TM 5-3805-258-24-1OPERATOR’S STATIONSYSTEMS OPERATIONINDIVIDUAL CIRCUIT DESCRIPTIONThe magnetic fields, from the hold-in windings and from the pull-in wind-ings, add together and start to move the plunger in the cylinder. The shift lever,which is connected to the plunger, starts to move the pinion gear toward the ringgear. The current, that goes through the pull-in windings and the starter motorwindings, makes the motor, and therefore the pinion, start to turn slowly so thatit engages correctly with the ring gear. When the plunger has moved far enoughto engage the pinion with the ring gear, it also makes contact between the switchcontacts and sends much current from the battery to the starter motor to turn itvery fast.With the solenoid switch contacts closed, there is a short across the pull-inwindings and no current goes through them. Only the hold-in windings keep thecontacts closed and the pinion engaged with the ring gear.When the start switch is released, the start solenoid opens and there is nocurrent through the hold-in windings from the start relay. The pull-in windingsare no longer shorted. For a very short time, current is sent from the motorcontacts, through the pull-in windings in a reverse direction and on through thehold-in windings in the normal direction to ground. The magnetic fields madeby the two coils are opposite to each other and are cancelled out. The spring loadon the plunger moves the plunger back to the original position. This moves thepinion away from the ring gear; it also opens the switch contacts so that currentis not sent to the starter motor.3-171
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