Section III - TECHNICAL PRINCIPLES OF OPERATION

TM-5-3810-306-10 Container Crane 40-Ton Rough Terrain Model RTB75CC Manual
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TM 5-3810-306-10 Section III - TECHNICAL PRINCIPLES OF OPERATION INTRODUCTION This section contains functional descriptions of the operation of the crane’s major subsystems. Emphasis is on how the operator’s controls interface with the rest of the equipment. HYDRAULIC SYSTEM The hydraulic system provides adequate pressure and volume for simultaneous operation of various crane functions. It consists of two pumps, a reservoir, an oil cooler and control valves. The 165-gallon (624 liter) hydraulic reservoir is located on the right side of the frame. A full flow return type 25- micron filter and a sight gauge are installed in the reservoir. Pumps. The crane utilizes one three-section pump and one two-section pump. Two pump drive assemblies transmit power from the torque converter to the hydraulic pumps. The three-section pump can be disengaged from the engine for cold weather starting. This is accomplished by a PUMP DISCONNECT lever located on the pump. Pump engagement must be performed with the engine shut down. Directional Control Valves. The directional control valves are four-way, three-position with either an open or closed spool. The valves are grouped into valve banks permitting simultaneous, independent control of crane functions. The closed spool type valve contains an integral load check valve to prevent back sliding of components which support heavy loads. Each bank contains a main relief valve. Certain crane functions are additionally protected by a circuit relief valve. Outriggers. The outriggers, part of the carrier frame, are controlled and operated from the cab. They are full hydraulic, double box type. When positioned they provide a rigid four-point platform (fully extended and set) capable of supporting the machine and its maximum load capacity. Integral holding valves and floats are provided. A sight level bubble indicator is located in the vicinity of the outrigger control panel to assist the operator in leveling the crane. Turntable Assembly and Swing Mechanism. An anti- friction roller bearing supports the superstructure on the carrier frame, allowing 360 degrees of continuous rotation (swing) in either direction. Swing is accomplished by a hydraulically-driven motor driving a gearbox which in turn drives the roller bearing. A hydraulically actuated brake is used to stop swing and hold the superstructure in the desired position. To further secure the superstructure in a desired position, a positive swing lock is also provided. Boom Assembly. The boom assembly is a two-section, trapezoidal design and extends from 34.4 to 60.4 feet (10.52 to 18.46 meters). The boom is elevated by two hydraulic cylinders with integral holding valves. Boom elevation is from -4 degrees to +80 degrees. Main Hoist. The main hoist provides power for all load raising and lowering operations. Two hydraulic motors drive the hoist drum by means of a planetary gear reduction system. A metallic disc brake is also an integral part of the hoist assembly, and operates automatically when the control lever is in neutral. 1-10

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