Re: (ET) Pulling the motor bearings

Any discussion of dismantling mower motors deserves a warning about pulling the blade hub. When you look at the hub, you see a seemingly shaft-size circle around the screw hole. It is not the shaft! The blade hub is made of two pieces - a sleeve that fits over the shaft and a flange staked to the sleeve. The sleeve is closed on the flange end, with a clearance hole to allow the screw to go through and engage the threads in the shaft.

You need to thread a screw part way into the shaft. The puller pushes against the screw head. This is another reason you should plan on using a split puller, since it's the only thing that will fit between the sleeve end and the motor housing. If you pull on the flange with a two- or three-legged puller you're begging to pull the flange off the sleeve, which destroys it.

Chris

On Sun, Jun 19, 2011 at 11:28 AM, Bill Alburty <willaim kc rr com> wrote:

On my recent bearing pull from an E-12 skinny motor, I used a 3-legged puller which worked great and never endangered my armature windings. O'Reilly rents pullers and the first 48 hours is free. I was fooled for a while when pulling the flange on this motor until I figured out that the flange is only a cap on the end of the shaft. I guess the split puller attachment would be a great help if you don't have the correct size puller.
Bill Alburty E-12 Kansas

Chris Tromley wrote:
Actually I did use a split puller. Maybe my armature windings were unusually close to the bearing. Apparently something cocked while pulling and the edge of the puller severed a wire. Probably easy to avoid if you check the back side of the puller as everything tightens up.

Chris

On Sun, Jun 19, 2011 at 8:03 AM, <steven1955 comcast net> wrote:

Bill and others,

When pulling bearings off a motor do yourself a favor. Use a split bearing puller. (Google split bearing puller ot split bearing attachment to see what they look like.) Standard wheel pullers are too big and can damage windings or commutators. (Evidently Chris ran into this issue.) You can get away with wheel pullers sometimes, but the split bearing pullers were designed specifically to remove ball bearings in tight quarters.

Steve Naugler

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