damaged parts that cannot be repaired.
and fatigue. Inspect all threaded surfaces
for worn or damaged threads.
d. Reassembly. Refer to figure 55 and reassemble
the micrometer.
(5) Remove all burs and straighten minor
dents and bends. Replace the springs if
e. Installation. Refer to figure 54 and install the
they are defective. Replace all worn or
Section XI. HORIZONTAL, VERTICAL, AND COLLIMATION SLOW-MOTION SCREWS
107. General
d. Reassembly. Refer to figure 57 and reassemble
the horizontal, vertical, and collimation slow-motion
The horizontal slow-motion screw is mounted on
screws.
the horizontal clamp and located on the right side of the
theodolite.
It is used for precise pointing of the
e. Installation. Refer to figure 56 and install the
instrument in a horizontal plane. The vertical slow-
horizontal, vertical, and collimation slowmotion screws.
motion screw is located on the right side of the
theodolite. It is used to accurately point the instrument
in a vertical plane. The collimation slow-motion screw is
located on the left side of the theodolite and is used to
determine the horizontal line of sight by bringing the two
ends of the collimation level bubble to coincidence.
108. Horizontal, Vertical, and Collimation Slow-
Motion Screws
a. Removal. Refer to figure 56 and remove the
horizontal, vertical, and collimation slowmotion screws.
b. Disassembly.
Refer to figure 57 and
disassemble the horizontal, vertical, and collimation
slow-motion screws.
c. Cleaning, Inspection, and Repair.
(1) Clean all parts with an approved cleaning
solvent and dry thoroughly. Clean all
threaded surfaces thoroughly with a small
brush dipped in an approved cleaning
solvent. Remove all grease and foreign
matter from the inside of the housing and
sleeves.
(2) Thoroughly clean the inside of the
adjusting knobs, split nuts, stop nuts, and
screw housings.
(3) Inspect all threaded surfaces for worn or
damaged threads. Inspect the springs for
wear, breaks, and fatigue. Inspect the
adjusting knobs for burs and wear.
(4) Inspect the pins, housings, and adjusting
screws for wear, bends, burs, and other
damage.
(5) Remove all burs. Replace all defective
parts that cannot be repaired.
Figure 56. Horizontal, vertical, and collimation
slow-motion screws, removal and installation.
71
AGO 5078A
