| 摘要 |
What is proposed is a hydraulic apparatus (17) for a tractor (10) with rear and front implement-mounting devices (11, 13), which allows a substantially parallel control and regulation of a front power lift (15) in addition to a rear power lift (16). In a regulating position, serving as a lowering position (36), of a directional valve (19) assigned to the front power lift (15), the front power lift (15) is connected to the connection for regulated pressure (39) of a pilot-controlled pressure-regulating valve (21), whilst its pressure-loadable run-on connection (41) is connected to a regulating directional valve (23) assigned to the rear power lift (16). The pressure in the front power lift (15) can thereby be regulated to be constant in parallel with the regulation of the power lift (16). To lift out the front power lift (15), the pressure regulation is overridden in a raising position (35) of the front directional valve (19), and with current to the rear lifting unit interrupted, pressure medium is conveyed to the front power lift (15). The sensitive lowering of the front power lift (15) is performed by the pilot-controlling pilot valve (47) of the pressure-regulating valve (21).
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