Patent ID: 8051916

Claim:
A rear wheel drive assist for a wheel tractor scraper, the wheel tractor scraper having a front wheel and a rear wheel, the rear wheel drive assist system comprising: a work tool pump fluidly connected to a fluid operated work tool motor, the work tool motor being operatively connected to a work tool; a fluid operated drive motor operatively connected to the rear wheel; a diverter valve selectively movable between a first position and a second position, wherein when the diverter valve is in the first position, fluid flow is delivered from the work tool pump to the work tool motor and fluid flow is prevented from the work tool pump to the at least one fluid operated drive motor, and wherein when the diverter valve is in the second position, fluid flow is delivered from the work tool pump to the at least one drive motor; and a controller configured to control operation of the diverter valve, including when the rear wheel drive assist is engaged, controlling the diverter valve to the second position to provide fluid flow to the fluid operated drive motor to drive the rear wheel to assist the front wheel in propelling the wheel tractor scraper, and when the rear wheel drive assist is not engaged, controlling the diverter valve to the first position to allow fluid flow to the work tool motor and prevent fluid flow to the fluid operated drive motor connected to the rear wheel while the front wheel propels the wheel tractor scraper.