4-7. Operator's Quarterly Preventive Maintenance Checks and Services Chart
Item to be inspected
a few drops of oil (OAI) in the
oilcups on each reel handle bear-
ing and in the oilhole on the
b. TM 11-6675-200-10.
b.Clean and lubricate the theodolite
Inspect the hydrogen generator (fig.
16) for signs of damage. Replace
unit if damaged.
Water can _______________________
signs of leaks and damage. Replace
defective water can.
Sounding balloon and pilot balloon
for signs of damage. Replace defec-
and cracks. Replace defective hose.
While making the operating checks
Knobs, switches, and indicators ____
(items 8 through 12), check to see
that the mechanical action of each
knob, switch, and indicator is smooth
and free of external or internal
a. Install the head and chest sets. The
Head and chest set ________________
b. Establish two-way communication
between the sites. Undistorted
audio should be heard in both
spring winding knob.
b. Return the second and minute hands
to the zero (60) position by press-
ing the return to zero pushbutton.
c. Press the start-stop pushbutton and
simultaneously start a timing
source of known accuracy.
d. Allow the timer to operate for sev-
eral minutes. The time indicated
on the timer should agree with
that of the timing source. If the
time is either slow or fast, re-
move the speed regulator cover
plate and move the speed regula-
tor (not shown) in the proper di-
e. Repeat the procedures in b, c, and
d above until the timer agrees
with the timing source.
to see that the pointer is free and