Posted by rustyfarmall on February 02, 2010 at 06:43:37 from (209.152.78.140):
In Reply to: NF wedge-plate posted by caseyc on January 30, 2010 at 11:10:23:
Red Mist said: (quoted from post at 19:13:48 02/01/10) I've been through this discussion before here on the forum. I understand positive caster on a motorcycle (an exaggerated example is a long forked "chopper") and I understand positive caster on a car with upper and lower control arms - the ball joint on the upper arm being positioned behind the lower ball joint. In both those cases, the geometry causes the front tire/tires to return to center - or, putting it another way - to steer straight(er) or more true.
But, I still cannot get it through my head how installing the wedge with the thick end forward (moving the tire contact rearward in relation to the axis) can add positive caster. Seems to me it would reduce steering effort, but cause the tractor to be more apt to wander. Also seems to me if the wedge were installed with the thin end forward, turning effort would be slightly harder, but the wheels would be more apt to return to center and not wander as much. I'm sure I've probably got it backwards......
Either way, I have two wedges; one for the M series tractor and one for the H series. Neither is installed on a tractor. The M series wedge has no wording embossed on it. The H wedge has the word "Front" embossed on the thin end.
mike
Mike, you and I are in total agreement on this issue. That wedge has GOT to be installed with the narrow edge toward the front to produce "POSITIVE" caster.
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