C1, TM 9-1240-318-35
eyepiece, rotate cell assembly a small amount until the
e. Assembly.
above conditions are attained.
(1) Since the presence of a film of grease
(3) Place a small amount of sealing compound,
reduces adhesion, the cell and its components must be
MIL-S-11031, on the threads of screws (2) and lock cell
thoroughly cleaned before assembling and sealing.
assembly in place.
(2) Assemble items 7 through 2 into cell (8, fig.
(4) Check parallax test and adjustment in
S-11031, on threads of retainer (1, fig. 7 located in
5-11. Disassembly of Cell Assembly 1240-891-1288
spanner wrench.
M120 only) or Cell Assembly 1240-483-1171
(XM134 only).
Note. Item numbers shown below refer to figure
6, located in appendix B.
Note. Item numbers shown below refer to figure
(3) Install reticle (4) in cell (6) etching towards
the objective and position reticle so that the vertical
a. Removal.
etched lines and the horizontal 800 meter line straddle
(1) Remove retainer (1) using tubular spanner
the illumination hole of the cell.
wrench.
(4) Install items 3 and 2 and secure with
retainer (1) using tubular spanner wrench.
Note. Use care in removing components of cell
(5) Place a small amount of sealing com pound,
and cell assembly since they are sealed with sealing
MIL-S-11031, on the threads of cell assembly (5) and
compound, MIL-S-11031.
install cell assembly into cell (6).
(2) Remove items 2 and 3 from cell (6).
f. Sealing.
(3) Prior to removal of reticle (4) note position of
(1) Using sealing compound gun inject sealing
the reticle in relation to the illumination slot of cell (6).
compound, MIL-S-11031, into the sealing ports of cell (6)
Remove reticle from cell.
thereby locking the reticle (4) and cell assembly (5) in
(4) Remove cell assembly (5) using tubular
place.
spanner wrench.
(2) Lock retainer (1) in place by placing a small
(5) Using tubular spanner wrench remove
amount of sealing compound around its outer edge.
retainer (1, fig. 7, located in appendix B).
(6) Remove items 2 through 7 from cell (8, fig. 7
Note. The test and adjustment below will have to
located in appendix B).
be performed immediately so that cell assembly (5)
can be rotated within cell (6) before the sealing
b. Inspection.
compound is cured. In order to complete the test
(1) Inspect retainers for damaged threads.
and adjustment below, the telescope must be
(2) Check lens for chips, digs, or scratches.
completely assembled.
(3) Check that the lines of reticle pattern are
sharp, distinct, and numbers legible.
g. Test and Adjustment of Reticle Accuracy.
(4) Check fluoride coating for excessive
(1) With the fixture setup as outlined in
(5) Inspect the cells for dents or damaged
assembled, place telescope in the dovetail of mount and
threads.
secure in place.
(2) Prior to checking for reticle accuracy, check
parallax test and adjustment in paragraph 5-8 d.
lenses that will interfere with performance by using a fine
(3) Sight through the telescope and observe if
abrasive stone.
the angular value between the boresight cross and the
2000 meter range line of the telescope reticle is 18.6
d. Cleaning.
mils, 0.6 mil for telescope M120 or 36.95 mils +0.6 mil
(1) Clean all lens thoroughly using the materials
for telescope XM134 when checked against the fixture
specified in TM 9-254.
collimator reticle pattern.
(2) Remove all traces of sealing compound from
(4) If the reticle accuracy is under or over the
cells and retaining rings with cleaning solvent, 6850-336-
tolerance specified in (3) above, remove the eyepiece
8170.
assembly and insert a tubular spanner
5-4
