TM 11-6720-242-35
imc assembly (144) in the marked space of the spur
(b) Remove the pin (92) and pull the helical gear and
gear (130).
sprocket assembly (93) from the prism shaft.
(g) Drive in and stake the taper pin (131) securing the
(c) Install the prism assembly (95) in the prism bracket
spur gear (130) to the shaft (134).
(102) and housing (198) check the end play under a
c. Removal of Gear, Cam, and Shaft Assembly.
reversing axial load of 3.5 0.25 pounds.
(1) Removal.
(d) Add the shims (96) as required to limit the end play
between 0.0002 and 0.0022 inch.
(a) Remove puck (61, fig. 3-4 (3)) and cam and shaft
(e) Mesh the marked tooth of the cluster gear and spur
assembly (60) (para 442).
assembly (136) in the marked space on the prism
(b) Remove pin (91, fig. 34 (4)) securing spur gear (90)
assembly and the helical gear and sprocket assembly
to the shaft (89). Remove the spur gear and shims, if
(93). Then drive the taper pin (92) into the sprocket,
any were used, from the shaft (89).
making sure that neither end of the pin extends into the
(c) Withdraw the shaft (89) with the flange (82),gear
space in which the drive belt travels.
(86), and cam (87) from the housing (198).
(f) Aline the phasing hole in the camera body with the
(2) Replacement.
phasing hole in cam and gear shaft assembly (60).
(a) Replacement of the gear cam, and shaft assembly
Insert an alinement pin in both holes.
is a reversal of the removal procedures and conformity
(g) Line up the red dot on the gear (86) with the red dot
to the special instructions described below.
on the sprocket of the helical gear and sprocket
(b) With the bearings (88) installed in the housing (198)
assembly (93), using a straight edge. Install the drive
and the sprocket wheel, cam, and shaft assembly
belt (79).
assembled in place, check the end play. Add shims, as
(h) Apply glyptal adhesive to the threads of the screws
required, to limit the end play between 0.001 and 0.003
(81) and (83) and attach the flanges t80) and (82) to the
inch.
respective sprockets (93) and (85).
(c) Stake the taper pin (91) in place.
b. Removal and Replacement of Cluster Gear and Spur
d. Removal of Sprocket, Gear, and Flange Assembly
Gear Assembly (fig. 2-6).
(fig. 2-).
(1) Removal.
(1) Removal (fig. 34 (5)) (a) Remove the pin (131
securing the spur gear (130) of the cluster gear and spur
(a) Remove two screws (33, fig. 3-4 (2)) securing the
gear assembly (136) to the shaft (134).
shield (32) to the block (34).
(b) Remove the spur gear (130) and the shim (132).
(b) Remove the retaining ring (117, fig. 3-4 (5)) from
(c) Withdraw the assembled cluster gear and shaft.
the shaft of the trunnion (120).
(2) Replacement.
(c) Remove the retaining ring (115) from the sprocket,
(a) Replacement of the cluster gear and spur gear
gear, and flange assembly (119).
assembly is a reversal of the removal procedures of (1)
(d) Remove the positive drive belt (116) from the
above and the special instructions described below.
sprocket, gear, and flange assembly (119).
(b) With the bearings (133) installed, insert the shaft
(e) Remove the three screws (121) securing the
(134), with the cluster gear (136) and the spacer (135),
trunnion (120) to the housing (198) (2) Replacement (fig.
into the housing.
(c) Mesh the marked tooth of the cluster gear (136) into
(a) Replacement of the sprocket, gear, and flange
the marked space on the helical gear and sprocket
assembly is a reversal of the removal procedures of (1)
assembly (93).
above and conformity to the special instructions
(d) Assemble a shim (132) and the spur gear (130) on
described below.
the shaft (134).
(b) Use the shims as required between the trunnion
(e) Check the end play under a 3.5 t 0.25 pound
(121) and the bearing (118) to position the outer face of
reversing load. Add the shim (132) as required to limit
the sprocket (119) 4.662 inches from the inner surface
the end play, between 0.002 and 0.0022 inch under the
of the housing.
reversing load.
(f) Mesh the marked tooth of the spur gear (150) of the
Change 3 4-23
