A crop harvesting machine comprising: a tractor having longitudinally opposed first and second ends (11A, 11B); a driver cabin on the tractor; ground wheels (12, 13, 14, 15) rotatably supported on the tractor for movement of the tractor in a working direction across the ground which carries a crop to be harvested; an engine and hydraulic pump mounted on the tractor for providing a pressurized fluid output; a header having an elongate support structure arranged across a width of the tractor extending from one end of the header to an opposed end of the header; the header including a cutter system extending across a width of the header for cutting a standing crop as the header is moved over the ground; the header including a hydraulic header drive system for driving at least the cutter system; a mounting assembly (21,22) carrying the header at a position forward of the first end of the tractor so as to support the header in movement over the ground as the tractor is moved in the working direction; the mounting assembly (21,22) mounting the header on the tractor for movements of the header relative to the tractor at least in a first direction upwardly and downwardly and in a second direction of twisting movement where said one end of the header is movable upwardly and downward relative to said opposed end; the mounting assembly (21,22) being releasable for disconnection of the header from the tractor; a flexible conduit assembly having one or more conduits having an extent from the tractor to the header for connecting the pressurized fluid from the tractor to the hydraulic header drive system; characterized in that there is provided a conduit support member for supporting the conduit assembly in at least part of the extent from the tractor to the header; wherein the conduit support member is connected at one end to one of the tractor and the header and being connected by a releasable coupling at the other end to the other of the tractor and the header; the conduit support member including articulation components (73, 79, 80) providing articulation of said one end relative to the other end so as to accommodate said movements of the header relative to the tractor; the conduit support member including support components (82A, 83A) providing support to the conduit assembly to prevent collapse thereof when said other end is disconnected from said other of the tractor and the header for disconnection of the header. a tractor having longitudinally opposed first and second ends (11A, 11B); a driver cabin on the tractor; ground wheels (12, 13, 14, 15) rotatably supported on the tractor for movement of the tractor in a working direction across the ground which carries a crop to be harvested; an engine and hydraulic pump mounted on the tractor for providing a pressurized fluid output; a header having an elongate support structure arranged across a width of the tractor extending from one end of the header to an opposed end of the header; the header including a cutter system extending across a width of the header for cutting a standing crop as the header is moved over the ground; the header including a hydraulic header drive system for driving at least the cutter system; a mounting assembly (21,22) carrying the header at a position forward of the first end of the tractor so as to support the header in movement over the ground as the tractor is moved in the working direction; the mounting assembly (21,22) mounting the header on the tractor for movements of the header relative to the tractor at least in a first direction upwardly and downwardly and in a second direction of twisting movement where said one end of the header is movable upwardly and downward relative to said opposed end; the mounting assembly (21,22) being releasable for disconnection of the header from the tractor; a flexible conduit assembly having one or more conduits having an extent from the tractor to the header for connecting the pressurized fluid from the tractor to the hydraulic header drive system; characterized in that there is provided a conduit support member for supporting the conduit assembly in at least part of the extent from the tractor to the header; wherein the conduit support member is connected at one end to one of the tractor and the header and being connected by a releasable coupling at the other end to the other of the tractor and the header; the conduit support member including articulation components (73, 79, 80) providing articulation of said one end relative to the other end so as to accommodate said movements of the header relative to the tractor; the conduit support member including support components (82A, 83A) providing support to the conduit assembly to prevent collapse thereof when said other end is disconnected from said other of the tractor and the header for disconnection of the header.