TM 5-6115-400-35
i. installation. Refer to TM 5-61140012.
(3) Place the armature ends in V blocks and
33. Generator Regulator
measure the commutator for out-of-round
with a dial indicator. Turn down if in
a. General. The generator regulator (fig.11) is a
excess of 0.001-inch out-of-round.
watertight, fungus and corrosion resistant unit for
(4) Inspect end frames for cracks and
military applications. It is a heavy-duty, 24-volt, 18-
damaged or worn bearing surfaces.
ampere unit, designed for use in a negative grounded
(5) Inspect brush plate for cracks and loose
system and for generators having an internally grounded
rivets. Inspect insulated brush holders for
field circuit. Terminals of the regulator are housed in
grounds.
special
conforming
to
Ordnance
specifications. Connections to the regulator are made
(6) Inspect brush springs for tension and
by means of mating Ordnance-type receptacles on the
signs of breaks or other damage.
vehicle wiring harness.
Replace brushes.
b. Removal. Refer to TM 5-6115400-12.
(7) Inspect the ball bearings for smooth
operation. Inspect for excessive side play
c. Regulator maintenance.
and damaged surfaces.
(1) Test specifications for regulator Model
(8) Inspect the generator field frame for
111 8644 are as follows.
breaks, cracks, and damaged threads.
VOLTAGE REGULATOR
(9) Inspect all hardware for damaged threads.
Air Gap (inches) ................................... .087
Satisfactory Operating Range
(volts) ................................................... 27.6-29.5*
g. Testing.
If outside range, adjust to (volts) .......... 28.2*
(1) Test for windings grounded to core with a
CURRENT REGULATOR
continuity tester. Touch one probe of the
Air Gap (inches) ................................... .087
tester to the armature shaft and the other
Satisfactory Operating Range
to each commutator riser. An indication
(amp.) .................................................. 16-20*
of continuity indicates the armature is
If outside range, adjust to (amp.) .......... 18*
grounded.
CUTOUT RELAY
(2) Check for open windings with a test lamp.
Air Gap (inches) ................................... 048
Touch the probes to a pair of adjacent
Point Opening (inches) ......................... .035
commutator risers. Failure of the lamp to
Satisfactory Closing Range (volts) ........ 25-27*
light indicates an open winding.
If outside range, adjust to (volts) ........... 26*
(3) Inspect for shorts with a growler and steel
RESISTOR VALUES (OHMS)
strip. The steel strip will vibrate against
A .......................................................... 200 (2)
the armature over a shorted area as the
B -. ........................................................ 750 (2)
armature is turned.
C .......................................................... 600 (1)
(4) Inspect the field windings for worn or
D .......................................................... 800 (2)
frayed insulation, defective connections,
E .......................................................... 80 (1)
opens, and field current draw.
*THESE VALUES APPLY ONLY WHEN
(5) Replace or repair all defective parts as
THE REGULATOR IS BEING TESTED
necessary.
AT OPERATING TEMPERATURE, ON
THE VEHICLE, AND IN ACCORDANCE
h. Assembly.
Reassemble generator in direct
WITH THE PROCEDURE DESCRIBED
reversal of disassembly. Seat brushes using a seating
IN THE FOLLOWING SECTION.
hone or sandpaper wrapped around commutator. Clean
commutator thoroughly and complete assembly.
(2) Mechanical checks and adjustments (air
gaps, point openings) must be made with
the battery disconnected and the regulator
preferably off the vehicle.
32
