KREISLAUF FUER EINEN HYDRAULISCHEN ANTRIEB.

摘要

A hydraulic drive circuit system is equipped with an accelerator pedal (2) and an accelerator lever (21) for respectively instructing target revolution numbers for an engine (1), a link plate (24) for selecting greater one of the instruction values, and a linkage (29) and a switch (30) for controlling valves (27,28) respectively so as to close the flow passage of a line (26) interposed between a charge pump (4) and a low pressure line (12) irrespective of the instruction value of the accelerator pedal (20) when the accelerator lever (21) has not been controlled but for controlling the valves (27,28) so as to restrict the flow passage of the line (26) in accordance with the instruction value of the accelerator pedal (20) when the accelerator lever (21) has been controlled.