Importance

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Abstract

A mine dusting machine having a specialized scoop constructed with a floor, opposite sides and ends and adapted for carrying substantially free-flowing particulate material, a powered ram on the scoop for pushing the material therein toward the front end of the scoop, a hydraulic motor powered auger conveyor mounted on the scoop adjacent said front end for transporting the material toward opposite sides of the scoop, separate material flingers mounted on said front end at least adjacent each of the sides and being hydraulically motor powered to receive the material transported thereto by the conveyor and then dispersing the material with considerable force in a generally arcuate pattern in a mine, wherein the motors are hydraulically connected in series to a pressurized hydraulic feed line and wherein each motor has a case drain port, a hydraulic return line connecting the last flinger motor of the series to a PTO, a primary check valve in the return line for preventing reverse flow therein, a motor case drain line connected into each case drain port of the series and connected into the return line upstream of the primary check valve, and a secondary check valve in the drain line intermediate its conjunction with the return line and the last of the flinger motors of the series for preventing over pressurization of the motor cases in the event of an operator caused accidental momentary reverse “HP” flow thru the primary, check valve which has become partially blocked open by dirt particles or the like in the hydraulic fluid.

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First Claim