| 摘要 |
An operator's cab for mobile earthworking machines such as drilling rigs, cranes and the like has interchangeable cab doors. One of the doors is flat or planar to reduce the exterior dimensions while the other is expanded or bulged to provide greater interior cab space when operating conditions permit. A hydraulic interlock system restricts certain machine operations when the bulged door is positioned to interfere with movement of other parts of the earthmoving machine.
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