TM 9-2350-256-34-2trapped between adjacent vanes as they move pastthe inlet chamber. The fluid is then carried alonga path of constant radius to the outlet chamber inthe pressure plate. At this point, the radius ofthe cam ring’s elliptical contour decreases, forcingthe fluid into the outlet chambers through pressureplate ports and through the outlet ports. Pumpoutput high pressure is directed to the winches andcylinders to operate them.e. Hoisting Boom Assembly.(1) Detailed description. The hoisting boomassembly (fig. 1-12) consists of a tubular steel A-frame, two boom-actuating cylinders, and two stay-line cylinders. The A-frame, or boom (fig. 1-13),is installed on top of the vehicle hull and is raisedor lowered by means of controls within the crewcompartment. The boom-actuating cylinders (fig.1-13) are located within the vehicle on either sideof the crew compartment. They are single-end rod,double-acting, hydraulic cylinders which extend toraise the boom and retract to lower it. The twostayline cylinders (fig. 1-13) are identical to theboom cylinders and are located at the rear of thevehicle. They work in unison with the boom cylin-ders to provide four feet of back-and-forth boomtravel in the raised position.(2) Operation.(a) Raising the boom. With the power con-trol valve ON, the boom combination control valvein the FORWARD position, and the boom safetyFigure 1-12. Hoisting boom assembly-tight side view.Change 71-15
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