Abstract
Measurements of forces acting on three-points fixed link hitch in rotary tillage were made. The characteristics of the forces in tilling were summarized as follows.
1. Upper link forces were tension and increased with the tilling depth, but they became compression over some depth or by use of the depth gage.
2. Lower link forces acted toward the tractor, but acted in the opposite direction when the tilling depth were large.
3. Lift rod forces were compression.
4. Forces acting on links were affected by the shape and size of link hitch, and the relative arrangement between rotary tilling attachment and tractor.
