Patent ID: 7654778

Claim:
An improved system for moving material into and out of a trailer attached to a truck that is equipped with first and second high pressure hydraulic circuits, an airlock circuit, and a low pressure return line, said improvement comprising: a. a selector valve having first and second inputs for receiving said first and second high pressure hydraulic circuits, respectively, and respective first and second load outputs and first and second unload outlets, said selector valve being selectively operable between load and unload positions, wherein when in said load position said first and second inputs are fluidly connected to said first and second load outlets, respectively, and when in said unload position said first and second inputs are fluidly connected to said first and second unload outputs, respectively; b. a motor having first and second inputs that are fluidly connected to said first and second load outputs of said selector valve, and first and second outputs respectively connected to the low pressure return line and the airlock circuit, respectively; and c. a blower operatively connected to said motor.