TM 5-3810-306-10Auxiliary Hoist. The auxiliary hoist provides power for allload raising and lowering operations when the auxiliaryboom nose is installed. Two hydraulic motors drive thehoist drum by means of a planetary gear reductionsystem. A disc brake is also an integral part of the hoistassembly. It operates automatically when the controllever is in neutral position.Control Lever Lockout System. The control lever lockoutwill automatically deactivate various control directions orfunctions which would tend to hasten an impendingoverload condition of the crane or two-block direction orcondition. The system consists of a solenoid controlledair cylinder, and the associated linkage and rods tolockout functions that may worsen the condition, i.e,boom down, telescope out or hoist up; therefore, whencontrol lever lockout occurs, the control levers can onlybe moved in a direction that will alleviate the condition.Lockout occurs when the solenoid is deenergized,closing an exhaust port and allowing air pressure to besupplied to the cylinder piston. Lockout is removed whenthe solenoid is energized, exhausting the air and allowingspring pressure to retract the cylinder piston.Swing/Boom Warning System. The swing/boom warningsystem provides a visual and audible warning to theoperator that the boom is not elevated sufficiently to clearthe engine hood when swinging the boom over the rear.The red warning light is located in the LED alert display.The light and buzzer are controlled by two micro-switches electrically connected in series. One switchsenses boom elevation and the other switch sensesboom position in relation to swing. If boomelevation is below 7.5 degrees and swing is initiated, thewarning indicator will illuminate and an alarm will soundwhen swing exceeds 90 degrees in either direction fromdirectly over the front.STEERING SYSTEMThe steering system uses hydraulically controlledsteering cylinders mounted to the axles. For maximummaneuverability, the front and rear axles are drive andsteer (axles). Two-wheel drive or four-wheel drive canbe selected. The front axle has full power steering. Therear axle utilizes full hydraulic control and is operatedindependently of the front steer via a control leveradjacent to the steering wheel.An electric motor driven, hydraulic pump providesemergency steering hydraulic pressure.AIR SYSTEMThe engine compressor provides the air supply tooperate the air service brakes, parking brakes, enginethrottle, and transmission range shift and rear axledisconnect. Air flow is transmitted from the carrier frameto the superstructure through a swivel located at thecenter of rotation.ELECTRICAL SYSTEMThe electrical system is a 24-volt operation and startingsystem, consisting of an alternator and four lead-acidbatteries, which are series-parallel connected. Thesystem is single wire-ground return type utilizing themachine’s structure as ground.1-11
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