Re: (ET) How do I change motor bearings?

["Max Hall" <maxo iname com>]

GO STEVE! This electrak forum is the berries.

-Max Hall
-maxo iname com
-Plywood Guy, Scooters, and what-all: http://www.maxmatic.com


-----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 small
>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
>curtoff.
>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 
>holder
>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
press
>off the blade holder.
>4.  With the blade holder off you can take the motor apart.  The bearings
>should stay on the armature.
>5.  Using the split bearing pullers and a press you can remove the
bearings.
>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.  There
>are holes in the brush end of the motor that paper clips or toothpicks can
>be inserted to keep the brushes out far enough to clear the bearing during
>motor reassembly.
>8.  If you have old motors where the blades don't have fiber clutch 
>washers
>but are pinned to the blade holders, you should purchase the new style
blade
>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 mail
>away.
>
>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 says,
>> 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 the
>> 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!
>>
>>
>