Section I. COMPASS AND COMPASS BRACKET ASSEMBLY

TM 5-6675-270-15

CHAPTER 6

REPAIR INSTRUCTIONS

Section I. COMPASS AND COMPASS BRACKET ASSEMBLY

acetone. Clean the window with an approved

6-1. General

glass cleaner. Brush all threaded surfaces free of

The compass, provided with the theodolite, en-

dirt and foreign matter.

ables the operator to rapidly orient the target

b. Inspection. Inspect all threaded surfaces for

with magnetic north.

damage or wear. Inspect the compass base,

housing, and compass legs for bends, breaks,

6-2. Disassembly

dents, or burs. Inspect the needle bearing for

a. Remove the compass from the theodolite

excessive wear. Inspect the prism and lens for

(para 5-6).

cracks, chips, or breaks.

b. Refer to figure 6-1 and disassemble the com-

c. Repair. Chase all threaded parts having

pass and compass bracket assembly.

minor thread damage. Smooth out burs. Replace

NOTE

unserviceable parts with serviceable ones.

It will be necessary to use special tool shown in

figure 5-1 to remove locking ring (40, fig. 6-1).

6-4. Assembly

a. Refer to figure 6-1 and assemble the com-

6-3. Cleaning, Inspection and Repair

pass bracket assembly.

a. Cleaning. Clean all metal parts with a clean-

ing solvent. Clean and polish the prism and lens

b. Install the compass on the theodolite (para

with lens tissue moistened in grain alcohol or

5-6).

Section II. TRIBRACH ASSEMBLY

ing solvent. Clean the circular level glass with a

6-5. General

soft cloth or tissue.

The tribrach, leveling screw, and base plate as-

sembly form a leveling base between the bottom

b. Inspection. Inspect all threaded parts for

of the theodolite and the tripod head. The tribrach

worn or damaged threads. Inspect the base plate

contains the circular level, which shows whether

and spring plate for dents, cracks, breaks, and

the tribrach (and therefore, the theodolite itself)

burs. Inspect the tribrach for cracks and breaks.

is level. The leveling screws are mounted in the

Inspect the clamp lever for burs and wear. In-

three mounting lobes of the tribrach, with their

spect the leveling screw components for binding

other ends clamped snugly against the base plate.

or loose fit.

Adjusting one or more of the leveling screws

c. Repair. Remove all burred edges and minor

either up or down will bring the tribrach to a

dents. Chase threaded parts having minor thread

level position.

damage. Replace defective parts that cannot be

repaired.

6-6. Disassembly

a. Remove the tribrach assembly (para 4-28).

6-8. Assembly

b. Refer to figure 6-2 or 6-8, as applicable,

a. Refer to figure 6-2 or 6-3, as applicable, and

and disassemble the tribrach assembly.

assemble the tribrach assembly.

b. Install the tribrach assembly (para 4-30).

6-7. Cleaning, Inspection, and Repair

c. Adjust the circular level (para 2-9).

a. Cleaning. Clean all metal parts with a clean-

6-1

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