| 摘要 |
A hydraulic drive control device capable of transforming a hydraulic pressure loss reduction effect to a fuel consumption reduction effect that can be most easily realized by a user. A hydraulic drive control device has a drive hydraulic circuit and a quick return circuit (42). The drive hydraulic circuit drives a hydraulic actuator (11) by charging and discharging pressurized oil discharged from a hydraulic pump (17) driven by an engine (16) to and from the hydraulic actuator (11) through control valves (22, 25). The quick return circuit (42) directly re-circulates a part of hydraulic oil discharged from the hydraulic actuator (11) to a tank (38) as the actuator (11) is driven. Engine control means (21) for controlling output of the engine (16) is provided, and the engine control means (21) suppress the output of the engine (16) when the quick return circuit (42) is opened.
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