TM 5-4240-501-14&P
STARTERS
Gear Drive 12V & 120V
GEAR DRIVE STARTER MOTOR
USED ON MODEL 130000
This starting system incorporates a permanent magnet
motor and back gearing. A gear type engagement
method similar to an automobile starter is used. When
the starter motor is activated, the helix on the back gear
shaft drives a pinion gear into engagement with a ring
gear attached to the engine flywheel and cranks the
engine.
Fig. 67 - Typical Starter Motors
A LIST IS GIVEN TO AID YOU IN DIAGNOSING
PROBLEMS FOR 12 VOLT AND 120 VOLT SYSTEMS.
SEE PAGE 9.
The service procedures for both the 12 volt and 120 volt
starter motors are similar and will be covered together
except where noted otherwise.
The 120 volt electric starter is equipped with a three-
prong plug for safety. The longer prong in this plug is
connected to the starter motor housing. When the
starter motor is plugged into the three-wire cord supplied,
and the cord is plugged into a properly grounded
receptacle, it will protect the user from shock should the
starter-motor insulation fail for any reason. If a longer
extension cord is used with this starter, it should also
have three-prong and three-hole plugs. Fig. 68.
CAUTION: 120 volt starter motor should be Hi- Pot
tested before reassembly to engine to determine if a
shock hazard exists.
Fig. 68 - 120 Volt Gear Drive Starter
CAUTION: DO NOT run starter motor for more
than one minute without cooling 15 minutes.
A 12 ampere hour battery is suggested for warm
temperature operation and a 24 ampere hour
battery should be used in cold service. See page
17.
Fig. 69 - 12V & 120V Starter Motor, Exploded View
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