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Re: (ET) How do I change motor bearings?
- Subject: Re: (ET) How do I change motor bearings?
- From: "Steven Naugler" <snaugler earthlink net>
- Date: Mon, 7 Jun 1999 19:08:54 -0400
- References: <008401beb0d7$64907ac0$0a56a8c0 studious>
- Reply-to: "Steven Naugler" <snaugler earthlink net>
- Sender: owner-elec-trak cosmos5 phy tufts edu
Sorry folks.... The bolt to cut off should be a 1/4-28 fine thread by 1.5
to2 inches long, not a 1/4-20. Sorry for the typo.
> -----Original Message-----
> From: Steven Naugler <snaugler earthlink net>
> To: David Roden (Akron, Ohio) <roden ald net>;
> elec-trak cosmos5 phy tufts edu <elec-trak cosmos5 phy tufts edu>
> Date: Monday, June 07, 1999 1:24 AM
> Subject: Re: (ET) How do I change motor bearings?
> >Dave, I've done this to 6 motors, so hopefully I can give some pointers.
> >1. The job is much easier with a split bearing puller and either a
> >hydraulic press or an arbor press.
> >2. You'll also need a 1-1/2 to 2 inch long 1/4-20 bolt with the head
> >3. You must remove the blade holder first. If the blade holder doesn't
> >pull off easily, screw the cut off bolt into the blade end of the motor
> >shaft. Use a split bearing puller to support the motor by the blade
> >so that you can push the cut off 1/4-20 screw with the press. When the
> >blade holder comes loose, the motor will drop, so hold on to it as you
> >off the blade holder.
> >4. With the blade holder off you can take the motor apart. The
> >should stay on the armature.
> >5. Using the split bearing pullers and a press you can remove the
> >Keep track of any washers or spacers and note carefully their positions.
> >They must go back in the original positions.
> >6. When you press new bearings on, only press on the inner races. I
> >recommend replacing the original shielded bearings with sealed bearings.
> >7. When you reassemble the motors, you must restrain the brushes.
> >are holes in the brush end of the motor that paper clips or toothpicks
> >be inserted to keep the brushes out far enough to clear the bearing
> >motor reassembly.
> >8. If you have old motors where the blades don't have fiber clutch
> >but are pinned to the blade holders, you should purchase the new style
> >holder with fiber clutches.
> > That was a very abbreviated set of rebuild instructions that only
> >touched on bearing replacement. If you have other questions, just e
> >Steve Naugler
> >----- Original Message -----
> >From: David Roden (Akron, Ohio) <roden ald net>
> >To: <elec-trak cosmos5 phy tufts edu>
> >Sent: Sunday, June 06, 1999 11:00 PM
> >Subject: (ET) How do I change motor bearings?
> >> Stupid question ... no, make that ~ignorant~ question (as the song
> >> ignorance can be cured, but stupidity is forever).
> >> My mower motor bearings are ~rough~. After Matthew Magda's sad post
> >> about his broken motor magnet, I decided not to tempt fate any longer.
> >> Hmm, how do I change the bearings in my mower motors? Getting to the
> >> rear (top) bearing seems easy -- take off the end cap, remove the nuts
> >> and brush carrier, and there it is. (Does it just lift out? I
> >> haven't
> >> tried yet.)
> >> But the front (bottom) bearing is not so obvious. Do I have to pull
> >> blade mount off the shaft? What kind of puller do I need? How do I
> >> replace the blade mount when I'm finished? Once the blade mount is
> >> pulled, does the armature just pull out of the housing?
> >> I want to do this right, and not destroy an expensive motor in the
> >> process. Please help, and thanks for the coaching!