Abstract: A hydraulic control system for the rolling rack of a three table bale wagon wherein the rolling rack is movable along the third table for supporting tiers of bales deposited on the third table by the second table, the control system including a single acting hydraulic cylinder for positively advancing the rolling rack to a first position wherein the third table is ready to receive tiers of bales, apparatus for selectively connecting the hydraulic cylinder with a source of hydraulic fluid under pressure for extending the hydraulic cylinder and thereby moving the rolling rack to the first position, and including a fluid flow line; selective apparatus connected with the fluid flow line for intermittent release of fluid pressure from the fluid flow line so that when mechanical pressure is exerted against the hydraulic cylinder in such a manner as to urge retraction of the cylinder, the retraction may be controlled by intermittent release of pressure from the fluid flow line.

Abstract: Tier pattern selection on the disclosed bale wagon involves periodic rotation of a memory element in the form of a cam plate relative to a cam follower which is connected to means on the bale wagon which will cause the tier pattern selected to be formed. The cam plate is rotated through successive predetermined displacements to successively bring respective peripheral lobes on the cam plate into engagement with the cam follower in a desired sequence. Accurate rotation of the cam plate is facilitated by an electric motor drivingly interconnected to a sprocket mounted on the cam plate shaft, a series of switches and circuitry which interconnects the motor with an electrical power source on the bale wagon.