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Thread: How to remove pulley
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28th Oct 2020, 11:18 PM #1Senior Member
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How to remove pulley
What do ya reckon is the easiest way to remove this pulley. It seems a bit stuck, and I don't want to break the motor casing.
2hp motor and the pulley is 4" long x 4" diameter and has 2 grub screws (removed already) and a keyway.
20201026_213957.jpg
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29th Oct 2020, 12:25 AM #2
Hi Phaser,
A pin down the bore and a plate under the back. A pair of "G" clamps and a Bar across the pin. Heat the alloy pulley if wont start to move.
Once you’ve got it moving then don't stop if its hot, if it cools it could grab !Best Regards:
Baron J.
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29th Oct 2020, 01:49 AM #3China
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If you don't have one borrow or rent a puller
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29th Oct 2020, 07:17 AM #4Senior Member
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Unfortunately not so easy with this one.
The hole in the pulley for the motor shaft does not go all the way through (it's a blind hole).
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29th Oct 2020, 07:37 AM #5Most Valued Member
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Make a couple of U shaped wedges, put them between the motor and pulley (maybe put something in to protect the motor casting too) then squeeze them together with a clamp. Judicious use of heat if it doesn’t want to split under tension.
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29th Oct 2020, 08:12 AM #6Most Valued Member
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29th Oct 2020, 08:33 AM #7Member: Blue and white apron brigade
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I agree with Jack, Pulleys are cheap and easily replaced or turned up.
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29th Oct 2020, 08:53 AM #8Most Valued Member
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29th Oct 2020, 09:06 AM #9Senior Member
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I did wonder about doing it that way.
also I don't really have a suitable puller. The ones I've got would prob break the pulley rim instead of move it, so I'd have to make up something to go behind it (was hoping to avoid that).
Never know when someone has a simpler idea to yours.
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29th Oct 2020, 09:34 AM #10Golden Member
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If you are not interested in saving the pulley you could try supporting the motor on a block of hardwood directly under the green painted boss and giving it a few hits longitudinally around the boss with a large cold chisel to expand the bore slightly, if hit in the right place and hard enough it might even crack open along the keyway.
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29th Oct 2020, 05:13 PM #11Member
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Drill the center and tap M8-M10 . put a screw in to push against the shaft. hopefully there will be enough thread length left.
Robert
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29th Oct 2020, 06:07 PM #12Member: Blue and white apron brigade
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Worth a go, but it assumes the shaft is not snug or close to the bottom of the pulley hole. If it’s snug even a bottoming Tap won’t clear out enough thread to allow the bolt to pass through to press onto the top of the shaft. If there’s a drilled and tapped hole in the end of the shaft the tap could also damage that thread.
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29th Oct 2020, 07:45 PM #13Senior Member
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If you can't tap to the bottom, drop a ball bearing in before the pusher bolt.
If there's not enough depth for a thread (need 3 or 4 threads I believe) you'll have a hole for a puller
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1st Nov 2020, 12:45 PM #14Senior Member
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Sorry, what i meant to say is simpler idea to mine (generalization).
I do like the idea of drilling and tapping to see if a bolt will push it off, so that's what I'm doing now.
If that doesn't work I can drill it out bigger to let my puller go through to the shaft.
The thing is, I don't mind cutting off the broken small pulley end but I don't want to destroy it completely because if for some reason I can't complete a new pulley then I can put it back on and keep using what I've got.
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1st Nov 2020, 02:52 PM #15Senior Member
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So I cut off the damaged end of the pulley and tapped it M12, then used a long coach bolt (needing a long thread) and it came off easily.
Trying to hold the pulley whilst tapping the thread was the hardest part.
Oh and by the way ..... does anyone know the correct belt contact face angle for B section pulleys ?
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