TM 5-6675-302-14&P
CHAPTER 3
OPERATORS MAINTENANCE INSTRUCTIONS
Section I. BASIC ISSUE ITEMS
3-1. Repair Parts, Tools and Equipment. Repair
parts and tools issued with or authorized for the
target set are listed in appendix E.
Section II.
3-2. General Lubrication Information.
parts of the tribrach, with both smooth
LUBRICATION INSTRUCTIONS
All moving
and thread-
ed surfaces,
are fitted with extremely fine
tolerance. For this reason most parts of the target
set must be cleaned before being lubricated. Any
attempts to lubricate the target set without first
cleaning it may result in damage to the equipment
and may render it unfit for use.
3-3. Detailed Lubrication Information.
a. Cars of Lubricants. Special care should be
taken to see that all surveying instrument lu-
bricants are kept absolutely free from contamina-
tion by a foreign substance. Containers should be
stored in a clean, dry place, and wiped free of dirt
or dust before they are opened. All lids or bottle
tops must be kept airtight.
b. Approved Lubricants. Approved lubricants
are noncorrosive and highly refined, and must be
free from all paint-removing ingredients. The
following lubricants are approved for use with the
target set.
(1) OCW: Oil, clock and watch, MIL-L-3918.
(2) GIA: Grease, aircraft and instruments,
MIL-G-23827.
c. Components Requiring Lubrication.
(1) Leveling screws. Turn the leveling screws
(fig. 2-11 for model 242406, or fig. 2-12 for model
USATS-79) outward to the extreme limit of travel.
Clean well with a lint-free cloth. Apply grease
(GIA) sparingly and run the screws through their
travel several times to distribute evenly. Wipe all
excess grease off the leveling screws.
(2) Tribrach locking plate. Thoroughly clean
all contact points on the tribrach locking plate,
knob, and its guides, using a lint-free cloth, Using
grease (GIA), lubricate all contact points sparing
ly operate locking knob several times to distribute
the grease evenly, wipe all excess grease off.
(3) Spring plate. The stop sides of the spring
plates which contact the leveling screws to hold
them snuggly against the tripod head should be
lubricated sparingly as occasion may require, us-
ing grease (GIA).
Section III. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
3-4. General.
To insure that the target set is
mind the CAUTIONS and WARNINGS. After
ready for operation at all times, it must be in-
operation, be sure to perform your (A) PMCS. If
spected systematically so that the defects may be
discovered and corrected before they result in
your equipment fails to operate, troubleshoot with
proper equipment. Report any deficiencies using
serious damage or failure. Defects discovered dur-
the proper forms, see TM 38-750.
ing operation of the unit shall be noted for future
corrections, to be made as soon as an operation has
3-5. Preventive Maintenance Checks and Ser-
ceased. Stop operation which would damage the
vices. Refer to Table 3-1 for Preventive Main-
equipment if operation were to continue. All defi-
tenance Checks and Services.
ciencies and shortcomings shall be recorded
together with the corrective action taken on DA
a. Item Number Column. Checks and services
Form 2404,
E q u i p m e n t I n s p e c t i o n a nd
are numbered in chronological order regardless of
Maintenance Worksheet, at the earliest opportuni-
interval. This column will be used as a source of
ty. When performing your Before Operation (B)
item numbers for the TM Item Number column on
and During Operation (D) PMCS, always keep in
DA Form 2404 in recording results of PMCS.
3-1