S41 final drive problems - The Combine Forum
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post #1 of 16 (permalink) Old 10-15-2019, 10:08 PM Thread Starter
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S41 final drive problems

I am having a problem with the s41's on my 560c Challenger and I thought I would ask you Gleaner guys what you thought of this. 2 years ago I broke the axle mounting ring off the axle on the right hand side. Replaced with a s42. I just broke the left side the other day. Same deal axle ring breaks off inside the lug bolt circle. Once again replaced with a s42. Agco says they do not have a problem. Combine is a '12 with 1050 engine hrs. 620x70x42 duals. Outside tire 10 psi less than inside. Any idea what is going on here? Thanks.

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post #2 of 16 (permalink) Old 10-16-2019, 12:40 AM
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looks like it broke at the radius for the wheel center pilot. Poor engineering. BIGGER RADIUS!!!

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post #3 of 16 (permalink) Old 10-16-2019, 12:48 AM
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Tyre with less pressure has more grip as much larger effective contact area than higher pressure inside tyre.
When turning, outside tyre will try to drag inside tyre but that one is carrying more load, something has to give.

Keep all tyres at same pressure to share load evenly. or remove duals.
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post #4 of 16 (permalink) Old 10-16-2019, 09:28 AM Thread Starter
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Yes it broke at the radius I guess. You can see convex and concave mounting/centering area all the way around where the 2 peices were put together and then welded or fused somehow. Can't really tell how they were joined.

Tire pressure. I was always told and Agco reccomends lower pressure on the outside dual but maybe your on to something. I don't know.
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post #5 of 16 (permalink) Old 10-16-2019, 10:16 AM
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These photos are from 2017 and 2018 on a S77. I also have 620/70x42 duals and run 28 psi inner and 20 psi in the outer tires. Why canít Agco be like everyone else and move their planetary out so axles is centred between duals. They will do it when some unfortunate sole is roading down the highway and breaks one and kills a few people. When they break itís a instant 90 degree turn to direction of travel. When your roading I wouldnít take it out of second gear.
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post #6 of 16 (permalink) Old 10-16-2019, 10:22 AM
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I can't imagine that stub shaft isn't one piece. Hard to imagine that breaking so true like that but i don't think it is a two piece manufactured part "put" together. Maybe the smart new engineers have better ways? NOT!!
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post #7 of 16 (permalink) Old 10-16-2019, 10:28 AM
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Snipe's post showed while I was typing....at least they are consistant! Wonder how Glenn gets by on those slopes cutting wheat.Don't remember him busting one but don't know how he avoids it.
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post #8 of 16 (permalink) Old 10-16-2019, 10:43 AM
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Looks like it breaks right where the step is cut for the centering of the wheel. Is it a sharp 90 deree cut into the corner of that cut? If there isnt a nice radiused smooth transition that is a major stress riser spot. Always used to break axles on circle track car running stock axles. Same type of deal sharp edge and always broke there. Started smoothing and polishing that out with a die grinder and flap wheel and never had one fail after that. Crank shafts, same deal when grinding them. But also agree on the design and wheel dish. That is a insane amount of leverage. Kind of amazing there isnt more failures. After looking at our s78 i see they also have a step machined on the back side that is pry straight across from the one on the other side. Id be willing to bet this is what is leading to the problem.

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post #9 of 16 (permalink) Old 10-16-2019, 11:08 AM Thread Starter
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Quote:
Originally Posted by stevemcil View Post
I can't imagine that stub shaft isn't one piece. Hard to imagine that breaking so true like that but i don't think it is a two piece manufactured part "put" together. Maybe the smart new engineers have better ways? NOT!!
If it is not 2 pieces they break at a perfect concave/convex line. I still say it is 2 pieces put together somehow.
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post #10 of 16 (permalink) Old 10-16-2019, 01:37 PM Thread Starter
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Originally Posted by Smallchev View Post
Looks like it breaks right where the step is cut for the centering of the wheel. Is it a sharp 90 deree cut into the corner of that cut? If there isnt a nice radiused smooth transition that is a major stress riser spot. Always used to break axles on circle track car running stock axles. Same type of deal sharp edge and always broke there. Started smoothing and polishing that out with a die grinder and flap wheel and never had one fail after that. Crank shafts, same deal when grinding them. But also agree on the design and wheel dish. That is a insane amount of leverage. Kind of amazing there isnt more failures. After looking at our s78 i see they also have a step machined on the back side that is pry straight across from the one on the other side. Id be willing to bet this is what is leading to the problem.
After looking at mine some more I think what you are seeing on the backside is actually a milled down weld that holds the pieces together. I think there is a convex on the axle that mates to a partial concave on the ring that centers everything and is veed out and welded then the top of the weld is milled flat. It looks like mine has poor penetration which is probably the problem along with the leverage.

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