FREELY ROTATABLE CLOSED GRAPPLE HEAD AND MACHINE USING SAME

摘要

A machine (10) includes a chassis (12) and a boom assembly (14). The boom assembly (14) is movable relative to the chassis (12). The machine (10) fur ther includes a grapple assembly (16) suspended from the boom assembly (14). The grapple assembly (16) comprises a grapple head (18) fluidly connected t o a first hydraulic circuit (57) for actuating the grapple head (18) to a gr asping configuration, and a hydraulic motor (24) fluidly connected to a seco nd hydraulic circuit (71) for rotating the grapple head (18). The second hyd raulic circuit (71) includes a bypass valve (72). The bypass valve (72) has a first position configured to block a fluid flow between a first port (64) of the hydraulic motor (24) and a second port (66) of the hydraulic motor (2 4). The bypass valve (72) also has a second position configured to allow a f luid flow between the first port (64) of the hydraulic motor (24) and the se cond port (66) of the hydraulic motor (24). The bypass valve (72) allows the grapple head (18) to rotate freely when the grapple head (18) is in a grasp ing configuration.