TM 11-5840-281-35/1
(42) Using feeler gauge for measurement, back
NOTE
off stop setscrew (50) for 0.020-inch clearance between
This completes the preliminary alignment. Final
setscrew and cam.
adjustment for circular polarization will be made
(43) Lock stop setscrew (50) at this position with
after radar set is completely assembled and as
nut (47), lockwasher (48), and flat washer (49).
part of the electrical checkout.
(44) Using screwdriver inserted in gear end of
motor shaft, turn shaft so that transition (80) rotates in
(53) Attach cover (9) and gasket (10) to
cw direction, as viewed from transition end toward horn
mounting plate (72) using 11 nuts (5), screws (6),
end, stopping when centerline of longer rectangular
lockwashers (7), and flat washers (8).
dimension of transition (80) is 45 degrees from centerline
(54) Complete attachment of cover (9) and
of longer rectangular dimension of horn (85).
gasket (10) using nut (1), screw (2), lockwasher (3), and
two flat washers (4).
NOTE
This is not a final adjustment and is not
NOTE
absolutely critical.
This is the approximate
The extra flat washer (4) is used under the head
circular polarized position for the waveguide.
of screw (2) to provide additional clearance for
mounting hardware.
(45) Determine which cam (46) and stop
setscrew (50) are associated with circular limit switch
5-10. Disassembly and Assembly of Elevation
S9301 (31), then position cam on motor shaft until it
rests firmly against setscrew.
(46) Adjust stop setscrew (50) until straight side
a. Disassembly. To disassemble elevation Antenna
of cam (46) is parallel with lip of bracket (58).
AS-1291/TPN-8 and yoke, proceed as follows:
(47) Tighten cam (46) at this position on motor
(1) Remove two nuts (1), screws (2),
shaft using screw (44) and lockwasher (45).
lockwashers (3), flat washers (4), and clamp (5).
(2) Remove two nuts (6), screws (7),
NOTE
lockwashers (8), flat washers (9), bracket (10), and
The cam lock screw (44) will be accessible
clamps (11).
through a hole in the lip of bracket (58).
(3) Remove two screws (12), lockwashers (13),
flat washers (14), and clamps (15).
(48) Adjust circular limit switch S9301 (31) by
(4) Remove two screws (16), lockwashers (17),
moving switch bracket (33) until it just actuates against
and flat washers (18).
cam (46).
(5) Remove two screws (19), lockwashers (20),
(49) Use feeler gauge for measurement and
and flat washers (21).
back off stop setscrew (50) for 0.020-inch clearance
(6) Remove two screws (22), lockwashers (23),
between stop setscrew and cam.
and flat washers (24).
(50) Lock stop setscrew (50) at this position
(7) Remove six pins (25) and horn assembly
using nut (47), lockwasher (48), and flat washer (49).
(26).
(51) Rotate motor shaft through its range several
NOTE
times and determine that transition centerline (80) aligns
Refer to paragraph 5-11 for disassembly
at 0 and 45 degrees in relationship to horn centerline at
procedures for elevation horn and polarizer
points that switches S9302 and S9301 actuate.
assembly (26).
(52) Reinstall waveguide (75) and collar (74);
secure in place with setscrew (73).
(8) Remove spherical nut (27), nut (28), pin (29),
and ball joint (30) from each arm (31, 32, and 33).
(9) Remove two screws (34), flat washers (35),
flat washer (36), and scope mount (37).
5-12
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