HYDRAULIC SYSTEM OF SELF-PROPELLED AGRICULTURAL MACHINE Russian patent published in 1996 - IPC

FIELD: agricultural engineering. SUBSTANCE: hydraulic system of industrial crop harvesting machine has control manifolds 16 and 17 of blocking servo cylinder 15 and two blocks of controlled return valves 18 and 22, which are connected in series with control manifolds. Return valves are interconnected in series or in parallel within manifolds at the side of their locking members. The number of valves in each block is equal to the number of hydraulic cylinders of controlled working tools 7, 8 and 9. Breakage of working tools is eliminated by preventing return stroke of these tools in the process of lowering. EFFECT: increased efficiency, wider operational capabilities and enhanced reliability in operation. 2 dwg