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John Deere Tractors Discussion Forum
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4010 standard front axle

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2cylfarmer

09-08-2006 18:13:12




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I am working on a 4010 with a fixed tread front axle. I have the toe in set properly, but when we turn either direction, one wheel turns much further than the other. Lets say that you turn the wheel to the right, the right tire is about 45 degrees and the left is about 80 degrees. The left tends to dig when we are turning. It does it going either direction. The steering arms are correct, and I think that everything else is correct. I don't know if this is the nature of a standard front axle, but it does not seem right to me. Has anyone else had this situation?

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RalphinWI

09-09-2006 10:28:47




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 Re: 4010 standard front axle in reply to 2cylfarmer, 09-08-2006 18:13:12  
I read your note more carefully - If you saying the left wheel digs in when you turn in either direction then it suggests the left steering arm is shorter than the right.



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2cylfarmer

09-09-2006 19:37:05




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 Re: 4010 standard front axle in reply to RalphinWI, 09-09-2006 10:28:47  
I looked at the tractor today. The overall length of the tie rod is longer than the distance between the spindles. I will make some changes and try it again. What I should have said is that the outbaord tire will dig while turning.

Thanks



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Gerald J.

09-08-2006 18:42:01




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 Re: 4010 standard front axle in reply to 2cylfarmer, 09-08-2006 18:13:12  
I think the steering arms are on the wrong splines. They point to the rear and the distance between the tie rod ends should be less than the distance betweeen the spindles. That's the geometry it takes to make the Ackerman steering work right.

Gerald J.



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RalphinWI

09-08-2006 21:31:11




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 Re: 4010 standard front axle in reply to Gerald J., 09-08-2006 18:42:01  
I have never worried about steering geometry, since it looked like it involved more calculus than I wanted to deal with at the moment. The tie rod must be shorter than the distance between the spindles, and when turning right the right wheel should be angled more than the left, the opposite of what is described. Possible explanations:
1. Replacing a broken tie rod with one too long, and inverting the steering arms to compensate.
2. I"m not sure what would happen if the tractor wheel base were changed by rotating the front axle 180 degrees about a vertical axis or having the rear wheels set wide with a fixed front end.
3. Does the 4010 have a differential lock? I drove a Ford 5000 that I seemed to have taken leave of steering rules, found out the differential lock would release only with moderate braking.
4. Has someone adopted the steering geometry of the Ford 8N to the 4010? The outboard wheel of our 8N always seemed to be skidding.

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2cylfarmer

09-09-2006 05:45:22




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 Re: 4010 standard front axle in reply to RalphinWI, 09-08-2006 21:31:11  
This tractor does not have a differential lock.
I am wondering if this tractor came out from the factory as a short wheelbase tractor, and someone has rotated the front axle to make it a long wheelbase. Possibly some of the tie rod linkage is different, and also should have been changed. I know it can be corrected, I am just stumped as to how to correct it.
I also have a 4010 row crop with an adj. front axle, and it steers just fine.

Mike

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Gerald J.

09-09-2006 08:24:50




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 Re: 4010 standard front axle in reply to 2cylfarmer, 09-09-2006 05:45:22  
Reading a book about Stirling engines late last night in the glossery it mentioned Ackermann steering. It said with wheels straight ahead the two steering arms should point at the differential on the rear axle. I don't think I got it that close but I learned to back trailers long before I could drive by building a truck with tinkertoys that had Ackermann steering that worked right. And the steering arms definitely did point inward from the wheels.

Gerald J.

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