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Table 4-1. Instrument Leveling and Checks (Cont)
Up
TM-5-6675-329-13-P Self-Leveling Surveying Level (Wild Heerbrugg Model NA2-80) NSN
Next
Section V: TROUBLESHOOTING
TM 5-6675-329-13 & P
Table 4-2. Organizational Preventive Maintenance
Checks and Services
D - Daily
W - Weekly
M - Monthly
EQUIPMENT IS
INTERVAL
ITEM
ITEM TO BE
PROCEDURES
NOT READY/
NO.  D W M
INSPECTED
AVAILABLE IF
3
Circular
Check that bubble is centered through 180°of
Adjustment of foot-
Level
horizontal rotation.
screws and/or circu-
Bubble (8)
lar level adjusting
screws fails to keep
.
bubble centered
through horizontal
rotation of level.
4
Compensator
Check that after momentary pressing of the Push
Level does not re-
Action
button (7, Figure 1-2) Level automatically returns
assume a bubble-
Check
to its bubble-centered position.
centered position
after Pushbutton
is released.
5
Horizontality
Perform horizontality of the line of sight test and
Readjustments of
check that test readings and subsequent calculations
reticle plate adjust-
are within tolerances indicated in paragraph 4-10b(1).
ment screw (2,
indicated in
does not result in
acceptable horizon-
tality of line of
sight.
6
Focusing of
Check that instrument can be focused on levelling
Telescope cannot be
telescope
staff height markings as staff is moved further
focused throughout
and further away from automatic level (between
entire range indi-
5.3 ft. (1.6m) and at least 250 ft. (76.2m),
cated.
utilizing focusing knob (10, Figure 1-2)
4-6

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