200 axle broke...why

Depends on the size of the duals. I've always been told that the outer tires should be 1" smaller in size than the inners. But I'm no expert.
Ryan in northern mich
 
I do run slightly smaller duals on the front of my 4450 MFWD, due to how much they lean on turns, but I"ve never seen smaller duals on the rear. When they"re in the mud and pulling, the strain would be the same anyway. Might be an axle defect. Have heard of hubs breaking when duals fill with mud. These duals are drive wheels from an old Case combine, held on with J-bolts through the square holes punched in the wheel center- able to torch them round without dismounting the tires or blowing the tube.
4450fntduals.jpg
 
A fellow here in the township has run duals on his for 30 plus years and has not suffered a break. Just a thought. Are the duals on year round? Are you maintaining proper tire pressure on the inside tire? Are you running a narrow driveway where there is continual stress on the dual because the inside wheel is not making ground contact?
 
Was it a Farmall 200 or similar tractor? It could be that the outer bearing was too loose. Broken axles on Farmall are sometimes caused by outer bearing having too many shims.
 
never seen a jd 4450 with duals. Do you have it turned up at all? i was always told front duals arent good on the frontend. Dont know if there is any truth to it. But nonetheless nice looking tractor!
 
donno -but my father-in-lwa had an axle on his Farmall 200 break for no apparent reason. Was just pulling it out of the barn. I have the tractor, but he's no longer with us, so can't tell me any details.
 
C, Super C, 200, 230, axles are a weak point. I have replaced at least five in my C and two Super C's over the last forty years. I have duals on the C, but haven't had any trouble since I put them on. If the duals were going to cause trouble I think it would be outside the inner bearing, or in the bearing itself. Unless of course you had it loaded down with all the weight you could hang on it, and were pulling more load than you should be.

Most of the axles I have broken, I did while plowing, or snowplowing. Heavy continuous load plowing, and lots of back and forth snowplowing, with chains on.
 
Had a neighbor in late 70s with front duals on a Deutz! He"d try anything. This one is inadvertantly turned up- pump sent fuel into the crankcase, had a rebuild put on, wanted it turned up 10% like usual. Jobber already sent it out, mechanic said it dyno"s 190, and if we really push it we can hit 240. 4450 is rated 145. Says just run the same load at the same speed and it"s ok. With the 15 speed, I can cruise along and in a tough spot, always pop it up 2 gears to make it through. I don"t run the front duals continuously- just in real wet Fall seasons, to get tillage done. This will be the puller for my tile plow when I get that built. I"ve seen the ice spurt out in peat ground some years, but it carries it through. Does put a bit of strain on the front when turning, even with the smaller size- steering is affected at low rpm.
 
Hi there, mirror image! I made the bands by cutting down bigger ones, pulling them together with a come-along. Dual barely leaves a track on level ground, pointing straight ahead. Lots of tip on the turns though. Got the front pair for $140.
 

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