| 摘要 |
<p>In a hydraulic circuitry the pumping means of which are driven by the engine of a farming tractor, the improvement consisting in that a second, ancillary pump (30) is connected mechanically with the main pump (10) of the circuitry, the delivery sides of both pumps (11, 31) being connectable in parallel to, or disconnectable from, one another by a valve (32) so as to match the different hydraulic power demands of one or more hydraulic actuators (14) borne by the tractor for actuating corresponding tilling implements. <IMAGE></p> |
