STARTER MOTOR

TM 5-2410-237-23

ELECTRICAL SYSTEM THEORY OF OPERATION - CONTINUED

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STARTER MOTOR

The starter motor is used to turn the engine flywheel fast enough to get the engine running.

The starter motor has a solenoid (7). When the start switch is activated, electricity from the electrical system will cause

the solenoid (7) to move the starter pinion (8) to engage with the ring gear on the flywheel of the engine. The starter pin-

ion (8) will engage with the ring gear before the electric contacts in the solenoid (7) close the circuit between the battery

and the starter motor. When the start switch is released, the starter pinion (8) will move away from the ring gear of the

flywheel.

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SOLENOID

A solenoid is a magnetic switch that uses low current to close a high current circuit. The solenoid has an electromagnet

with a core which moves.

There are contacts (9) on the end of core (10). The contacts (9) are held in the open position by spring (11) that pushes

core (10) from the magnetic center of coil (12). Low current will energize coil (12) and make a magnetic field. The mag-

netic field pulls core (10) to the center coil (12) and the contacts (9) close, completing the circuit between the battery ter-

minal (13) and starter terminal (14).

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END OF WORK PACKAGE

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