5-01
Starting System
5-01
Part 5 Starting System
COMPONENT INDEX
Page
COMPONENT INDEX
Page
DESCRIPTION AND OPERATION......
Disassembly.........................................
TESTING
Cleaning and Inspection ......................
Booster Battery ..............................
Assembly .............................................
On-Vehicle Testing ........................
Starter Drive Replacement ..................
Bench Tests ...................................
Brush Replacement ............................
REMOVAL AND INSTALLATION ........
Armature Replacement ........................
OVERHAUL .........................................
Starter Terminal ...................................
remote control starter switch, the starter relay, and heavy
DESCRIPTION AND OPERATION
circuit wiring.
The function of the starting system is to crank
Turning the ignition key to the START position or
the engine at a speed fast enough to permit the engine
pressing the start button actuates the starter relay
to start. Heavy cables, connectors, and switches are
through the starter control circuit. The starter relay then
used in the starting system because of the large current
connects the battery to the starter. When the starter is
required by the starter while it is cranking the engine.
not in use, one of the field coils is connected directly to
The amount of resistance in the starting circuit must be
ground through a set of contacts (Figure 1). When the
kept to an absolute minimum to provide maximum
starter is first connected to the battery, a large current
current for starter operation.
Loose or corroded
flows through the grounded field coil, actuating a
connections, relay contacts. or partially broken cables
movable pole shoe. The pole shoe is attached to the
will result in slower than normal cranking speeds, and
starter drive plunger lever and thus the drive is forced
may even prevent the starter from cranking the engine.
into engagement with the flywheel.
When the movable pole shoe is fully seated, it
POSITIVE ENGAGEMENT STARTER
opens the field coil grounding contacts and the starter is
The starter used on these engines is the positive
then in normal operation. A holding coil is used to
engagement starter. The starting system includes the
maintain the movable pole shoe in the fully seated
starter motor with an integral positive-engagement drive,
position during the time that the starter is turning the
the battery, a
engine.
FIG. 1. Starting Circuit Positive Engagement
