Profile: Granco Mfg., Inc. manufactures rotary pumps and parts. Our pump design provides excellent fluid displacement without the use of gears, blades, vanes, paddles, scoops, pistons, valves or stators makes it the perfect design for stationary or truck-mounted applications. Our rotary ball pump can move a tremendous variety of fluids with viscosities ranging from 30 to 1,000,000 SSU without modification of standard clearances. We developed a new hydraulic motor mount for use on fluid transfer pumps on truck-mounted units.