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Old 01-28-2020, 07:50 PM   #1 (permalink)
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need some ideas

got a weld position at work that was overloaded and best i can tell sheared the key way. i am having a hard time coming up with a way to get the gear out, to inspect and repair. the machine is old, lots of stuff is welded together and i dont have time to disassemble the entire thing to address this issue. i have zero access to the back, what you see is what i can get to. maybe possibly could get a gear puller in there but doubt it. current idea is drill and tap either side of the gear face and build a gear puller of sorts. any ideas?
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Old 01-28-2020, 07:54 PM   #2 (permalink)
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Yea that would be my choice, but first I'd run it and see if the gear slipping on the shaft would walk itself off if ran in the proper direction.
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Old 01-28-2020, 08:04 PM   #3 (permalink)
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Slide hammer with pulling hook attachment (or just hook a bolt head between the teeth and welderfabricate it to the slide hammer).
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Old 01-28-2020, 09:24 PM   #4 (permalink)
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Is that bronze or brass? Anyways, like said above I'd definately drill and tap and use a puller
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Old 01-28-2020, 09:24 PM   #5 (permalink)
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Why can't you hit that shaft with a brass hammer to drive that fucker out? Didn't you remove a nut from that gear?

I am sort of laughing at this; GF has a big fucking gearbox laying on the bench of her late Dad's shop.
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Old 01-28-2020, 09:29 PM   #6 (permalink)
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Turn it on. It should work itself off.
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Old 01-28-2020, 09:51 PM   #7 (permalink)
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Drill and tap 2 holes and use a harmonic balancer puller.
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Old 01-28-2020, 10:12 PM   #8 (permalink)
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Depending on the worm envelope, that may have gone together with the bronze gear on first and the worm gear inserted second. Meaning you might have to pull the worm gear out from the side before the bronze gear comes out in the direction you're looking at it.

Depending on the bearings you might be able to flex it enough to force it out...also with some creative grinding, it looks like you could get a 2-jaw puller under that.
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Old 01-28-2020, 10:24 PM   #9 (permalink)
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Originally Posted by vetteboy79 View Post
Depending on the worm envelope, that may have gone together with the bronze gear on first and the worm gear inserted second. Meaning you might have to pull the worm gear out from the side before the bronze gear comes out in the direction you're looking at it.
This ^^

Is that a cover plate on the right end of the worm gear?
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Old 01-28-2020, 10:59 PM   #10 (permalink)
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You could weld two nuts to the gear face and mount a slotted hole plate or hub pulled plate on it then install a slide hammer on that.
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Old 01-28-2020, 11:02 PM   #11 (permalink)
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Put a nut inside a socket weld the socket to the gear and extract with a bolt.
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Old 01-29-2020, 03:58 AM   #12 (permalink)
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If you can't take it apart to fix it just weld the fucking thing to the shaft
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Old 01-29-2020, 05:37 AM   #13 (permalink)
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Quote:
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Put a nut inside a socket weld the socket to the gear and extract with a bolt.
Damn Macgyver, thats a good idea.
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Old 01-29-2020, 05:41 AM   #14 (permalink)
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Damn Macgyver, thats a good idea.
how did I never think of this?
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Old 01-29-2020, 05:44 AM   #15 (permalink)
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If you can't take it apart to fix it just weld the fucking thing to the shaft
Yep, then it is the next guys problem!
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Old 01-29-2020, 06:04 AM   #16 (permalink)
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If the gear will move past the worm gear, get a nut that is the same as the threads on the shaft thread it on all the way to the gear. Weld it to the gear if the direction of the worm gear spinning will let it unthread and take the gear with it. If it is a reversible positioner, even better.

Still not sure how the nut in the socket is any different than just a nut??
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Old 01-29-2020, 07:10 AM   #17 (permalink)
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I’d weld two long bolts at their heads to the gear face.
Slide on a puller and add washers and nuts.
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Old 01-29-2020, 07:34 AM   #18 (permalink)
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Quote:
Originally Posted by dethmachinefab View Post
Yea that would be my choice, but first I'd run it and see if the gear slipping on the shaft would walk itself off if ran in the proper direction.
that was step one, no dice.

Quote:
Originally Posted by vetteboy79 View Post
Depending on the worm envelope, that may have gone together with the bronze gear on first and the worm gear inserted second. Meaning you might have to pull the worm gear out from the side before the bronze gear comes out in the direction you're looking at it.

Depending on the bearings you might be able to flex it enough to force it out...also with some creative grinding, it looks like you could get a 2-jaw puller under that.
do tell more about the envelope, i forgot this is your field of expertise. that thought crossed my mind. the big box on the right houses the chain drive to run the worm gear via the jack shaft. tried taking it apart so i could get the worm gear box off but its permanently attached best i can tell. im just a controls guys who isnt an idiot who fixed something once and apparently that has made me the maintenance guy. i dont have the desire or time to dive into this, so if the gear wont come out quickly im going to let management know they need to call someone else.

thats a 4x4 for reference
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Old 01-29-2020, 07:42 AM   #19 (permalink)
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the bronze gear may have a concave face to allow for a tighter mesh with the worm. you might have to pull the worm first since the gear wont just slide out. or knock the output shaft out the back side worst case.


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Old 01-29-2020, 07:55 AM   #20 (permalink)
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Whatever you figure out, please post the solution. I would drill/tap and use some kind of puller. I've never worked on that kind of machinery, but have had to core bore a wall to remove a 4" shaft from an air handler
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Old 01-29-2020, 08:17 AM   #21 (permalink)
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weld the gear on to the shaft, put cover on and walk away.
hope it lasts till you retire or get another job
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Old 01-29-2020, 08:31 AM   #22 (permalink)
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Quote:
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weld the gear on to the shaft, put cover on and walk away.
hope it lasts till you retire or get another job
nope. half the crap i deal with in this place is because of that mentality or because it was repaired by someone with a third world attitude (use whatever is there to accomplish the task, even if you could purchase the proper part for a few dollars)
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Old 01-29-2020, 09:01 AM   #23 (permalink)
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If you are going to fix it right then cut or damage the part that you know you are going to replace. If you are going to repair whats there then heat up the gear to help you drag it off. Drilling and tapping the gear will make future rebuild easier so that id say is a no brainier.
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Old 01-29-2020, 09:34 AM   #24 (permalink)
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Slide hammer with pulling hook attachment (or just hook a bolt head between the teeth and welderfabricate it to the slide hammer).
Similar to waht I'd advise...or just weld to the face of the gear and use a slide hammer
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Old 01-29-2020, 10:57 AM   #25 (permalink)
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Short fix, hold jack screw, heat gear, see if you can rotate shaft inside gear, install new key. Like others have suggested, drill and tap, use flange puller. Is the area behind the gear hollow? If not. Could use jack screws. If gear is readily replaceable, zip wheel and chisel. If not, hole saw around shaft, remove gear, make sleeve...
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