| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete pump that prevents an engine stall when the engine speed is adjusted to suppress fuel consumption and noise.SOLUTION: A concrete pump includes: driving cylinders 23, 24 expanding and contracting by hydraulic oil sent from a variable-capacity first hydraulic pump Pu1 driven by an engine En (a prime mover); pump cylinders connected to the driving cylinders; an operation unit RC for instructing at least the engine speed; a governor G (a rotational-speed adjuster) for increasing/decreasing the engine speed; a swash plate 70a (a discharge oil amount adjuster) for increasing/decreasing the displacement volume of the first hydraulic pump Pu1; and a control device C that outputs to the governor G and the swash plate 70a if the engine speed instruction by the operation unit RC is below a predetermined rotational speed. |
