Service Manual

Part Numbers
71-6040, NN10889, 62-2710, 79-6570
Purpose
The starter motor pushes the starter pinion into engagement with the
flywheel, then rotates the starter motor to start the engine.
How It Works
The starter motor is really just a collection of simple parts:
FIELD: A coil of wire on an iron core that becomes an electromagnet when
current is applied. It surrounds the armature.
ARMATURE: Eight coils of wire on an iron core that become
electromagnets when current is applied. The end of each coil is
connected to a section of the commutator. The armature rotates.
COMMUTATOR: The commutator is the connection point between the
brushes and the coils in the armature. The sections are divided such that
only one armature coil is “on” at a time. This sets the armature to rotating
because the electromagnetic field in the field coil will oppose the one in the
armature.
BRUSHES: Supply power to the commutator.
Starter
Electric
Glossary
GLOSSARY
Demystification Guide 3-19