C1, TM 9-1240-318-35
with screw (3) after test and adjustment below has been
d. Cleaning.
completed.
(1) Clean all lenses thoroughly using the
(4) Install cap assembly (2) into groove on
materials specified in TM 9-254.
objective end of telescope.
(2) Remove all traces of sealing compound from
(5) Install eyeshield (1) in place on eyepiece
interior of cell with cleaning solvent 6850-336-8170.
end of telescope.
e. Assembly.
f. Test and Adjustment.
(1) Since the presence of a film of grease
reduces adhesion all interior surfaces of the cell and its
(1) Eyepiece focus.
components must be thoroughly cleaned before
(a) Use dioptometer 4931-536-5557 and
assembling and sealing.
adjust eyepiece until the dioptometer reticle is sharp to
(2) Assemble items 4 through 2 and install in
the observers eye. Set the objective tube of dioptometer
cell (5). Install and secure retainer (1) using tubular
between -0.75 to 1.0 diopter.
spanner wrench.
(b) Place dioptometer against the eyepiece
of telescope. Sight through dioptometer and observe if
f. Sealing. Using hydraulic guns 4931-764-8134,
the reticle pattern of telescope is at its sharpest focus; if
inject sealing compound, MIL-S-11031, into the two
not, rotate eyepiece clockwise or counterclockwise until
injection ports of cell (5), and add a small amount of
this requirement is attained.
sealing compound around the outer edge of retainer (1),
(c) Secure eyepiece cell assembly with
thereby locking the ring in place.
screw (3) and lock with varnish, MIL-V-173.
Note. Use care when using sealing compound
5-7.
Disassembly of Cell Assembly 1240-891-1289
on retainer so as not to get any compound on the
lenses.
Note. Item numbers shown below refer to figure
5-8.
Replacement of Cell Assembly 1240-891-1287
and Gasket 1240-891-4539
a. Removal.
(1) Using tubular spanner wrench, 4931-580-
Note. Item numbers shown below refer to figure
0012 unscrew retainer (1).
(2) Remove items 2 through 4 from cell (5).
a. Removal.
Note.
Use care in removing retainer and
(1) Remove two screws (1) securing objective
eyelenses since they are sealed with sealing
cell assembly (2). Remove cell assembly using tubular
compound, adhesive curing, MIL-S-11031, 8030-275-
spanner wrench.
8110.
(2) Remove gasket (3).
b. Inspection.
b. Inspection.
(1) Inspect retainer for damaged threads.
(1) Inspect the cell for dents or damaged
(2) Check lenses for chips, digs, or scratches.
threads.
(3) Check fluoride coating for excessive
(2) Check exterior optics for loss of coating,
scratches, or digs.
(4) Inspect the cell for dents, damaged threads,
(3) Inspect gasket for breaks, damage, or
scratches and bare spots that may lead to corrosion.
c. Repair.
c. Installation.
(1) Remove small chips or fractures on lenses
(1) Install gasket in place on interior of
that will interfere with performance by using a fine
telescope tube.
abrasive stone.
(2) Clean exterior optics and screw cell
(2) Touchup cell, as required, using olive drab
assembly in telescope tube.
paint, 8010-598-5936.
(3) Objective cell assembly will be secured after
test and adjustment below has been completed.
5-2