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Help needed removing 70 year old sprocket

K

Kirk Grau

Member
OK, sprocket on my old New Idea Spreader finally gave up the ghost. Went and picked up a new one this morning, but going to need some idease to get the old one off. See photos, sprocket is secured to shaft with a large rivet. Cut the head off the rivet and tried to drive it out, but it is not moving at all. Will heat help at all? If so can I get it hot enough with propane, or do I need to borrow some heavy artillery.

Any other thoughts on getting this off. Need to be able to use the spreader soon, everything is getting pretty deep around here.

Thanks,

Kirk
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you might try heat. Maybe even drill it out. Start with a center punch and a small drill bit. Go to a larger bit untill you can remove the last little bit with a small nail set. Just an idea. Gene
 
drill out the rivet first start carefully with center punch as close to center as you can get start with 1/4 in twist drill (bit)get larger as necessary careful not to drill out shaft hole bigger
 
Use a grinder parallel to the shaft and split the sprocket. May have to grind on two sides to get it to split. Then take the rivet out.
 
personaly i would drill the rivet and then get all the heat i could on the sprocket before i even tried to move it.maybe lay a thick flat metal over the end and put a bearing puller on it tight before the heat to see if it would pop loose.my experience with anything ran around manure that long is they are weak in places you dont expect.
 
One idea, take an air cutter or grinder with a thin cut-off wheel, cut it into two sections and have it fall off the shaft.
LOU
 
Old gear is junk right? Why not use a die grinder and cut it into 2 half's then just use a hammer and chisel and knock it off. If no die grinder how about a sawzall with the metal blade cut down so you don't hit the bearing. Heat would work but I'm afraid it would stink like s@#t no pun intended.
 
I'd start by drilling the rivet like Wilson suggested, if it won't budge then use a grinder or saw to split it. What's the bearing like behind the sprocket? Might be a good time check it out and if you see anything a miss get 'er done while your in the neighborhood.
 
Just take a grinder and split the sprocket. It is worn out so of o use.

Remarkable you could find a new sproket. Good old NEW IDEA. gitrib G Trible former NEW IDEA block msn were a bunch of great inovative men, till LYCOMING then AGCO took over.
 
By the way that is not a rivet 83 years caught caught up to me cannot remember what they are called it is a pin that is split. gitrib
 
Well since it looks like cast it should be as simple as cutting a groove in it then that a chisel and widen the groove and slide it off if it does not just break in to. Or is that too or two??
 
Roll pins are made from hard spring steel and probably wont drill too well. I agree with cutting the sprocket to get it off.

KEH
 
Well you have a grinder as we can see in the pics grind a straight line from end to end right across the pin. Don't worry about getting all the way across just stop where you miss the other parts right behind it. Then take a 1 to 1 1/2 lb ball peen hammer and give some good strikes just over the ground out spot. Start at the outer edge and work back. When striking with the ball peen use your wrist action dont just swing over head. This will give it much a much harder hit. It should come right off in large pieces. Then use a good pin punch to remove the roll pin.clean the shaft lightly so that the new sprocket goes on with a little restance. If its too loose it wobble an break again.
Walt
Ps I have a New Idea spreader they are good old machines mine needs new tires right now. You can get lots of parts at (nnalert.com)
 
Thanks for the ideas. Got distracted on other things this afternoon. Probably go into town this evening and pick-up a cut off tool or grinder of some sort. I had cut the heads off the rivet with my sawzall. Would use it to try to slice the gear in half, but kind of concerned about cutting into something I want to keep doing it that way.

Gitrib, For what it is worth, the NI parts book calls this a drilled rivet and indicates a cotter pin in one end, but that was not on this one. Both ends were rounded over and it is as solid as can be. Nice old card also. Territory manager sounds important.

Thanks, will let you know how it goes tomorrow.

~Kirk
 
Your right Keh . Roll Pins are very hard & I don t think that you can drill them out . I would think that the bit would drift from center & maybe ruin the shaft by drilling crooked.


John
 
Roll pins CAN be driven out, you need to google roll pin punch, it is a punch, with a nipple-like dome, on the end. If you use a regular punch, it tends to spread the pin, rather than let it contract, as you drive it. That being said, I would either blow the center section of the roll pin out with a torch, or grinder, it's easier to push a roll pin. that's cut off, in the center, 1/2" IN, from BOTH sides, than to try to push a rusty sh!t encrusted roll pin all 3" of the way, OUT, from ONE side!
 
If you whack that bad boy with a chisel parallel to the shaft you just might split it, used to spilt timing chain gears off sbc cranks all the time that way
 
No need for drilling, grinding, sawing or chisels as was suggested below. That is cast gear so just hold an anvil underneath and a couple blows with bfh and that will break off there like glass.
 

Thanks for sharing the business card gitrib, that is neat. As to the problem at hand, drilling will not work BTDT replacing closing wheels on the planter this spring. A good punch and a big hammer is the method. I do think you would be time ahead to split the gear like the others suggest before removing the pin.
 
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