Patent ID: 7854402

Claim:
A mine dusting machine having a specialized hopper or scoop bucket having a floor, opposite sides and front and rear ends and adapted for carrying substantially free-flowing particulate material, a powered ram on the hopper for pushing said material therein toward said front end, a powered auger conveyor mounted on the hopper adjacent said front end for transporting said material toward said sides of the hopper, separate flingers mounted on said front end at least adjacent each of said sides and adapted to receive material transported to said sides by the conveyor, each said flinger having at least one rotatable blade for dispersing said material with considerable force within the mine, said conveyor means and flingers being powered by separate hydraulic motors which are adapted for connection in series—conveyor motor first—to a pressurized hydraulic feed line, wherein the design operating pressures of said conveyor motors and its output shaft seal are higher than those of said flinger motors such that reverse operation of said motors is to be avoided, each said motor having a case drain port, a hydraulic return line connecting the last flinger motor of the series to a hydraulic reservoir, a primary check valve in said return line for preventing reverse flow therein, a motor case drain line connected into each case drain port of said series and then connected into said return line upstream of the primary check valve, a secondary check valve in said drain line positioned intermediate its conjunction with said return line and the last of said flinger motors of said series for preventing over pressurization of the motor cases and shaft seals in the event of an accidental momentary reverse “HP” flow thru said primary check valve and return line, and wherein a manually operated directional control valve is provided on said machine and connected to said feed and return lines for allowing an operator to direct the flow of high pressure hydraulic fluid to either the feed line or the return line for also running other auxiliary equipment in forward or reverse direction.