Replacement of Switch Lens Seal

TM 9-1240-369-34

KEY to fig. 3-1:

(5) Pull applicable switch lens (6 or 7) straight

out from cover assembly (3).

1. Screw-NAS1635-04-6

(6) Unscrew and remove switch boot adapter

2. Washer-AN960C4

(8) with switch spanner wrench (24, table 2-2).

3:. Cover assembly-11737915

(7) Remove switch S1 or S2 (10 or 11) and

4. Cover seal-11738857

sealing washer (12) from cover assembly (3).

5. Switch lens seaI-1173799-2

(8) Lubricate sealing washer ( 12) by applying

6. Switch lens-11741549-2

a thin, uniform film of grease MIL-G-4343.

7. Switch lens-11741549-1

(9) Install new switch S1 or S2 (10 or 11) an.

8. Switch boot adapter-11737539

sealing washer (12) to cover assembly (31.

9. Lamp-11738097

(10) Install switch boot adapter (8) with switch

10. RESET switch S1-11737454

spanner wrench (24, table 2-2). Seal adapter with

11. RANGE switch S2-11737454

sealant MIL-S-22473.

12. Sealing washer-NAS1598D8Y

(11) Push applicable switch lens (6 or 7) back

13. Knob-MS91528-OC1B

onto plunger of switch S1 or S2.

14. Boot- M5423/09-03

(12) Install switch lens seal (5) with boot

15. RTCL ILLUM potentiometer-11737448

removal tool (21, table 2-2).

16.. Housing-11738855

(14) Solder four color-coded wires to the

17. Screw-11737922

terminals on RANGE switch S2 (11).

18. Washer-NAS620C10L

(15) Install cover seal and cover assembly as

19. Shipping cover-11737928

described in paragraph 3-3 a. steps (3) and (4).

20. Gasket-11737356

e. Replacement of RTCL ILLUM Potentiometer.

b. Replacement of Switch Lens Seal (see fig. 3-1).

(1) Remove cover assembly and cover seal

as instructed in paragraph 3-3 a, steps (1) and 12).

(1) Unscrew and remove switch lens seal (5)

with boot removal tool (21, table 2-2) from cover

(2) Loosen two setscrews on the knob (13)

assembly (3).

and remove knob. Unscrew and remove boot (14) from

(2) Install new switch lens seal (5) with boot

shaft of RTCL ILLUM potentiometer (15).

removal tool (21. table 2-2).

(3) Remove RTCL ILLUM potentiometer from

c. Replacement of Lamps (see fig. 3-1). The

R/T control unit housing (16).

following steps are applicable to replacement of lamp in

(4) Note where the three color-coded wires

push button switches S1 and S2.

are connected; then unsolder from RTCL ILLUM

(1) Unscrew and remove applicable switch

potentiometer (15).

lens seal (5) with boot removal tool (21, table 2-2) from

(5) Solder three color-coded wires to new

cover assembly (3).

RTCL ILLUM potentiometer.

(2) Pull applicable switch lens (6 or 7) straight

(6) Install RTCL ILLUM potentiometer to R/T

out from cover assembly.

control unit housing (16). Rotate potentiometer to

(3) Remove lamp (9) from switch lens (6 -or

engage tang in slot provided in housing.

7).

(7) Lubricate boot (14) by applying a thin,

(4) Install new lamp (9).

uniform, film of grease, MIL-G-4343. Apply by hand.

(5) Push applicable switch lens (6 or 7) back

(8) Install boot (14) and knob (13) to RTCL

onto plunger of switch.

ILLUM potentiometer.

(6) Install switch lens seal with boot removal

(9) Install cover seal and cover assembly as

tool (21, table 2-2).

instructed in paragraph 3-3 a. steps (3) and (4).

d. Replacement of Switches S1 and S2 (see fig.3-

f. Removal and Installation of R/T Control Unit

1).

Shipping Cover (see fig. 3-1).

(1) Remove cover assembly and cover seal

(1) Loosen four screws (17) and four washers

as instructed in paragraph 3-6 a. steps (1) and (2).

(18).

(2) Removing shipping cover (19) and retain

(2) Record where the four color-coded wires

gasket (20) with R/T control unit.

are connected, then unsolder from RESET switch S1

(3) Lubricate gasket (20) by applying a thin

(10).

uniform, film of grease, MIL-G-4343, to the high point on

(3) Record where the four color-coded wires

the bead of the gasket. Do not apply so much grease

are connected, then unsolder from RANGE switch S2

that it fills the grooves on either side of the bead. Apply

(11).

by hand to both sides of the gasket.

(4) Unscrew and remove applicable switch

lens seal (5) with boot removal tool (21, table 2-2) from

cover assembly (3).

3-3