ARMY TM 5-6675-308-12
MARINE CORPS TM 08837A-12/1A
d. IMU Cover Clamping Catch Replacement.
(a) Disconnect cable assembly W5 connector
W5P3 from I MU fan connector 2J5.
(1) Removal.
(b) Raise IMU cover.
(a) Raise IMU cover.
(c) Remove three screws securing fan guard
(b) Remove two screws, washers, and nuts se-
standofFs to IMU cover. Remove fan guard
curing clamping catch. Remove catch.
assembly.
(2) Replacement.
(d) Loosen four screws securing fan clamps.
(a) Secure clamping catch to IMU cover with
Rotate clamps to free fan. Remove fan.
two screws, washers, and nuts.
(2) Replacement.
(b) Secure IMU cover.
(a) Set fan on IMU cover with connector
e. Porro Prism Cover and Chain Replacement.
pointed as shown. Ensure that airflow arrow
See figure 4-6 and replace porro prism cover as follows:
on fan points upward.
(1) Removal.
(b) Rotate four clamps to secure fan and tighten
screws.
(a) Release two clamping catches and remove
porro prism cover from IMU.
(c) Replace fan guard assembly and secure with
three screws.
(b) Remove screw and two washers securing
chain to porro prism cover.
(d) Secure cover.
(c) Remove screw, lockwasher, and washer se-
( e ) Connect cable assembly W5 connector
curing chain to IMU; remove chain.
W5P3 to IMU fan connector 2J5.
(2) Replacement.
b. IMU Fan Guard Replacement.
(a) Secure chain to porro prism cover with
(1) Removal.
screw and two washers.
(a) Raise IMU cover.
(b) Fit porro prism cover to IMU and secure
(b) Remove three screws securing fan guard
with two clamping catches.
standoffs to IMU cover. Remove fan guard
(c) Secure chain to IMU with screw, lock-
assembly.
washer, and washer.
(c) Unscrew three standoffs from fan guard.
(2) Replacement.
a. Fan Replacement.
(a) Screw three standoffs onto fan guard.
(1) Removal.
(b) Replace fan guard assembly and secure with
three screws.
(a) Disconnect cable assembly W3 connector
W3P1 from PS connector 3J5.
(c) Secure IMU cover.
(b) Disconnect cable assembly W5 connector
c. IMU Cover Replacement.
W5P2 from PS connector 3J1.
(1) Removal.
(c) Disconnect cable assembly W4 connector
(a) Remove fan and fan guard assembly in ac-
W4P2 from PS connector 3J3.
cordance with paragraph 4-12a(1).
(d) Loosen four captive screws securing PS to
(b) Remove seven screws and washers securing
primary pallet, remove PS.
cover hinge to IMU. Remove cover.
(e) Remove three screws and washers and one
(c) Remove four screws, washers, nuts and two
terminal lug securing fan guard to PS; re-
clamping catches from cover.
move fan guard.
(f) Disconnect fan cable from PS connector J6.
(2) Replacement.
(a) Secure two clamping catches to IMU cover
(g) Loosen three screws, washers, and clamps
with four screws, washers, and nuts.
securing fan to PS; remove fan,
(b) Secure cover hinge to IMU with seven
(2) Replacement.
screws and washers.
(a) Install fan on PS and secure with three
(c) Replace fan and fan guard assembly in ac-
screws, washers, and clamps. Orient fan so
that airflow arrow is pointing down.
cordance with paragraph 4-12a(2).
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