Conventional Type
GENERAL DESCRIPTIONCRANKING CIRCUIT
The cranking circuit consists of the battery, starting motor, ignition switch, and related electrical wiring. These components are connected electrically as shown in figure below. Only the starting motor will be covered in this section.
STARTING MOTOR
Both of them consist of yoke assembly,armature assembly,overrunning clutch assembly, magnetic switch assembly,drive end frame (housing), rear end frame (commutator end housing),brush holder and drive lever.
In the circuit shown in figure below,the magnetic switch coils are magnetized when the ignition switch is closed.The resulting plunger and pinion drive lever movement causes the pinion to engage the engine flywheel gear and the magnetic switch main contacts to close,and cranking takes place.When the engine starts, the pinion overrunning clutch protects the armature from excessive speed until the switch is opened, at which time the return spring causes the pinion to disengage.