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 TM 55-1925-204-12
(2) Move throttle to about half speed, then start
5-26. Starting Motor
the engine. With engine running at medium speed, quickly
note reading of the ammeter. This reading should be the
NOTE
normal output value for which the current regulator is set.
Some vessels may be equipped with
(3) Allow the engine to continue running and, as
engine hydrostarters. If so equipped,
soon as the generator has restored the battery power
refer to TM 55 2990-201-12.
consumed in cranking, the voltage regulator (if operating
normally) will decrease the output until ammeter shows
a. General. The starting motor currently in use on this
pointer at zero, or barely past zero on the charge side.
equipment has a spray type overrunning clutch drive. When
(4) A fully charged battery and a high charging
the starter push switch completes the electrical circuit, a
rate indicates that the voltage regulator is not reducing the
solenoid is energized and shifts the starting motor pinion into
generator output as it should.
Proceed as follows to
mesh with the teeth of the flywheel ring gear and closes the
determine the cause:
main contacts within the solenoid. Once engaged, the clutch
(a) Disconnect the field "F" terminal lead from
will not disengage during intermittent engine firing. To protect
the regulator. This opens the generator field circuit and the
the armature from excessive speed when the engine does
output should normally drop to zero.
start, the clutch overruns, or turns faster than the armature,
(b) If the output drops to zero with the "F"
which permits the pinion to disengage itself from the tring
terminal lead disconnected, the trouble has been isolated to
gear.
the regulator.
(c) Reconnect the "F" terminal lead, remove the
the starting motor.
regulator cover, and depress the voltage regulator armature
c. Disassembly.
manually to open the points.
(1) Raise brush spring (7, fig. 5-59) Lift brushes
(d) If the output now drops off, the voltage
(6) in holders (8) and wedge in raised position with brush
regulator unit has been failing to reduce the output as the
springs.
battery came up to full charge.
(5) Replace a defective voltage regulator.
KEY to fig. 5-59:
1.
Solenoid
10.
Leads, electrical
the voltage regulator.
2.
Drive assembly
11.
Screw & lockwasher
3.
Field winding L.H.
12.
Bearing sleeve, intermediate
4.
Field winding R.H.
13.
Bearing sleeve, drive end
5.
Armature
14.
Housing
7.
Spring
15.
Endbell
8.
Holder assembly
16.
Bearing sleeve, commutator end
9.
Thrust washer
5-77
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