TM 5-6675-270-15
c. Repair. Straighten all bent or dented parts
and smooth all rough surfaces. Replace all dam-
aged or worn parts that cannot be repaired.
6-88. Assembly
vertical circle assembly.
b. Install the vertical circle assembly (para
2-26).
assembly.
Section XXIII.
COLLIMATION SLOWMOTION SCREW ASSEMBLY
b. Inspection. Inspect all threaded surfaces for
6-89. General
worn or damaged threads. Inspect the spring for
The collimation slowmotion screw is used to de-
wear, breaks, and fatigue. Inspect the pin and
termine an exact horizontal line of sight for the
housings for burs, cracks, and bends. Inspect the
telescope. The screw is designed to travel slowly
adjusting screws and split nut for burs, wear,
so that the operator can make precise adjustments.
and damage.
6-90. Disassembly
c. Repair. Remove all burs. Stretch the spring
Refer to figure 5-12 and remove and disassemble
to provide better tension if it shows signs of
the collimation slowmotion screw assembly.
fatigue. Replace defective parts that cannot be
repaired.
a. Cleaning. Clean all parts with a cleaning
6-92. Assembly
solvent. Brush all threaded surfaces thoroughly
with a small brush dipped in a cleaning solvent.
the collimation slowmotion screw assembly.
Remove any grease or foreign matter from the
b. Adjust the collimation slowmotion screw
housings with a cotton swab moistened with a
cleaning solvent. Thoroughly clean the inside of
the lead screw, stop nut, and bushing.
Section XXIV. READING LENS ASSEMBLIES
6-94. Disassembly
6-93. General
The reading lens assemblies are located in the
5-28) .
left side of the U-frame below the collimation
lever. The reading lens assemblies magnify the
readings of the horizontal circle obtained by the
reading lens assemblies.
horizontal circle prism.
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