Abstract: A self-propelled aircraft cargo belt loader is both propelled and operated hydrostatically. An engine, an electric motor, or a hybrid combination of both provides a power source to operate first and second hydraulic pumps. The first, or primary pump, provides variable fluid pressure used to propel the vehicle., while the second, or secondary pump, provides constant fluid pressure used to drive the conveyor belt, operate the hydraulic cylinders used to raise and lower the conveyor belt, and operate the vehicle's steering. The use of a hydrostatic drive system facilitates off-center placement of both the powerplant and the conveyor belt system, with the powerplant and conveyor belt system being positioned on opposite sides of the vehicle. As the powerplant is not covered by the conveyor belt system, engine access for maintenance and replacement is greatly enhanced.

Abstract: A self-propelled aircraft cargo belt loader is both propelled and operated hydrostatically. An engine, an electric motor, or a hybrid combination of both provides a power source to operate first and second hydraulic pumps. The first, or primary pump, provides variable fluid pressure used to propel the vehicle., while the second, or secondary pump, provides constant fluid pressure used to drive the conveyor belt, operate the hydraulic cylinders used to raise and lower the conveyor belt, and operate the vehicle's steering. The use of a hydrostatic drive system facilitates off-center placement of both the powerplant and the conveyor belt system, with the powerplant and conveyor belt system being positioned on opposite sides of the vehicle. As the powerplant is not covered by the conveyor belt system, engine access for maintenance and replacement is greatly enhanced.