TM 5-6675-270-15
the lead screw and stop nut for burs, wear, and
6-28. Assembly
damage.
the horizontal slowmotion screw assembly.
c. Repair. Remove all burs. Chase threaded
parts having minor thread damage. Replace all
b. Adjust the horizontal slowmotion screw
defective parts that cannot be repaired.
Section VIII. HORIZONTAL CIRCLE HOUSING AND INNER BASE
foreign matter from the electrical receptacles,
6-29. General
cables, and contacts.
The horizontal circle housing and inner base in-
b. Inspection. Inspect the horizontal circle
clude the instrument receptacles, contacts and
housing and inner base for cracks, burs, dents,
electrical connections for nighttime operation, the
and other damage. Inspect the electrical cables
horizontal clamp assembly, and the vertical axis
for damaged insulation and broken or frayed
assembly, Components of the horizontal circle are
wires. Inspect the receptacles for cracks, breaks,
also included. The horizontal circle housing and
and damaged terminals. Inspect the clamp assem-
inner base, when installed on the instrument are
bly for burs and excessive wear. Inspect all hard-
located between the tribrach assembly and the U-
ware for damaged threads and heads.
frame.
c. Repair. Remove all burs and minor dents,
Chase threaded parts having minor thread dam-
6-30. Disassembly
age. Replace defective parts that cannot be
a. Remove the horizontal circle housing and
repaired.
the inner base (para 5-12).
6-32. Assembly
zontal circle housing and inner base.
zontal circle housing and inner base.
b. Install the horizontal circle housing and
a. Cleaning. Clean all metal parts with a clean-
inner base (para 5-12).
ing solvent and dry thoroughly. Remove dirt and
Section IX. HORIZONTAL CLAMP ASSEMBLY
b. Inspection. Inspect the knob, bushing, pin,
6-33. General
horizontal clamp, clamp jaw, and tube connector
The horizontal clamp assembly, located on the
for burs, dents, and excessive wear. Inspect the
right side of the horizontal circle housing assem-
lockring, clamp, and clamp lever for cracks and
bly, serves to lock the rotatable U-frame in any
breaks.
horizontal position until the clamp is released.
c. Repair. Remove all burs, dents, and nicks.
6-34. Disassembly
Replace defective parts that cannot be repaired.
Refer to figure 5-6 and remove and disassemble
6-36. Assembly
the horizontal clamp assembly.
Refer to figure 5-6 and assemble and install the
horizontal clamp assembly.
a. Cleaning. Clean all parts with a cleaning
solvent.
Section X. HORIZONTAL CIRCLE ASSEMBLY AND OUTER VERTICAL AXIS
6-38. Disassembly
6-37. General
a. Remove the horizontal circle assembly and
The horizontal circle assembly is a glass circle
outer vertical axis (para 5-14).
graduated in degrees or roils, depending on the
model, and is used to measure azimuth angles.
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