ELECTRICAL SYSTEM

TM-5-3810-306-20 Container Crane 40-Ton Rough Terrain Model RTB75CC Manual
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TM 5-3810-306-20 Electrical Swivel The electrical swivel center or collector ring assembly is secured by setscrews to a center post which is bolted to the spool of the air/transmission swivel. This allows the collector ring assembly to remain stationary with the chassis. The outer portion or brush assembly is spring mounted on two pins which are located on a mounting plate welded to the air/transmission swivel barrel. This allows the brush assembly to rotate with the superstructure. The springs on the mounting plate pins allow the swivel to float and not bind when the superstructure rotates. Electrical power is transferred to and from the carrier and superstructure through the electrical swivel. The swivel has 42 slip rings. SUPERSTRUCTURE Distribution Panel All electrical circuits are protected, and some controlled, from the printed circuit board (circuit breakers) located in the cab right side panel. The printed circuit board consists of a harness with four connectors, six relays, nine circuit breakers, and a flasher. The relays are energized to close their contacts any time the ignition switch is in the ON or ACC position. Instrument Panel The instrument panel is located in the cab section of the crane. It contains all of the controls and indicators that the operator will use during crane operation. Additional information on the instrument panel and it’s controls and indicators can be found in the Operator’s Manual TM 5-3810-306-10. Alarms The backup alarm is located above the pintle hook on the carrier. It serves as a warning to personnel that the crane is traveling in reverse. Superstructure Lighting Two lights mounted in the crane’s superstructure are the cab floodlight and boom floodlight. The cab floodlight is located on the outside of the cab and is controlled by the operator by a swivel handle inside the cab. The boom floodlight is mounted on the telescoping boom and is used to illuminate the work area and hook block during night operations. CARRIER FRAME Sending Units and Switches The electrical system provides electrical power to a variety of sending units and switches that monitor the systems in which they are installed. These sending units and switches transmit signals to indicators and warning lights in the operator’s cab, allowing the operator to monitor the system and warn him of impending problems. 1-20

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