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 (6) Inspect motor windings for damaged insulation.
and remove belt. Remove bolts and nuts holding motor
Replace motor assembly if windings are defective.
mounting and remove motor.
(7) Inspect commutator for roughness or pitting.
d. Disassembly.
Smooth with sandpaper. If commutator requires turning in a
(1) Remove pulley from rotor shaft.
lathe report to higher maintenance level.
(2) Remove screws holding commutator end-bell to
f. Assembly.
motor frame, and pull endbell and brush holder from shaft.
(1) To assemble, reverse order of disassembly.
(3) Remove screws securing drive endbell to motor
(2) Pack new bearings with grease in accordance
frame, and remove drive endbell and armature assembly.
with LO 56-1925-204-12.
(4) Remove brush holder from commutator endbell;
(3) Sand new brushes to contour of commutator.
mark position for reassembly.
Blow out carbon dust. Adjust brush tension (TM 55-506).
(5) Pull drive endbell from armature shaft.
(4) After motor is assembled, rotate by hand to
(6) If bearings are to be replaced, bend tabs on
determine that armature and shaft are free.
lockwashers back and remove bearing locknuts and
lockwashers from armature shaft.
g. Installation.
(7) Pull bearings from armature shaft using bearing
(1) Position motor on mounting and secure.
puller (TM 55-506).
(2) Install belt and tighten belt adjusting nut.
e. Cleaning and Inspection.
NOTE
(1) Blow accumulation of carbon dust and dirt from
Do not overtighten belt.
Tighten only
motor windings with dry, low-pressure (10 psi) compressed air.
enough to eliminate slippage between belt
(2) Wipe all parts with a lint free cloth moistened
and pulley.
with cleaning solvent conforming to FED SPEC P-D-680.
(3) Inspect bearings for roughness in rotation;
5-54.
Rotary Hand Pumps
replace defective bearings.
a. General. Three rotary hand pumps are installed in the
CAUTION
tug - One in the lubricating oil system (fig. 5-95), one in the fuel
When inspecting bearings, rotate by hand,
oil system, and one in the bilge and ballast system. The pump
do not spin with compressed air.
in the lubricating oil system is used for pumping out the sludge
(4) Inspect brushes for chipping and wear. Replace
tank contents. The pump in the fuel oil system is used to
defective brushes (TM-506).
replenish the fuel oil day tanks, should the fuel transfer pump be
(5) Inspect brush holders. Replace defective brush
out of service. The third pump is installed in the anchor locker
holders.
to pump out bilge. Their capacity is 10 gpm.
5-130
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