CHAPTER 1: INTRODUCTION TM 9-2350-256-201-21 WINCHES, SPADE ASSEMBLY, AND HOISTING BOOM--Continuedb. SPADE ASSEMBLY1 Main winch2 SpadeThe spade (2) is mounted to the vehicle nosepiece by3 Hydraulic cylinderstwo trunnion-mounted arms. The arms are operatedby hydraulic cylinders (3) from within the winchcompartment. When not in use, the spade is secured ina raised position by a hydraulically activated, spring-loaded spade lock.c. HOIST WINCHThe hoist winch is mounted in the winch compartmentand is gear-driven by a hydraulic motor. The winch iscapable of hoisting a maximum load of 50,000 lb(22,680 kg) with a four-part line, using a 5/8-in. (15.88-mm) steel cable. The hoist winch is wound with 200 ft(61.0 m) of this steel cable.d. HOISTING BOOMThe hoisting boom is a tubular, modified A-frame, andis pivot-mounted to the top front of the vehicle. TheFigure 1-13. Main Winch and Spade Assembly.boom is raised or lowered by two hydraulicallyoperated boom cylinders. In operating position, the boom is supported by a stayline cable secured to crankarmslocated at the rear of the hull. The crankarms control the live-boom movement by means of hydraulicallyoperated stayline cylinders. In lowered position, the boom is secured on the boom support assembly by a boomtravel lock. The hoisting boom is used in conjunction with the hoist winch.1-30
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