OTHER COMPONENTS

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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ELECTRICAL SYSTEM SYSTEMS OPERATION TM 5-3805-263-14&P-2 tact across the battery and motor terminals of the solenoid, and the starter motor begins to turn the flywheel of the engine. When the start switch is opened, current no longer flows through the windings. The spring now pushes the plunger back to the original position, and, at the same time, moves the pinion gear away from the flywheel. When two sets of windings in the solenoid are used, they are called the hold-in winding and the pull-in winding. Both have the same number of turns around the cylinder, but the pull-in winding uses a larger diameter wire to produce a greater magnetic field. When the start switch is closed. part of the current flows from the battery through the hold-in winding, and the rest flows through the pull-in windings to motor terminal. then through the motor to ground. When the solenoid is fully activated (connection across battery and motor terminal is complete), cur- rent is shut off through the pull-in windings. Now only the smaller hold-in windings are in operation for the extended period of time it takes to start the engine. The solenoid will now take less current from the battery. and heat made by the solenoid will be kept at an acceptable level. Magnetic Switch A magnetic switch (relay) is used for the starter solenoid circuit. Its operation electrically, is the same as the solenoid. Its function is to reduce the low current load on the start switch and control low current to the starter solenoid. OTHER COMPONENTS Circuit Breaker The circuit breaker is a safety, switch that opens the battery circuit if the current in the electrical system goes higher than the rating of the circuit breaker. A heat activated metal disc with a contact point completes the electric circuit through the circuit breaker. If the current in the electrical system gets too high. it causes the metal disc to get hot. This heat causes a distortion of the metal disc which opens the contacts and breaks the circuit. A circuit breaker that is open can be reset (an adjustment to make the circuit complete again) after it becomes cool. Push the reset button to close the contacts and reset the circuit breaker. 1-23

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