| 摘要 |
PURPOSE:To raise the efficiency of operations by operating a maximum revolving number varier and a maximum discharge volume varier according to set values by a setting and selecting means on the basis of output signals from a discriminator, and indicator, and a sensor. CONSTITUTION:Output signals of switches 32 and 33 and output signals of pressure switches 34a and 34b are put in the arithmetic unit of a controller 35. In the arithmetic unit, whether or not traveling condition is preferentially set, e.g., whether or not a traveling motor 1 is in operation is discriminated output signal from the pressure switch 34a. In the case of the traveling condition, a maximum revolving number varier 30 and a maximum discharge volume varier 31 are driven according to indications of heavy excavation (P-mode), light excavation (E-mode), high-speed traveling (H-mode), and low-speed traveling (L-mode) by the switches 32 and 33. Also, in either case of no traveling condition and no other operating condition, when the lapse of 2.5sec, for example, is confirmed by a time confirmer, P-mode or E-mode is selected by indication of the switch 32. |
