TM 11-5985-355-13
CAUTION
(b) Remove two setscrews(SM-D-889199-1)
Do not use any other type lubricant on
and cap screw (SM-B-889207) with dust cover (SM-C-
this O-ring.
(This lubricant will not
8892303).
freeze up or prevent frequency selector
(c) Push rf cable assembly out of spring
switch S1 from rotating in extreme cold
mount assembly from the flange end; do not attempt to
weather.)
pull the rf cable out from the threaded end.
(b) Lubricate anticapillary gasket (SC-D-
(2) Replacement.
877432) with silicone compound (item 3, app E), and
install the gasket in the base assembly.
(a) Remove all dirt, grease and fungus from
(c) Install O-ring (supplied) on J2 and
inside of the spring mount.
If necessary, use
lubricate with the silicone compound.
trichloroethane (item 1, app E) in a properly ventilated
(d) Install O-ring (supplied) on J1 and
area for cleaning.
(b) Apply a bead of type I sealant (item 8,
lubricate with the silicone compound.
(e) Slide matching unit case onto shaft of
app E) around the circumference of the shell of rf cable
selector switch and seat the case firmly against the base
assembly (fig. 6-2) that is assembled into the flanged
assembly.
end of spring mount assembly. Apply one bead above
(f) Check frequency selector switch for
the groove for the setscrews and one below.
binding. If the shaft binds, loosen the bushing nut (SM-
(c) Apply a thin film of silicone compound
C-889212) so that the bushing is free to find a position
(item 3, appx E) to O-rings (MS9068-114 and MS9068-
that does not bind. Retighten the nut to a torque of
213) and assemble to rf cable assembly.
(d) Insert the rf cable assembly into the flanged
50inch-pounds.
(g) Replace six screws (MS3212-21) to
end of the spring mount assembly.
secure case to selector assembly.
(e) Twist the short body connector rf cable
(h) Replace case eight mounting screws
assembly in spring mount, and secure with two
(MS1959-31) to base assembly. Tighten screws to a
setscrews (SM-D-889119-1) and cap screw (SM-
torque of 20 in.-lb using a torque screwdriver (sec. III,
889207) with dust cover (SM-C-889230-3).
app C).
(f) Apply a thin film of silicone compound to O-ring
(i) Replace nuts and the lockwashers dust
(MS90684)15) and press it into the groove at the
caps on J1 and J2 connectors.
threaded end of spring mount assembly.
(j) Align the white line on the knob with the
(g) Apply a thin film of silicone compound to
black line on shaft of frequency selector switch and
O-ring (MS9068-213) and press into groove at top of
secure using screw (MS210977-06006).
base assembly.
c. Anticapillary Gasket (fig. 64).
(h) Replace cable mount to base assembly
(1) Removal.
with six lockwashers and cap screws.
(a) Remove case, matching unit (b(l)
and 6-4).
above).
(1) Removal.
(b) Remove anticapillary gasket (SC-D-
877432).
(a) Remove dust caps, mounting nuts and
(2) Replacement.
the lockwashers from J1 and J2 connectors.
(a) Lubricate the gasket (SC-D-877432)
(b) Remove screw (MS21097-6006) and
with a light film of silicone compound (item 3, app E).
knob (MS91524-1) from frequency selector shaft.
Reassemble the MX-9146/GRC as
(b)
(c)
Remove six screws (MS3212-21)
described in (b(2) above).
securing base to selector assembly.
d. J1 Connector Assembly (fig. 6-3 and FO-1).
(d) Remove eight case mounting screws
(1) Removal.
(MS51959-31) from base assembly.
(e ) While holding the matching unit,
(a) Remove matching unit case (b(l) above).
carefully press in on the frequency selector shaft and
(b) Unsolder rf connections at J1 connector
disengage case from base assembly. When sliding
assembly.
matching unit case off selector assembly, allow
(c) Remove J1 connector assembly (SM-B-
connectors to drop through case holes.
889239).
(2) Replacement.
(2) Replacement.
(a)
Lubricate O-ring (MS29513-06) on
(a) Connect the outer conductor (braid) of rf
frequency selector switch S1 with pneumatic grease
coaxial cable to the ground lug of J1 connector assembly
(item 9, app E).
(SM-B-889239) with No. 22 AWG wire.
Change 2 6-4
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