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 (3) Replace broken or worn parts.
Replace
armature and field coils that fail electrical test. Replace
flanges. Remove all burrs. Replace a defective manifold.
armature assembly if shaft is bent, or scores are deep.
(3) Check threads on mounting studs. Replace
defective studs. Drive new studs to a torque of 25-40 ft lbs.
e. Reassembly. Assemble by reversing the procedure
of disassembly in c. above.
the exhaust manifold.
the generator.
connected to the flexible elbow and runs up to the smoke
g. Test and Adjustment.
stack where it is connected to the muffler. The flexible pipe is
(1) Remove band at end of generator.
insulated for safety, and is clamped in place throughout its run
(2) Inspect the commutator for sparking,
to the stack.
discolored, or dirty condition.
(1) Remove the exhaust pipe when necessary, by
(3) Remove brushes as described in step (5)
disconnecting at elbow of exhaust manifold: remove holding
below. then hold a piece of 00 sandpaper against the
clamps, and disconnect from the muffler.
commutator with a flat piece of wood, while the generator is
(2) Remove muffler by disconnecting the exhaust
turning at normal speed. Remove sand and dirt with clean,
pipe, and removing the mounting hardware.
dry, low pressure air (10 psi).
(3) Install either by reversing the removal
(4) Inspect brushes. Brushes should slide freely
procedure.
in brush holders. Replace oil-soaked or worn brushes.
(5) To remove brushes, raise brush spring from
brushes, and lift brushes from brush holders. Disconnect
5-24.
Engine Generator
flexible pigtails from brush rigging.
a. General. The battery charging generator is a 24 vdc,
(6) New brushes must be seated to the
400-watt generator, belt driven from the crankshaft pulley.
commutator to insure proper electrical connection between the
This generator maintains the starting batteries at a full charge.
armature and the external circuit. Brushes may be seated by
installing in brush holders and running in. Better seating will
the generator.
be obtained by "sanding in" the brushes. To "sand in"
c. Disassembly.
brushes, wrap a piece of 00 sandpaper, cut to commutator
(1) Remove brush cover band from around end of
width, around the commutator in the opposite direction to that
generator. Lift tension springs from brushes. Slip brushes
of normal rotation. Install brushes in brush holder. Set spring
out of brush holders.
tension. Rotate the armature by hand in normal direction until
(2) Disconnect brush flexible leads and field coil
the brush faces fit contour of commutator. Carefully clean
connections from brush rigging.
dust and sand from commutator ((3.) above).
(3) Remove coupling from drive end of generator.
(7) Replace band on generator.
Remove endbell from driven end. Remove drive end bearing
assembly and generator fan.
5-25.
Voltage Regulator
(4) Remove mounting screws from commutator
a. General. This voltage regulator directs the flow of
endbell. Withdraw commutator endbell and armature from
current from the generator (para 5-24) to the batteries at the
generator.
predetermined rate, until the batteries are fully charged, then
(5) Remove bearing from commutator endbell.
reduces (or limits) flow until the load calls for an increase.
Pull endbell from armature.
(6) Remove brush rigging.
the voltage regulator.
(7) Clamp generator housing in vise. Remove
pole pieces and field coils by withdrawing mounting screws
c. Inspection and Test. The following quick checks can
from generator housing.
be made to determine whether or not the units in the electrical
(8) Press pole pieces from field coils.
system are operating properly. If not, the checks will indicate
whether the generator or regulator is at fault, whereupon
d. Cleaning, Inspection, and Repair.
proper corrective measures may be taken. A fully charged
(1) Clean all components with a solvent
battery and a low charging rate on ammeter indicates normal
conforming to FED SPEC P-D-680.
voltage regulator operation. To check the current regulator,
(2) Inspect all components for broken or worn
proceed as follows:
parts. Test armature and field coils for shorts, opens, or
(1) Move engine throttle to NO FUEL position,
grounding. Use a growler or other suitable test equipment
then operate the motor starter about 15 seconds.
(TM 55-506). Replace ball bearings. Inspect armature for
bent shaft or damaged commutator.
5-76
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