TM 9-1290-357-15
(6) To prevent excessive damage and wear
d. Preventive Maintenance Checks and Serv-
of threads, never tighten leveling screws, clamp-
ing screws, etc., beyond a snug fit or their capa-
maintenance checks and services which will be
ble limits. The azimuth worm shoe throwout de-
performed at the designated intervals; however,
vice should be used carefully to avoid damaging
these services will also apply to organizational,
the worm.
(7) Any instrument which cannot be ad-
direct support, general support, and depot main-
justed or corrected by the authorized procedure
tenance personnel who may have the occasion to
must be brought to the attention of responsible
use, stow, package or ship the equipment.
personnel.
Internal
M--Monthly
A--After Operation
B--Before Operation
Q--Quarterly
W--Weekly
D--During Operation
Org
Operator
Item
no.
Daily
Reference
Procedure
Item to be
W
inspected
Q
Clean
and
wipe
dry.
1
Aiming
circle
M1,
X
exterior
surface.
Tighten
external
screws
or
nuts.
X
Exposed
mechanical
2
Report
missing
parts.
components.
Traverse
instrument
6400
mils
Azimuth
and
orienting
mechanisms.
in
azimuth
using
orienting
and
azimuth
knobs. Note.
If
there
is
any
binding
or
stick-
ing,
disassembly
and
repair
will
be
required.
Elevate
and
depress
telescope.
Elevation
Note.
If
there
is
any
binding
mechanism.
in
mechanism
as
knob
is
ro-
tated,
or
if
pressure
is
not
exerted
by
the
compression
spring,
disassembly
and
re-
pair
will
be
required.
Point
optics
skyward
or
at
a
Optics.
5
bright
light,
looking
through
the
objective
end
for
dirt,
smears,
fungus
growth,
scratches,
digs,
chips,
or
cement
separations.
Note.
If
defects
are
sufficient
to
interfere
with
the
use
of
the
instru-
ment,
disassembly
and
repair
will
be
required.
Check
accuracy
by
rotating
the
Circular
6
leveled
instrument
slowly
level
vial.
through
a
full
turning
azi-
muth.
The
bubble
should
remain
centered
at
any
position
in
azimuth. Note.
If
bubble
does
not
remain
cent-
ered,
level
vial
should
be
replaced.
Check
simultaneous
readings
of
Azimuth
scale
and
7
scale
and
micrometer
zeros.
Note.
If
does
not
indicate
zero
when
scales
do,
loosen
clamping
screws
or
