Which of the following is the driving device of the stacker?

The driving device of a stacker is primarily a manual transmission, which is designed to provide the operator with direct control over the vehicle’s speed and maneuverability. In a stacker, the manual transmission allows for fine-tuning of the speed when lifting and transporting loads, which is essential in warehouses and storage areas where navigation around obstacles and precise placement of heavy goods is necessary.

This option indicates a system where the operator has to shift gears manually to drive the stacker, providing greater control over the vehicle's performance in various situations, such as tight spaces or on inclines. The operator can engage and disengage different gears based on the load being carried and the terrain, allowing for more versatile operation compared to other driving systems.

Automatic transmissions generally provide less direct control over the machine’s operations and are not as common in stackers, which require a level of operational awareness and adaptability that manual systems offer. Hydraulic control and pneumatic systems, while important for lifting and lowering loads, do not function as the primary driving mechanism of the stacker. Instead, these systems work in conjunction with the driving device to facilitate the movement and operation of the stacker's lifting abilities.