Flotation for agricultural implements

An agricultural implement apparatus comprising:

• a frame supported on rear wheels and right and left flotation front wheels for movement along the ground in an operating travel direction, and a plurality of ground engaging tools mounted on the frame substantially equally on each side of a frame axis extending parallel to the operating travel direction;
• wherein the right and left flotation front wheels are pivotally mounted to the frame about corresponding substantially vertical right and left wheel pivot axes;
• a hitch tongue having a rear end pivotally attached to a lateral mid-point of the frame about a substantially vertical hitch pivot axis located substantially on the frame axis, and having a front end adapted for pivotal attachment to a drawbar of a towing vehicle by a substantially vertical drawbar pin;
• a wheel control mechanism connecting the right and left flotation front wheels to the hitch tongue such that pivotal movement of the right and left flotation front wheels about the corresponding right and left wheel pivot axes follows pivotal movement of the hitch tongue about the hitch pivot axis;
• the wheel control mechanism configured such that when the hitch tongue is in a neutral position aligned with the frame axis, the right and left flotation front wheels are oriented to roll in the operating travel direction, and pivoting the hitch tongue about the hitch pivot axis away from the neutral position causes the right and left flotation front wheels to pivot about the corresponding right and left wheel pivot axes;
• and
• right and left flotation outboard front wheels mounted to the frame about substantially vertical wheel pivot axes, and a control linkage connecting the right and left flotation outboard front wheels to the hitch tongue such that moving the hitch tongue away from the neutral position in a selected direction turns the flotation outboard front wheels in the selected direction.