lubricated sparingly as required. Remove
thoroughly lubricated, wipe off the excess oil with a
the star plate (par. 54). Apply lubricant
clean, lint-free cloth.
sparingly to the sloped edges of the
openings in the spring plate (fig. 1).
(2) Collimation lever bearing. Place 1 drop of
Install the star plate (par. 54).
oil at the top of the crack between the
(5) Horizontal circle drive knob cover hinge.
collimation lever (fig. 3) and the left side
Apply 1 drop of oil to the hinge pin in the
axis bearing (fig. 3). Work the oil into the
hinge of the horizontal circle drive knob
crack by alternately pushing and releasing
cover (fig. 4). Carefully work the cover
the lower part of the collimation lever
forward, backward, up, and down to
against the spring of the collimation slow-
distribute the oil over the working
motion screw (fig. 3). Wipe off all the
surfaces. Wipe off all excess oil with a
excess oil with a clean, lint-free cloth.
clean, lint-free cloth.
(3) Leveling screws. Turn the leveling screw
d. Lubrication Procedure. Cleaning and lubrication
(fig. 1) outward to the extreme length of
services, which require partial or complete disassembly
its travel. Clean it thoroughly with a
of the instrument, must be performed in the dust-free
clean, lint-free cloth. Lubricate sparingly
atmosphere of an instrument repair shop and only by
and run the screw through its travel
qualified personnel.
Disassembling the instrument
several times to distribute the lubricant
under other conditions, especially where dust might filter
evenly. Wipe off all excess lubricant.
into recesses, will do more harm than good. Since the
Lubricate the other two leveling screws in
lubricants must be applied sparingly, never use a
a similar manner.
container with a spout, such as an oil can, to squirt oil on
(4) Spring plate. The sloped sides of the
parts or into assemblies.
spring plate (fig. 1), which contact the
leveling screws to hold them securely
against the star plate (fig. 1), should be
Section III. PREVENTIVE MAINTENANCE SERVICES
This paragraph contains an illustrated tabulated
28. General
listing of preventive maintenance services which must
To insure that the theodolite is ready for operation at all
be performed by the operator. The item numbers are
times, it must be inspected systematically, so that
listed consecutively and indicate the sequence of
defects may be discovered and corrected before they
minimum requirements. Refer to Figure 26 for the daily
result in serious damage or failure. The necessary
preventive maintenance services.
preventive maintenance services to be performed are
30. Quarterly Preventive Maintenance Services
listed in paragraphs 29 and 30. The items numbers
indicate the sequence of minimum inspection
a. This paragraph contains an illustrated tabulated
requirements. Defects discovered during operation of
listing of preventive maintenance services which must
the unit shall be noted for future correction, to be made
be performed by organizational maintenance personnel
as soon as operation has ceased. Stop operation
at quarterly intervals. A quarterly interval is equal to 3
immediately if a deficiency is noted during operation,
calendar months, or 250 hours of operation, whichever
which would damage the equipment if operation were
occurs first.
continued. All deficiencies and shortcomings will be
b. The item numbers are listed consecutively and
recorded together with the corrective action taken on DA
indicate the sequence of minimum requirements. Refer
Form 2404 (Equipment Inspection and Maintenance
to figure 27 for quarterly preventive maintenance
Worksheet) at the earliest possible opportunity.
services
29. Daily Preventive Maintenance Services
AGO 5078A 33
