| 摘要 |
A pilot valve control for the drive motors of an excavator utilizes four pilot valves, each of which has a linear actuable plunger. A control body having a cam type member is mounted on a universal swiveling connection so that in a centered position none of the plungers are moved to actuate the respective valves, but upon tilting of the control body the plungers are actuated. A motion alarm actuator is connected to the control body and is associated with a normally closed switch so that in a centered position of the control body the normally closed switch is held open, but when the control body moves to any one of its positions actuating a pilot valve, the switch, which forms an alarm switch, moves to its normally closed position.
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