What type of stacker features the front wheel as the driving wheel equipped with a differential gear device?

The type of stacker that features the front wheel as the driving wheel equipped with a differential gear device is the counterbalance lift truck. The design of a counterbalance lift truck allows it to balance the weight of heavy loads effectively, with the drive mechanism located at the front.

The differential gear device is crucial in providing better maneuverability and control, especially during turns, because it allows the outer wheel to rotate faster than the inner wheel as the truck navigates corners. This design enhances stability and ensures smooth operation when handling loads, making counterbalance lift trucks ideal for various warehouse and material handling applications.

In contrast, the other types of stackers mentioned have different operational designs. Reach trucks typically have a different configuration to extend their forks, order pickers are designed for retrieving items from shelves, and side loaders are built to lift and transport loads from the side, which influences their wheel arrangement and drive mechanisms.