Replacement of Ballistic Cover Gasket cont'd

TM 9-1240-369-34

(6) Apply ethyl alcohol, O-C-265, to soften

Seal threads of screws on screw locking assembly ( )

sealant on setscrew. Loosen two setscrews (16) on

with sealant, MIL-S-22473, and tighten.

each shaft and slide two universal joints (17) to the rear

(16) Slip connector A76J3 (12) to the proper

in order to disengage from coupling shaft on optical

opening on the side of main housing assembly (106) and

bench assembly (24).

secure with retaining nut (11). Use connector wrench

(7) Remove two screws (18), two washers

(15, table 2-1) to secure nut.

(19) and two washers (20). Discard screws (18).

(17) Install lockwire (10) from retaining nut (11)

Remove screws with ball wrench (12, table 2-1).

to screw (13) per MS33540.

(8) Remove 6 screws (21), nut (22), and

(18) Lubricate seal around access cover (9) by

seven washers (23). Discard screws (21). Remove

applying a thin, uniform, film of grease, MIL-G-43413, to

screws with ball wrench (12, table 2-1).

the high point on the bead of the seal. Do not apply so

much grease that it fills the grooves on either side of the

bead. Apply by hand.

CAUTION

(19) Install access cover (9) with 10 screws (7)

Use extreme care in performing the

and (10) washers (8).

following step in order to prevent

(20) Perform

receiver-transmitter

unit

damage to the optical bench

alinement procedure as described in paragraph 3-12 c.

assembly.

c. Receiver-Transmitter Unit, Alinement Procedure.

(9) Carefully slide optical bench assembly

(1) Remove balistic cover assembly per

(24) from main housing assembly (106). Use extreme

paragraph 3-12 a.

care to avoid hitting the sides of the housing assembly.

(2) Connect receiver-transmitter unit into hot

Carefully guide harness connector A76J3 (12) during

mock-up as described in paragraph 2-4 except for the

removal.

change shown in figure 3-7; which illustrates the use of

branched cable (1, table 2-3).

CAUTION

(3) Secure alinement lens assembly (4, table

When placing the optical bench

2-3) in front of the receiver-transmitter aperture with four

assembly on a work bench, ensure

screws.

that all optical components are not

(4) Place a sheet of thermal chart paper

damaged. If necessary, place the

(Graphic (Controls Corp., P/N 651-54 or GFE) inches in

assembly on blocks.

front of the alinement lens assembly. The length of the

(10) Make necessary repair on optical bench

cord on the alinement lens assembly is 70 inches.

assembly

(5) Set control knobs on the R/T control unit

to zero.

CAUTION

(6) View chart paper through the receiver-

Use extreme care in performing the

transmitter unit eyepiece and adjust the distance

following step in order to prevent

between the lens assembly and chart paper until no

damage to the optical bench

parallax is apparent between the reticle seen in the

assembly. Ensure cleanliness of all

eyepiece and the image of the chart paper.

optical surface before installing

optical bench assembly into housing

WARNING

(11) Carefully, slide optical bench assembly

The laser ca be dangerous and cause

(24) into main housing assembly (106). Ensure that

blindness if it enters the eyes either

connector A76J3 can be positioned in its proper place

directly or reflected from a shiny

when the optical bench assembly (24) is finally secured

surface. Before pressing the RANGE

to the main housing assembly.

switch (firing the laser), take

(12) Install six new screws (21) nut (22), and

adequate precautions to assure

seven washers (23). Torque screws to 45 to 50 inch-

maximum

safety

for

adjacent

pounds. (13) Install two new screws (18), two washers

maintenance personnel in or near the

(19) and two washers (23). Torque screws to 45 to 50

laser line-of-sight,

Wear safety

inch-pounds.

goggles.

(14) Slip two universal joints (17) on their

(7) Turn LASER MODE CONTROL switch on

respective coupling shaft on optical bench assembly

the commander's control unit ON.

(24). Ensure all setscrews (16) contact a flat on each

(8) Press and release RANGE switch on the

shaft. Seal threads of setscrews (16) with sealant. MIL-

R/T control unit. The laser will fire through the lens

S-22473, and torque to 42 to 54 inch-ounces.

assembly causing a burn spot on the chart paper.

(15) Connect connector A76W1P3 (15) to

connector A76W2J5 on main housing assembly (106).

3-20