Gauge wheel arm with split end and threaded bore

1. A row planter, comprising:

a frame,

a pair of discs on the frame to form a furrow in the ground;

a pair of gauge wheels each being adjustably mounted on the frame via an arm;

each arm having a split head with a first bore having threads substantially along its length and a second non-threaded bore transverse to the first bore;

the head having a slot extending from a perimeter edge to the first threaded bore;

each arm including an adjustment bushing having threads substantially along a full length of the adjustment bushing for threadably extending through the first threaded bore to variable distances so that the arm and gauge wheel is laterally adjustable from an initial lateral position to a second lateral position relative to the discs; and

each arm having a bolt extending through the second non-threaded bore and a nut tightenable on a threaded end of the bolt extending beyond the second non-threaded bore to clamp the adjustment bushing in the first threaded bore; and

whereby the nut is loosened to allow adjustment of the gauge wheel from the first lateral position to the second lateral position, and the nut is tightened to retain the gauge wheel in the first and second lateral positions; and

a pivot bolt extending through the adjustment bushing.

2. The row planter of claim 1 wherein the pivot bolt rotates within the adjustment bushing.

3. The row planter of claim 1 wherein the gauge wheels have an adjustable camber relative to the discs.

4. A mounting assembly for a gauge wheel on a row planter, comprising:

an arm having opposite first and second ends;

a bore extending through the arm at the first end and threaded substantially along its length;

a threaded bushing with threads extending continuously along substantially its full length to thread into the threaded bore;

a slot extending from an outer surface of the arm at the first end to the threaded bore so as to define a clamp with spaced tips on the first end of the arm;

a non-threaded hole extending through the clamp tips;

a first bolt extending through the hole; and

a nut threaded on the first bolt to tighten the clamp tips; and

the bushing being rotatable in the threaded bore when the nut is loosened to allow lateral adjustment of the gauge wheel relative to discs on the row planter;

and the bushing being fixed in the threaded bore when the nut is tightened to clamp the bore threads and the bushing threads together and thereby secure the gauge wheel in a selected position; and

a second bolt extending through the bushing and into a hole in the row planter to mount the arm and the gauge wheel to the row planter.

5. The mounting assembly of claim 4 further comprising a third bolt extending through the gauge wheel and through a hole in the second end of the arm.

6. A method of laterally adjusting a gauge wheel on an agricultural row unit, comprising:

mounting the gauge wheel on a first end of an elongated arm;

mounting a split second end of the arm to the row unit using a first bolt extending through a bushing having continuous threads threaded into a bore in the second end of the arm so that the threads of the bushing and threads of the bore matingly engage along a full length of the bore;

extending a second bolt through non-threaded holes in the split second end of the arm so that a threaded end of the second bolt is exposed and tightening a nut on the threaded end of the second bolt so as to clamp the mating threads of the bushing and the bore to fix the bushing against rotation in the bore so as to set an initial lateral position of the gauge wheel;

loosening the nut on the second bolt to allow the bushing to be turned in the threaded bore to adjust the lateral position of the gauge wheel; and then

retightening the nut on the second bolt to lock the gauge wheel in a second adjusted lateral position.

7. The method of claim 6 wherein the gauge wheel is adjusted without use of shims, jam nuts, or set screws.

8. The method of claim 6 wherein the second bolt clamps the bushing in the bore of the arm.

9. The method of claim 6 wherein the first and second bolts extend substantially perpendicular to one another.