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TM 55-2915-335-30&P
2-18. ARMATURE AND FIELD TUBE ASSEMBLY - lNSPECT/REPLACE (Cont)
2-18
k. TI INSPECT. Visually inspect that brush leads are positioned in holders properly. Check that springs are rest-
ing in brush and holder slots and brushes are positioned against commutator. Make sure that impeller turns
armature and that both thrust washers are in place.
6. INSTALL FIELD TUBE ASSEMBLY
a.
b.
c.
d.
e.
f.
Keep armature seated when installing
field tube. Allowing armature to slide out
of brush housing may cause permanent
damage to brushes.
Find the paint mark on the end of one magnet.
This is the “north” field magnet.
Position field tube (3) so that paint mark is up
when field tube is installed on impeller housing (4)
and the north magnet is over the positive brush.
Positive brush (6) is on same side of housing as
impeller opening.
Insert long shaft phillips head screwdriver through
center of field tube (3).
Place tip of long shaft phillips head screwdriver (1)
into hole on end of armature (2) shaft.
Position field tube (3) so that mounting studs (12) will slide between field magnets.
While holding down on armature (2) with phillips screwdriver (1), slide field tube (3) down over armature onto
impeller housing (4). Do not release pressure on armature until field tube (3) is fully positioned on impeller
housing (4).
g. Rotate field tube (3) clockwise. Magnets must rest against mounting studs (12) for proper motor operation. If
using field tube removed previously, check field tube (3) to housing (4) matchmarks. They should be lined up. If
they are on opposite sides, double check the assembly before proceeding.
NOTE
FOLLOW-ON MAINTENANCE: Install cover-end brush holder
assembly (paragraph 2-17).
END OF TASK
2-63
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