b. Cleaning, Inspection and Repair.
where batteries remain charged but do not overheat or
(1) Clean all metal parts with an approved
use excessive amounts of water.
c. Removal. Refer to TM 5-3810-232-12.
cleaning solvent and dry thoroughly.
d. Disassembly and Testing.
(2) Remove all dirt, dust, and foreign matter
from the frame and fields with compressed air.
(3) Inspect all parts for excessive wear or
guard washer (59) and remove pulley with a suitable
other damage. Repair or replace all defective parts.
(4) Refer to TM 5-764 for armature and field
When removing pulley nut, secure
c. Reassembly and Installation.
pulley in a vise or suitable clamp to
prevent rotation of the shaft. Do not
reassemble the generator and mounting parts as
attempt to hold the rotor shaft by
placing. screwdrivers or bars in the
(2) Installation. Refer to TM 5-3810-232-12.
fan, as damage will result. When the
pulley has been removed, the
a. Removal and Disassembly.
woodruff key and pulley spacer (58)
(1) Removal. Refer to TM 5-3810-232-12.
may now be removed.
disassemble the alternator as illustrated.
(2) Remove the six socket head screws (60)
b. Electrical Test of the Vehicle.
which retain the drive end housing (52) and using a
puller, remove the drive end housing and regulator
expose the "G" plus and "G" minus terminals and check
the voltage across these terminals.
(3) The voltage regulator may be removed
disconnect switch on. Full battery voltage should be
from the drive end housing by removing the four socket
present. If no voltage is present across the "G" plus and
'G" minus terminals, an open circuit between the
alternator and battery is indicated. This may be due to
The regulator also serves as a
loose or broken wiring or possibly a defective
bearing retainer and must be
circuitbreaker, master switch or ammeter. Turn on the
removed when replacing the drive
main switch and check for battery voltage between
end bearing (48).
ground and the alternator ignition terminal. Correct any
defects before proceeding to the next test. Full battery
(4) Press the bearing from the drive end
voltage must be present at the alternator positive
terminal as well as the alternator ignition terminal when
the main switch is turned on.
When pressing the bearing out of the housing, force
should be applied to the outer race to avoid the
plus and "G" minus alternator terminals. The engine
possibility of brinneling the bearing.
should now be started and run at a speed which will
maintain approximately 2,000 alternator RPM. Electrical
(5) Remove the two round head screws and
accessories should now be turned on until the alternator
guard washers which secure the brush holder (39) and
output is approximately 10 amps. At this point, the
lift the brush holder out of the way. Remove the brushes
voltage should be 28.0. If the voltage is above or below
(42) by pulling them out of the holder.
this reading it should be readjusted by removing the pipe
(6) Remove the socket head screw (1) and
plug from the top of the drive end housing and turning
washer (2) which retain the fan (5) and pull the fan off of
the voltage adjusting screw with a small screwdriver.
the rotor shaft. Remove the key (4) from the shaft.
Increase voltage by turning the screw counterclockwise
(7) Remove the six socket head screws (8)
and decrease voltage by turning screw clockwise. Be
which secure the anti drive end housing (9) and pull the
sure to replace the plug after adjustments have been
housing and rotor assembly (13) out of the stator (12)
made to keep out the dirt and moisture. When vehicles
and intermediate housing assembly (29).
are operated in locations where extremely high
(8) Pull the housing off of the rotor shaft,
temperatures are encountered, it may be necessary to
using a suitable puller.
reduce the voltage to prevent battery damage. Under
these conditions voltage should be reduced to a point