No Yeomans shanks are ever welded to the frame so shank spacings are always adjustable. This is absolutely essential for economical and effective subsoiling over different geological basses.
SHANK SIZES for smaller tractors in confined areas; the 22 Inch Shank is ideal (22 inch or 560mm under frame clearance). Bigger and heavier frames come equipped with 26 Inch Shanks with 660mm under frame clearance. For special applications there is also a 31 Inch Shank (790mm under frame) and in adjustable height shank, called the BIG-Y which is adjustable from 20 inches to 31 inches for inter row cultivation at different depths (518mm to 790mm under frame).
Shear Pin Replacement is Quick and Easy
SHEAR PINS are used on all rigid shanks and are simply a short piece of mild steel rod cropped to length. These protect both the shank and the plow frame. There are no expensive machined grooves in these pins. There are no drilled holes. These amazingly popular shear pins can be replaced in under forty seconds, using the drift supplied with the plow (a marlin spike works fine too), and a hammer. Roughly line up the shank and clamp plate, wack in the drift to tighten and align – slip in the shear pin and one wack removes the drift. And the job’s done; and the cost is negligible.
The pins never move but also never jamb. Pins don’t sheer until tip load exceeds approximately 3 tonnes for 22 INCH SHANK and 6 tonnes for all other shanks.
The sheer pin for the 22 INCH SHANK is 5 inches of half inch round, off the shelf mild steel rod (12mm by 125mm). All other rigid shanks use 6 inches of three quarter inch round mild steel rod (18mm by 150mm.)
It is the quickest to change and the cheapest to replace sheer pin in any system, on the market anywhere.