C 3, TM 9-1290-335-35
the micrometer pointer making one complete revolution
3-8. Performance Test
while the directional pointer and the azimuth pointer
move one graduation.
a.
With the resetter knob in its normal (up)
e.
To test backlash of the azimuth indicator,
position, turn it in either direction. The micrometer
traverse the turret and evelate or depress the gun until
pointer should turn without movement of the azimuth
the vertical line of the telescope or gunner's periscope
pointer.
reticle is laid on a well defined vertical aiming point.
b.
Depress the resetter knob and turn it in
Position the 0 (zero) on the gunner's aid dial in line with
either direction. Both the azimuth pointer and the
the micrometer pointer.
Traverse the turret
micrometer pointer must turn in unison. The knob w: ill
approximately
50
mils
clockwise,
and
then
spring back from its depressed position when released.
counterclockwise to the original aiming point without
c.
Turn the gunner's aid dial to see that it is
overtravel. The backlash error shall not exceed 0.5 mil.
free and that the flat spring holds it in position.
Repeat this procedure by traversing counterclockwise
d.
Traverse the turret to see that the gears are
and returning clockwise.
operating freely and the pointers turn correctly. All three
pointers should move when the gun is traversed, with
Section III. INSPECTION IN DIRECT SUPPORT AND GENERAL
SUPPORT MAINTENANCE SHOPS AND AT DEPOTS
b. Rotate the drive gear until the directional
3-9. General
pointer is set to 0 (zero). Depress the resetter knob and
This section sets forth the procedure to be followed by
set the micrometer and azimuth pointers to 0 (zero).
direct support, general support, and by depot
Scribe reference marks on the drive gear and bottom
maintenance personnel in performing inspection of the
housing. Rotate the drive gear 360 degrees (6400 mils)
azimuth indicator when removed from the ARAAV M551
aligning the scribe marks without overtravel. The three
and turned to the shop for repair.
pointers should rest at original 0 (zero)'setting.
c. To test backlash rotate the drive gear to aline
3-10. General Inspection Requirements
the scribe marks, position the 0 (zero) on the gunner's
Refer to paragraphs 3-3 through 3-8.
aid dial in line with the micrometer pointer. Rotate the
drive gear approximately 50 mils clockwise, and then
3-11. Performance Test
counterclockwise to aline the scribe marks without over
a.
Refer to paragraph 3-8a through 3-8c and
travel. The micrometer pointer will indicate 0 (zero)
perform the test cited.
within 0.5 mil, as read on the gunner's aid dial. Repeat
this
procedure
by
rotating
the
drive
gear
Note
counterclockwise and returning to aline scribe marks
Clamp lower housing of a complete
clockwise.
azimuth indicator upright in a vise,
so the drive gear can be rotated.
3-2
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