Abstract: Down-force control is provided by a top-link, which presses down the rear end of a tool-bar carrying multiple rows of seeder tools. The height of the tool bar is set front and rear during operation. The top-link includes a hydraulic ram. The ram is supplied with pressure from a pressure-reducing-relieving valve, whereby the downward-force on the rear of the tool-bar remains constant during operation. The tool bar has side wings which are pressed down by a pressure that is regulated by the same valve. The system allows the seeder to maintain constant implantation depth, even over uneven ground.

Abstract: Many openers are mounted on the lateral tool-bar of a farm implement. For crop and fertilizer change, different spacings along the tool-bar are required for the openers. Multi-position tool-mounting structures are provided, for each opener as required. Each has a pivoting arm, which may be locked in one of several positions. The locked-in position of each arm may be changed manually, and independently of the other tools, upon manually releasing a biassed locking pin. Adjustment to cater to the next application is light, quick, simple, and accurate.

Abstract: The implement has a folding tool-bar, with a main section and wings. Hydraulic rams press the wings downwards relative to the main section during operation. Another ram presses the main-section downwards, reacting the force against a relatively weighty component, such as a air-cart. During non-operation, a carriage wheel is lowered, which raises the main section of the tool-bar off the ground. The wings also are raised clear of the ground. A sensor detects the position of the carriage wheel, and blocks movement of the wings downwards when the carriage wheel is lowered.