Control system for the work-performing hydraulics of a motor vehicle, especially one which can be used in agriculture and civil engineering

摘要

Hydraulic control system for the work-performing hydraulics of a tractor, with a regulating control unit (27) for the power lift and at least one directional valve (1, 2) arranged in the feedline (24 to 26) leading to the regulating control unit (27) and having neutral circulation for the pressure fluid, this directional valve being provided with a latch (9 and 10, respectively) which can be engaged by spring force and disengaged by pressure fluid and, in the neutral position of the directional valve (1, 2), is acted upon by a pressure produced by the regulating control unit (27) in its rest position and relieves the directional control valve (1 and 2, respectively) for its actuation in the fine-control range. IMAGE