Abstract: A hydraulic lift/flotation system for the header of a crop harvesting machine wherein each side of the header is supported by a single cylinder, which performs both the flotation and lift functions. For even lifting and flotation of an unbalanced header, each cylinder has its own control valve, pump, and accumulator. The operator sets the desired flotation force by actuating rocker switches; one switch position allows hydraulic oil to enter an accumulator to reduce header contact force with the ground. The other position allows oil to exit the accumulator to increase header contact force with the ground. To evenly float an unbalanced header, separate switches adjust each side independently. Once the flotation forces are set, the control valves will return to this preset flotation condition whenever float mode is selected, regardless of subsequent header lift and lower operations.

Abstract: A digging chain is provided with a plurality of trencher or digging teeth mounting brackets at spaced intervals around its periphery. Each mounting bracket is secured to the digging chain by spaced apart adaptor links and pin connections. The mounting bracket includes a base having opposed end surfaces, opposed side surfaces, and a top surface for mounting a trencher or digging tooth cutter bit. A one-piece mounting member is attached to the underside of the base for permitting the base to be securely attached to the upper ends of the adaptor links. The mounting member is generally in the shape of a "W" in longitudinal cross-section and includes opposed leg portions that are secured to the end surfaces of the base. The upper terminal end of the mounting member's mid-portion is secured to the underside of the base, and the lower end of the mounting member forms a pair of mounting slots or grooves that fit between the opposed, spaced apart adaptor links for attachment thereto.