Electrical maintenance checks
RESTRICTED
d.
Gears,
Sight.
Fig.
FIg.
SPECIFIC
UNITS
Fifty
Hour In-
spection
(Cont 'd)
1. Teles-
cope
Motor
Fig. 48
Fig. 49
4.
sistance is obtained points
are dirty.
B.S., telescope light and
telescope motor "on"
• Con-
tact poles #15 and #13.
4 ohms
1. Check all gears for burrs,
and
remove the burrs with
a knife-edge Arkansas Stone.
2.
Clean all
gear teeth with
an
orange stick or brush and
benzine, or other suitable
solvent. If brush and sol-
vent is used, dirt and so!-
vent should be caught on a
cloth held next to the gear
being cleaned so that other
parts will not be affected.
1. Cleaning.
A.
If governor pivots are binding, clean with
kerosene or benzine.
B.
Clean bearings using the following clean-
ing solutions.
Tectyl.
2.
3.
No Fome.
L. and R. Rinse.
When using the
above use in order
given.
above solutions are
not
available use
4. Benzine
5.
Acid -free kerosine.
6. Alcohol.
CAUTION: Never spin a bearing that is dirty, as
the balls and races wiil be damaged.
A clean bear-
ing
will
turn freely.
After cleaning, dry the
bearing and then inspect with a loupe. Be sure to
oil
Remove dust and dirt from case with alco-
moistened cotton swab. Also clean
all bright
metal with
either alcohol or carbon tet., and wipe
with clean white cloth.
D. Clean the commutator with carbon tet.,
and wipe with clean white dry cloth.
E.
the brushes and brush tubes with
alcohol or carbon
tet.
2.
Oiling.
a.
If the armature shaft bearings are
removed and washed, oil with one drop
of light bombsight
oil.
DO NOT OVEROIL.
1.
If
the
the
bearing
after
cleaning.
C.
hol
off
Clean
149