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Old 11-18-2012, 08:22 PM
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Default stow mixer rebuild project

Hey all
I was given a small stow plaster mixer, and i need to replace the bearings and seals, but am having a bear of a time getting the large gear off the paddle shaft. dont see using a puller (like i had one big enough) any ideas
Thanks, Bill
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Old 11-18-2012, 09:11 PM
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I would use penetrating oil and heat if need be and make a puller by capping a piece of pipe and welding on a nut and then tack the pipe to the gear. If the gear is cast you might want to use nickle rod.
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Old 11-18-2012, 09:17 PM
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Find a three-point puller like they use for pulling hubs off tapered axle shafts; drill 3 holes in the flange of the gear and bolt the puller on. Looks like you'll still need heat and penetrating fluid of some sort but you'll have something to pull it with...
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Old 11-18-2012, 09:19 PM
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If it wont weld, I would drill 3 holes close to the hub and use a harmonic balancer puller. After a good dose of Fluid Film.
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Old 11-18-2012, 09:24 PM
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That looks like a tough one. what holds the gear, a set-screw ?
What holds the shaft in place ?


May have to rent a large bearing separator with a puller.

No matter what you need to clean up the shaft before you do anything.
Do not pull over rust.
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Old 11-18-2012, 09:47 PM
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Default stow mixer rebuild

thanks for your replies, I cannot find anything holding it on, there is a key
in the spline, but no setscrew
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Old 11-18-2012, 10:01 PM
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Looks like fun, what was on the outboard side of the shaft the gear is on? Are you sure there are not any setscrews above the keys? Gunk hides a lot of them from time to time.

Barring anything like that I would drill 2 holes through the gear and put bolts or all thread rod and a piece of angle or channel across the end of the shaft and apply pressure. Probably need to heat and cool a time or three.

Scott
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Old 11-22-2012, 05:12 AM
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Yep I'd drill two holes thru the sprocket and use a strongback with backing plates on the back side of the sprocket, and a 25ton ram. After cleaning up the end of the shaft and ensuring there's no set screws, load the ram up and start to heat. Be sure when you heat not to concentrate all the heat at the center as it will need a place to expand We do this all the time at work, However usually MUCH larger hubs and shafts.

Good Luck!!
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Old 11-22-2012, 06:37 AM
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Before you do anything, clean the shaft and hub clean clean clean shiny clean.

With everything clean, usually heating the hub of the sprocket/gear will at least make a pathway for lubes like penetrating oils etc etc.

I'd agree with using a harmonic bal type puller with the making of three holes fairly close to the hub but outside of it's O.D. at least an inch.

Finesse and patience is/are the key to saving what you have in the way of shaft and gear/sprocket.

Using the puller described before and above will save you from beating the sprocket/gear to death.
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Old 11-23-2012, 03:30 PM
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Second the cleaning and the strongback ideas!

I'd chemically derust, clean (strip of emery cloth on the shaft) then heat the gear hub gently so as to expand it in relation to the shaft, apply penetrant, and repeat several times.
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