| 摘要 |
<p>PURPOSE:To provide a hydraulic work machine wherein an engine can be stably operated to attain extending its life without generating blinding of HC and CO gas in an exhaust emission control device. CONSTITUTION:A pressure detector 16 for detecting exhaust resistance of an engine 1 is provided in an inlet side of an exhaust emission control device 2, and when a detection value of the pressure detector is increased to a predetermined prescribed value or more, in a control device 17, an engine output value is increased so s to increase an exhaust gas temperature of the engine 1 to a temperature or more capable of normally displaying an exhaust emission control function provided in the exhaust emission control device 2, so that combustion of HC and CO gas choking the exhaust emission control device is accelerated. In order to improve safety by increasing an engine output only when placed in an opened condition a control valve 7 interposed in a delivery pipe line of a variable displacement oil hydraulic pump 4, a neutral detecting switch is additionally provided in an operating lever of the control valve, to supervise whether the control valve is placed in a neutral position or not.</p> |
