Container unloading system

A system for unloading material from a container, the container having a floor and a pair of substantially parallel sidewalls, said system comprising:

• an auger rotatable about an axis and extending in a direction substantially parallel to the sidewalls of the container;
• a first fluid motor on said auger for rotating said auger about the axis to convey material in the container toward one end of the auger;
• mounting means for mounting said auger to advance transversely across the floor of the container between the sidewalls, beneath the material in the container, and in a direction substantially perpendicular to the sidewalls;
• drive means including a second fluid motor for driving said mounting means to advance the auger transversely back and forth across the floor and adjacent the bottom of the material in the container while said auger is rotating;
• conduit means connecting the discharge of said first fluid motor to said second fluid motor;
• bypass conduit means communicating with said conduit means and bypassing said second fluid motor;
• and
• resistance sensing means, including relief valve means in said bypass conduit means, which senses the resistance to the transverse movement of the auger by the material in the container to bypass fluid by said second fluid motor in response to the resistance to vary the speed of the transverse movement of the auger across the floor of the container.