| 摘要 |
<p>A pump failure alarm system which is provided in a hydraulic working machine comprising hydraulic pumps (1A, 1B) driven by a prime mover, delivery lines (4A, 4B) joining with one another into one common delivery line (3) on the downstream side, check valves (6A, 6B) provided in the delivery lines upstream of a point where the delivery lines join with one another, a hydraulic cylinder (10) driven by a hydraulic fluid introduced through the common delivery line, and a hydraulic reservoir (14). The pump failure alarm system comprises pressure sensors (33A, 33B) for detecting respective delivery pressures of the hydraulic pumps, bypass lines (35A, 35B) having one ends connected to the delivery lines at points upstream of the check valves and the other ends connected to the hydraulic reservoir, solenoid switching valves (38A, 38B) for opening and closing the associated bypass lines, an alarm display unit (40) for giving an alarm in correspondence to each of the hydraulic pumps, and a controller (41). &lt;IMAGE&gt;</p> |
