IH 2424 front pump driveshaft clearance issue

Holford2424

New User
I have a IH 2424 diesel with a front pump for loader driven by a shaft welded to a flange that is bolted to front of crankshaft. This is a setup made by a farm mechanic who has a small machine shop and does welding. Thing would work ok if only clearance to a casting was greater, and shaft, flanges and sprocket were lined up 100%. Loader worked ok when bought it from him until I put heavy load of dirt in bucket a few times and weld on crank flange broke. I cut fan shroud and pulled radiator, and removed front grill. Photos attached show casting etc. YT's Bob in the Repair/restore forum sent me link to Case IH parts catalog which showed somewhat similar setup originally; original parts not available. Am now planning to have 3/4"shaft turned down 1/16" and grind 1/4 inch off that casting below shaft, then have another machinist weld flange on straight, and continue to use sprocket and chain connections at pump. Can anyone comment on pbm?
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A love joy coupling at the crank. Would allow you more flexibility from the casting, also would reduce the strain on the crank so as not to possibly break it also. It would not allow you to run it out of alignment just some flex to it. you could also ues one at the pump for easier installation and removal.
 
As said a love joy coupling or other such set up. Even a splined type coupling will work better then a hard welded set up will because the haft has to flex some. I have a couple loaders on Ford tractors that have a bolt on hub that bolts to the crank shaft pulley and where it bolts on it has rubber bushings so it can flex a bit and then a spline type shaft that goes to the pump which also had a flex type coupler at the pump
 
Thanks for your help. Right now is a roller chain and 2 sprocket connection to the front pump which I think adds some flexibility. I am trying to get a lovejoy or similar connector for the crank end.
 

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