Patent ID: 8061466

Claim:
A wheel tractor scraper, comprising: a tractor portion having a power source drivingly connected to at least one front wheel; a scraper portion pivotally connected to the tractor portion, the scraper portion having a bowl, and a first and a second rear wheel disposed on opposite sides of the scraper portion; a work tool connected to the scraper portion and configured to load the bowl; a work tool pump fluidly connected to a fluid operated work tool motor, the work tool motor operatively connected to power the work tool; and a hydraulic rear wheel assist, comprising: a first hydraulic drive motor operatively connected to the first rear wheel; a second hydraulic drive motor operatively connected the second rear wheel; a diverter valve selectively movable between a first position at which fluid flow is delivered from the work tool pump to the work tool motor and a second position at which fluid flow is diverted from the work tool pump to the first and second drive motors, wherein when the diverter valve is in the second position, fluid flow from the work tool pump to the first and second drive motors is prioritized over fluid flow from the work tool pump to the work tool motor; and a controller configured to deliver a diverter control signal to move the diverter valve between the first position and the second position, the controller further configured to determine a front wheel speed, to determine a rear wheel speed, and to modify the rear wheel speed to match the front wheel speed.