This type of crane requires the boom to swing independent of the controls.

• A. Fixed cab (stationary controls)
• B. Mobile cab (remote controls)
• C. Hydraulic cab (adjustable controls)
• D. Rotating cab (joystick integrated)

Answer: (A)

Understanding how control layout affects boom movement is essential. With a fixed cab, the operator’s station remains stationary relative to the ground, and the boom’s swing is driven by a dedicated hydraulic circuit that is not tied to the cab’s orientation or the other control inputs. This means the boom can move laterally on its own, or be kept steady, without being affected by how the operator is seated or by the crane’s other movements. The result is that the boom swing operates independently of the main controls, which is important for precise positioning in confined spaces. In configurations where the cab rotates or where controls are integrated with the joystick or remote systems, the boom swing tends to be linked to those inputs and cab orientation, so it isn’t truly independent. Therefore, the fixed cab with stationary controls best satisfies the requirement that the boom swing be independent of the controls.