TM 5-6675-270-15
Section III. COLLIMATION LEVEL COVER AND COLLIMATION LEVEL MIRROR
b. Inspection. Inspect parts for burred edges
6-9. General
and dents. Inspect the screws or threaded parts
The collimation level cover is located on the left
for worn or damaged threads. Inspect the mirror
side of the U-frame directly below the collimation
and windows for scratches or etching.
level mirror. The collimation level mirror enables
the operator to observe the position of the vertical
c. Repair. Remove burs and any minor dents.
collimation level bubble.
Polish the mirror with a non-abrasive polishing
compound. Chase threaded parts having minor
6-10. Disassembly
thread damage. Replace all defective parts that
Refer to figure 5-3 and remove and disassemble
cannot be repaired.
the collimation level cover and collimation level
mirror.
6-12. Assembly
Refer to figure 5-3 and assemble and install the
collimation level mirror and collimation level
a. Cleaning. Clean all metal parts with a clean-
cover.
ing solvent. Polish the metal mirror and glass
windows with a soft cloth or tissue.
Section IV. ILLUMINATION MIRROR AND RETICLE MIRROR ASSEMBLIES
hol. Polish the metal mirror with a soft cloth or
6-13. General
tissue.
The illumination mirror assembly is located on
the left-side cover of the U-frame. It is used to
b. Inspection. Inspect the mirrors for cracks,
light the vertical and horizontal circles during
breaks, scratches, and loose backing. Inspect the
daylight operations. The reticle mirror assembly
mirror housing and sleeve for bends, cracks, and
is located on top of the telescope axis and provides
scored or worn bearing surface. Inspect the hard-
illumination of the reticle when the electric illumi-
ware for worn or damaged threads. Inspect the
nation system is used.
pin for wear and scoring.
c. Repair. Remove burred edges and minor
6-14. Disassembly
dents. Lubricate the hinge pin sparingly, Chase
Refer to figure 5-3 and remove and disassemble
threaded parts having minor thread damage. Re-
the illumination mirror and reticle mirror
place a broken mirror and all defective parts that
assemblies.
cannot be repaired.
6-16. Assembly
a. Cleaning. Clean all metal parts with a
Refer to figure 5-3 and assemble and install the
cleaning solvent. Clean the glass mirror with a
illumination mirror and reticle mirror assemblies.
soft cloth moistened with acetone or grain alco-
HORIZONTAL CIRCLE CLAMP ASSEMBLY
Section V.
6-17. General
zontal circle clamp assembly.
The horizontal circle clamp assembly is located in
the upper part of the horizontal circle housing at
the rear of the theodolite. Its function is to clamp
a. Cleaning. Clean all parts with a cleaning
the horizontal circle in position for reference
solvent.
during operation of the theodolite.
b. Inspection. Inspect the springs for excessive
wear or damage. Inspect all hardware for ex-
6-18. Disassembly
cessive wear and damaged threads. Inspect the
a. Remove the horizontal circle clamp assembly
clamp lever and bearing for burs, dents, and
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