To provide a hydraulic drive whose field area is reduced and structure is simplified by positioning the hydraulic motor closely to a directional control valve and integrating the directional control valve and an unloading valve.
A suction valve 13 is arranged upstream from a directional control valve 12 for guiding pressure oil only to a pump discharge pipeline 7. Because the suction valve 13 can be arranged upstream from the directional control valve 12, the auxiliary machinery (a relief valve 4) other than the suction valve 13 can be simultaneously arranged upstream of the directional control valve 12. Each auxiliary machinery which is conventionally arranged downstream from the directional control valve 12 can be arranged upstream from the directional control valve 12, so that a hydraulic motor 1 and the directional control valve 12 can be arranged closely.
YOSHIDA NOBUSANE
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