| 摘要 |
<p>A control means for a hydraulic motor (11) comprises a directional valve (12) for communicating hydraulic pressure fluid from a pressure source (10) to the motor (11) and including pilot pressure operated activating means (13, 14), pilot valves (17, 18) connected to the activating means (13, 14) and to the pressure source (10) and a manually operable activating lever (15) mechanically connectable to the directional valve (12) via a coupling (24, 55, 56). A pressure fluid operated actuating means (25, 47, 48) is associated with the coupling (24, 55, 56) to shift the latter when pressurized from an engaged condition and a disengaged condition, and a mode shifting valve (19) is connected both to the actuating means (25, 47, 48) and to the pilot valves (17, 18) and arranged to pressurize simultaneously the pilot valves (17, 18) and the coupling (24, 55, 56) disengaging actuating means (25, 47, 48) to avoid double activation of the directional valve (12). <IMAGE></p> |
