motor bearing puller

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Originally Posted by cryan View Post
Hey, if in doubt, pass it to the nearest service centre to your house listed on the Metabo website.
I think this iwill be my next move as I've taken apart also the gear housing in order to clean the old grease - man did this tool had a hard life, grease was coal black - and I can't figure out input shaft preload and how the selection mechanism operates. Right now I've got a bag of stuff for the dealer to put togheter
No apparent wear though, Metabo steel is good!

Last edited by marcone; 04-06-2013 at 01:42 PM.
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