The Yeomans GP39 Series is a versatile and economical plow frame designed for general-purpose use with small or low-horsepower tractors. Featuring 22" shanks and a 39" beam spread, it delivers effective subsoiling while minimizing soil disturbance between shanks.
Coulters
Coulters are castoring disc attachments fitted in front of the shank to assist pasture renovation and cultivation where surface cover is present. By opening the surface ahead of the shank, coulters help maintain the Yeomans philosophy of minimal soil profile disturbance, allowing the shank to lift and loosen the soil below while the surface remains comparatively intact. This makes coulters particularly suitable for pasture renovation, oversowing, and applications where surface structure is to be preserved rather than aggressively cultivated.
Coulters are recommended in:
- Densely matted pastures where grass roots spread laterally near the surface rather than penetrating deeply.
- Old or compacted grazing paddocks with a tight grass mat
- Irrigated or high‑rainfall pastures where surface root density is high
- Pastures with vine‑type or surface‑creeping plants, where coulters prevent material building up on the shank and frame
Crumble Roller
The Yeomans Crumble Roller is designed to improve surface finish, and leave paddocks level and consolidated after subsoiling by breaking down surface clods and improving seed‑to‑soil contact. It is particularly valued in pasture renovation, irrigation country, and finishing work where soil structure is being improved without excessive surface disturbance.
As Yeomans shanks are designed to efficiently pull themselves into the soil, the crumble roller provides a controlled counterforce that improves consistency and reduces unnecessary draft load on the tractor.
Use of a crumble roller has been shown to:
- Improved soil aggregation and surface stability
- Reduce surface roughness and clodding after deep ripping
- Increase moisture retention by closing large air voids near the surface
- Improve seed‑to‑soil contact when oversowing pasture or using a Tickle‑Pot Seeder in the same pass
- Produce a friable, medium‑textured soil finish suitable for follow‑on operations
Digging Points and Shank Replacements
GP39 Series
Frame Width:
6ft, 8ft, 10ft
Tractor HP:
50-100
Shank Spacing:
13",17.5", 20", 21.5"