Pulling a dead bearing off a Peruzzo flail mower roller

[Fallon]

Heard strange sounds coming from the Peruzzo Brush Bull 2200 flail yesterday & found a lot of slop in the roller. Probably 500 hours on the mower & I regularly grease it every 10 odd hours, so I'm not sure why it failed. Remove 2 grease zerks & 4 bolts I the whole assembly comes off almost trivially. Of course to pay for that part being trivial the bearings look to be a pain. One end cap immediately fell off spilling out bearing remains all over. The other side has massive slop in it, but doesn't want to come off.

Have an E-mail into Iowa Farm Equipment to order new bearings, but am sure they are closed on Labor day.

How would you go about removing the inner & outer bearing races? I can't get a gear puller on either. One is a blind hole & the other has the bearing right up against a shoulder. Try & run a weld bead to shrink the outer bearing? Shrinking the inner bearing would just make it tighter. Grinding will take forever & be awkward with a decent chance of me gouging the shaft.

The inner race looks to be a double taper (minus the massive grove worn on one side during the failure). That would make me think I'd have to drive the whole bearing into the roller then hammer the shaft on the cap in. And you never want to hammer across the rollers or ball other than applying force directly on the race. I'll probably get a slide hammer to remove the cap that is still attached, been needing one anyways & that bearing is already toast. More worried about putting it back together properly without damaging the bearing.

 

[Richard]

(never having seen in person a flail roller)

Would dry ice work on the inside to shrink it?
Would heat work on the outside to enlarge it?

Years ago, I had a dirtbike. (1983 Maico 490) Rebuilt the engine. How am I going to get the main bearing & stuff out? Turns out heating the engine case with a propane torch was sufficient. Got it pretty warmed up, the old bearing came out, literally dropped the new one back in the hole.

Engine case cooled down, bearings were locked in place.

 

[Alan W.]

I would just split the inner race with a cut off wheel in the Dremel.
Weld inside the outer race and it will come out easy.

 

[mrmikey]

I would just split the inner race with a cut off wheel in the Dremel.
Weld inside the outer race and it will come out easy.

Yup. You wouldn't have to cut clear thru the inner, cut into it as far as you're comfortable, cover it with a rag and give it a whack with a hammer. If you touch the inner shaft no big deal, within reason of course .

 

[Fallon]

Yup. You wouldn't have to cut clear thru the inner, cut into it as far as you're comfortable, cover it with a rag and give it a whack with a hammer. If you touch the inner shaft no big deal, within reason of course .

Ya, that was my thoughts. Was hoping there was an easier and/or safter way I hadn't thought about.

I'm familiar with the trick of heating a bearing & cooling the shaft to grow the bearing & shrink the shaft. Likely to use that trick or it's inverse (heat the roller cool the outer bearing race) for install. But with the 2 locked together I' not likely to be able to heat up the bearing enough to expand it off the shaft without also expanding the shaft.

 

[quicksandfarmer]

This sounds exactly like what I went through with my drum mower. I was able to cut enough with a Dremel tool to break the race into pieces.

 

[BillC72]

Yes. Cut the inner and whack to crack. Weld a bead on the outer....falls out. Fine Emory on the journal. Probably will need to warm the new bearing to install it on the shaft. In my life I've had to replace very large and expensive bearings on huge machines. Heat is your friend. Some things are built so precise that you swear the new bearings are way too small. But when heated to the proper temperature, will go on from across the room.

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