tool prevents the slip rings from catching on the edge of
With the alternator running at a speed of 2.000 RP,
the seal and damaging the sealing lips.
adjust the voltage by removing the pipe plug from the
(5) Install socket head bolts which retain anti
end housing and turning the adjusting screw with a small
drive end housing to the stator and intermediate housing.
screwdriver. The screw should be turned clockwise to
(6) Install brushes in brush holder and install
reduce voltage and counterclockwise to increase
brush holder with the two screws that were originally
voltage. Voltage should be adjusted to 27.5 to 28.0.
removed.
After the has been adjusted, apply a sixty ampere load.
(7) Install new bearings in drive end housing
Alternator output should be 55 to 60 amps.
and install voltage regulator with four socket head
screws.
(8) Install spacer or seals0 on rotor shaft in
reverse order as removed.
(9) Press regulator and housing on rotor
shaft.
CAUTION
The six prong plug on the regulator
must line up its male in the alternator.
Use several long screws to properly
pilot the housing while pressing it on.
Be sure the rubber O-ring (45 fig. 3-2)
is in place on the drive end housing.
(10) Replace the six socket head screws which
retain the drive end housing. Install key and fan using
socket head screw and retaining washer. Install the
pulley spacer, woodruff key, and pulley. Install the guard
washer and pulley nut, torquing to 50 ft.-lbs. When
Figure 3-6. Bench test wiring diagram (Model 2385).
possible use a new pulley nut as its self-locking ability is
reduced lifter the nut has been removed.
k. Installation. Refer to TM 5-3810-232-12.
j. Bench Testing Complete Unit. The unit may now
be checked on a test clock and the voltage properly
adjusted. Connect the alternator as shown in figure 3-6.
Section II. CARRIER ENGINE GENERATOR REGULATOR
must be shut off when making adjustments. All checks
3-4. General
must be made with the regulator at operating
The voltage regulator prevents line voltage from
temperature and connected to the same type of DC
exceeding a predetermined valve and thus protects
generator as is used on the engine.
battery and other electrical units in system from high
voltage.
Replace the cover after each adjustment, and operate
3-5. Removal
the generator until the regulator returns to its normal
a. Disconnect batteries before removing regulator.
operating temperature. In performing the regulator test,
b. Disconnect the electrical leads at the couplings
the DC generator should be turned at 3500 to 4000
of the voltage regulator. Tape the ends of the cables to
RPM. In the event voltage and amperage continue to
avoid short circuiting.
rise without control from the regulator, it is an indication
c. Remove the four bolts and lockwashers that
that the voltage regulator is defective.
secure the voltage regulator and brackets to the carrier;
remote the assembled voltage regulator and bracket.
CAUTION
3-6. Testing and Adjusting
a. Remove the four screws and lockwashers and
Air gap and point gap opening are
the two seal cups that secure the cover the regulator
checked
with
the
battery
base assembly; remove the cover.
disconnected.
NOTE
The generator regulator must be in operating position
when being adjusted or tested. Power to the regulator
3-10
