TM 5-6675-270-15
OPERATOR'S MAINTENANCE INSTRUCTIONS
Section l. BASIC ISSUE ITEMS
3-1. Tools and Equipment
Tools, equipment, and repair parts issued with or
FSN or part
Figure
authorized for the theodolite are listed in the
Use
number
number
Item
basic issue items list, appendix C.
2-6 Circular level
Screwdriver, flat
5120-446-2860
adjustment
tip
3-2. Special Tools and Equipment
26 Adjust theodo-
Pin, adjusting
6675-353-4103
The special tools required to perform operator's
lite adjusting
maintenance on the theodolites are listed in table
screws.
3-1 and appendix C. References and illustrations
indicating the use of these tools are listed in the
24 Tripod leg ad-
5120-378-9520
Wrench, tripod
justment, and
table. No special equipment is required by opera-
removal and in-
tor personnel for performing maintenance on the
stallation.
theodolites.
LUBRICATION INSTRUCTIONS
Section Il.
c. Approved Lubricants. No lubricants other
than those approved for use on surveying instru-
All moving parts of the theodolite, with both
ments will be stocked. Approved lubricants are
smooth and threaded surfaces, are fitted within
noncorrosive and highly refined, and must be free
extremely fine tolerances. For this reason most
from all paint removing ingredients. Ordinary
parts of the theodolite must be cleaned before
machine oil is not an approved lubricant. The fol-
being lubricated. Any attempt to lubricate the
lowing lubricants are approved for use on this
theodolite without first cleaning it may result in
theodolite:
damage to the instrument, and may render it
(1) OCW: oil, clock and watch MIL-L-3918.
unfit for use. Unless specifically called for, no
lubrication will be performed in the field.
(2) GIA: grease, aircraft and instrument
MIL-G-23827.
CAUTION
d. Component Requiring Lubrication.
Never perform any lubrication operation
(1) Leveling screws. Turn the leveling
other than that specified or use lubricants
other than those that are specifically
screws (fig. 11 and 12) outward to the extreme
approved for use on the instrument.
limit of their travel. Clean well with a lint-free
cloth. Apply grease (GIA) sparingly and run the
3-4. Detailed Lubrication Information
screws through their travel several times to dis-
tribute the grease evenly. Wipe off all excess
a. General. Keep all lubricants in closed con-
tainers and store in a clean, dry place away from
grease.
(2) Tribrach backing plate. Unlock the tri-
external heat. Allow no dust, dirt, or other foreign
material to mix with the lubricants. Keep all
brach clamp. Remove the tribrach and thoroughly
lubrication equipment clean and ready to use.
clean all contact points on the tribrach, locking
b. Cleaning. Keep all external parts not re-
plate, and the lever (knob) and its guides. Using
quiring lubrication clean of lubricants. Before
grease (GIA), lubricate all contact points spar-
ingly. Position the tribrach on the instrument and
lubricating the equipment, wipe all lubrication
points free of dirt and grease. Clean all lubrica-
secure it with the tribrach clamp.
(3) Spring plate. The sloped sides of the
tion points after lubricating to prevent accumula-
spring plate (fig. 15 and 16), which contact
tion of foreign matter.
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