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(2) Replace housing (10), fig. 40. The red dot of speed dial (6) should align with the shutter speed index as in c above. If it does not, repeat the procedure in (2) above until it does.

d. Remove housing (10), tighten 2 screws (14), fig. 41. and replace housing on meter circuit

insert.

e. Check that sensitivity switch (14), fig. 40, is engaged with sensitivity switch linkage (22),

fig. 41.

j. Secure housing (10), fig. 40, to meter circuit insert (13), with 2 screws (9) and 2 screws (8).

g. Place washer (11), fig. 40, on shaft of coupling knob (21), fig. 41.

h. Place speed dial (6), fig. 40, spacer washer (4), spacer washer (5), and aperture dial (3) on shaft of the sector gear.

NOTE: Spacer washers (4) and (5) normally remain attached to aperture dial (3).

Position aperture dial so as to fit its rivet into the guide slot of the speed dial.

i. Secure the aperture dial with screw (1) using tool 3,719.004.01/5W1NY.

j. Mount the exposure meter on the camera and align with the camera top plate as described in TM 11-6720-244-12, paragraph 5-3b.

Section III. LENSES

5-26. General

Before reassembling a lens, all components should be inspected for damage, cleaned, and lubricated where required. Parts should not be forced, and scribed mating marks should match. Lenses should be checked photographically after reassembly.

5-21 Reassembly of 35mm Lens

(Fig. 42)

a. Replace depth-of-field ring (24) and 3 screws (23).

b. Replace focusing ring (20) with pressure spring (21) and sliding bar (22). Screw in retaining ring (19) and dowel screw (18).

c. Reassembly of Diaphragm.

(1) Install 10 diaphragm blades and diaphragm guide ring in lens tube (17).

(2) Mount rear optical components in lens tube (17).

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(3) Slide front optical components into lens tube (17) and secure with retaining ring using tool 42-672.01-3-1W1NY.

d. Replace inner ring (16), 2 guide screws (12). circular clip (13). ball (15) and spring (14).

e. Slide on diaphragm adjusting ring (11). Secure with retaining ring (10) and set screw (9).

f. Replace front ring (7) and 3 screws (6).

g. Replace serial number ring (4) and secure with fluted tube (3).

h. Slide on adjustment ring (8) and screw in retaining ring (5).

5-28. Reassembly of 50mm Viewing Unit

(Fig. 45)

NOTE: Bonding of most components prevented complete disassembly of the viewing unit. Reassembly is limited to parts previously disassembled.

a. Replace stop (16) and screw (15).

b. Replace finger grip (13) and 2 screws (12).

5-29. Reassembly of 50mm Helical Focusing Assembly

(Fig. 44)

NOTE: Due to the necessity of matching the focusing assembly to the focal length of the lens, it was not completely disassembled.

Replace nipple (2), stop spring (5), segment (4) and 2 screws (3).

5-30. Reassembly of 50mm Lens Head and Focusing Scale Assembly

(Fig. 43)

a. Attach segment (23) to stop ring (25) with 3 screws (22).

b. Attach stop (21) to focusing ring (19) with screw (20).

c. Slide focusing ring (19) over stop ring (25).

d. Screw sleeve (17) with spring (18) into stop ring (25).

e. Attach assembled components (of d above) to the helical focusing assembly (fig. 44) with retaining ring (16).

f. Slide on cover ring (15).

g. Reassembly of Diaphragm. (1) Position 10 diaphragm blades (12) in lens tube (14).



(2) Position diaphragm guide ring (11) in lens tube (14).

h. Slide on inner ring (13) and replace 2 guide screws (10).

i. Position ball (0) and flat spring (8) in slot of inner ring (13).

j. Slide on diaphragm adjusting ring (7) and replace 2 set screws (6) and 1 dowel screw. k. Slide index ring (5) onto lens mount (3) and replace set screw (4). l. Screw lens mount (3) into lens tube (14). 5-31. Reassembly of 135mm Viewing Unit

(Fig. 48)

a. Replace optical element (15) and flat spring (14). Tighten 2 adjusting screws (13).

b. Replace pressure spring (8), retaining plate (7) and 1 screw (6).

c. Attach cover plate (4) with 4 screws (2) and 3 screws (3).

d. Replace 2 cover screws (1).

5-32. Reassembly of 135mm Focusing Mount

(Fig. 47)

a. Attach bayonet ring (3) and viewing unit assembly (7) to differential cam assembly (8) with 6 screws (2).

b. Mount depth-of-field ring K(13) on helical focusing assembly (14). Secure with retaining ring (12) using tool 42-37.01-U60W3NY.

c. Attach stop (11) with screw (9) and nut (10).

d. Slide helical focusing assembly (14) over differential cam assembly (8). Secure with coupling ring using tool C42-37.01-U80T8.

e. Replace screw (6), tripod bushing plate (5) and 2 screws (4).

5-33. Reassembly of 135mm Lens Head

(Fig. 48)

a. Assembly of Diaphragm.

(1) Position 12 Diaphragm blades (20) in lens tube (21).

(2) Place diaphragm guide ring (19) in lens tube (21) and secure with circle clip (18). Replace guide screw (17).

b. Screw lens mount (14) into lens tube (21) and replace set screw (13).




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