TM 5-3810-300-24&P-3
Starting Motor
plugs, or grease cups) should be lubricated periodically
solenoid (Fig. 4) is energized and the solenoid plunger
(refer to Section 15.1).
pulls the pinion into mesh with the flywheel ring gear.
Continued movement of the plunger then closes the
Flywheel Ring Gears
solenoid switch contacts and permits the starting motor
to crank the engine. As soon as the engine starts, the
The starting motor drive pinion and the engine flywheel
pinion is automatically de-meshed by the reversal of
ring gear must be matched to provide positive
torque so the armature will not be subjected to
engagement and to avoid clashing of the gear teeth.
excessive speeds.
Flywheel ring gear teeth have either no-chamfer, a
Bendix chamfer or a Dyer chamfer (Fig. 5).
NOTE: When a current flywheel housing is
installed on an early engine, it may be
Flywheel ring gears with no chamfer are used with
necessary to replace the Dyer drive starting
starting motors equipped with an overrunning clutch
motor with a sprag clutch type motor.
drive. Ring gears with a Bendix chamfer are used with
starting motors equipped with either a Bendix drive or an
overrunning clutch drive. Ring gears with the Dyer
chamfer, used with Dyer drive type starting motors, may
Lubrication
be reversed and used with the overrunning clutch drive
type starting motors.
Starting motors which are provided with lubrication
fittings (hinge cap oilers, oil tubes sealed with pipe
Fig. 5 - Types of Flywheel Ring Gears
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