The first part of any hydraulic system is the power unit. This consists of a hydraulic pump, a reservoir, some sort of motor to turn the pump, and usually some kind of manifold to organize the fluid going out and coming in.
he Bud Box was designed to use the natural instinct to turn around when trapped, combine it with flight zone control, and get the cattle to move into the alley opening without having to apply any physical force or yell at them. Simple body position of the man on foot or horse is enough.