Mike, The positive and negative caster idea can be confusing. The location of the contact patch of the tire on the road compared to the orientation of the axis on which the steering wheel turns is the basis for positive caster. Take a caster wheel on a shopping cart. The pivot on which it turns is vertical. the contact patch is an inch behind the point on the floor through which the pivot would project (its axis). This is positive caster. and is just the same on the Farmall. On a Motorcycle, the rake angle of the steering head is tilted toward the back on top. This gives positive caster by projecting that axis out in front of the tire contact patch (causing self centering, with differing amounts for different rake angles. all the way to the rediculous angles found on extreme choppers that do not steer well) So positive caster is more distance between the point of axis and the contact patch, and less happens until there is none, at which point the axis and contact patch are on the same center. Negative caster would be if the contact patch was in front of the axis, then the wheel would want to turn around and follow (like on a shopping cart) Though narrow fronts have two wheels, the effect is the same as though it had one. (think of a chair caster with two wheels). In cars we adjust the ball joint location (to the front to lessen, and the rear to increase caster). I hope this makes sense out of it. JimN
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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