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Tricks to removing gib head tapered key

D

Don-Wi

Well-known Member
I found a bad bearing on the reel of our Hesston haybine tonight when I was going over it, and in order to get at it I need to remove the hub that the drive pulley bolts to. It's held in place by a tapered key that has a gib head on it.

I know how they are installed, but what's the trick to removing them? I was hoping to cut hay tomorrow night but now I'm not so sure it's gonna happen. Gotta change that bearing.

Donovan from Wisconsin
 
Don. Take a length of pipe (heavy wallschedule 80 if available) just big enough diameter to fit over the shaft...cut a notch that will accomodate the gib key...place over the end of shaft w/gib key in notch...strike end of pipe w/big hammer..repeat as necessary. As long as hub was installed w/ at least a quarter of an inch clearance between it and bearing collar, you should have no problem. Gib key sometimes rust in keyway. Good luck!!
 
Don. Take a length of pipe (heavy wallschedule 80 if available) just big enough diameter to fit over the shaft...cut a notch that will accomodate the gib key...place over the end of shaft w/gib key in notch...strike end of pipe w/big hammer..repeat as necessary. As long as hub was installed w/ at least a quarter of an inch clearance between it and bearing collar, you should have no problem. Gib key sometimes rust in keyway. Good luck!!
 
That's kinda what I was thinking. Might need to convince Dad to hold the pipe while I swing the BFH....

Donovan from Wisconsin
 
Find a deep wall socket that will fit over the head of the gib key. Next, get a length of threaded rod that will fit through the socket. Run a nut down the rod, some washers, slide the socket on, then weld the rod TO the head of the key. Pull the key... or mroe properly, tension it up as much as you dare, then give the hub a whack, tighten again, another whack, etc. It will come out. You might need to weld the rod on a couple times as it sometimes breaks off, but it will get the key out...

Rod
 
Take a small chisel that will fit between the gib and the pulley and tap it in to force the key out.
Walt
PS that is what the gib is for.
 
Don"t forget the heat and candle wax method. Apply candle wax as it cools. Catholics use a Blessed candle from the last Baptism- that is ok. The rest can use generic birthday candles! Agnostics- use PB Blaster!
 
I have that same problem on 5 different IHC hay rakes that need the bearing housing welded up in back of the gear but that gear cannot be slid in. The heads of several of the keys are broken off.
 
No easy or good way to do it. Ended up taking my NH 479 Haybine down to a friend of mine who works in a machine shop after fighting the key for a week.

He ended up building a special puller for it, the sprocket would NOT go in even a thousandth or so to get some play in the key. No amount of heat or quick freeze would help it. DOUG
 
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