TM 3-6665-209-35
(d) Push the end of the stop shaft (25)
(l) Remove four screws (10) and
in so that the spring (22) is
lockwashers (9) that secure the
compressed and there is clearance
calibrator housing (8) to the
between the calibrator bracket (16)
calibrator plate (4). Separate the
and the retaining rings (20 and 29).
housing and plate and remove the
Remove these two retaining rings.
diaphragm (5).
Then hold the spring (22) and
(3) Cleaning and inspection.
remove the retaining ring (19).
(a) Clean all parts with dry-cleaning
(e) Slide the stop shaft (25) from the
solvent and wipe dry with a clean,
calibrator bracket (16) and catch the
dry cloth.
flat washer (23) and the spring (22)
(b) Make certain the solder joints at the
as they are pushed from the shaft
terminal lugs provide good electrical
by the bracket.
(f) Unthread and remove the needle
(c) Inspect the worm shaft, stop shaft,
assembly (15) from the contactor
and calibrator bracket for distortion.
insulator (13) pressed into the
Replace the component if it is bent
contactor needle bushing (12). The
or damaged in any way.
grommets (14) may remain on the
(d) Inspect the needle assembly and
shaft of the needle assembly.
worm for missing or damaged teeth.
Remove the grommets from the
Replace a component if it's
shaft or from the inside of the
damaged in any way.
contactor insulator.
(e) Check the free length of the spring.
1
(g) Remove four screws (31) and
It should measure 1 /2 inches.
lockwashers (32) that secure the
(f) Replace the contactor insulator and
contactor needle bushing (12) to the
grommets
regardless
of
their
calibrator housing (8). Remove the
apparent condition.
bushing with the contactor insulator
(g) Handle the calibrator plate (4) and
(13). Pull the insulator from the
the calibrator housing (8) with
bushing with a bearing puller.
extreme care. The concentricity,
(h) Remove the pipe to tube elbow (11)
flatness, and surface finishes are
from the calibrator housing (8).
critical. If there are burrs, scratches,
(i) Disconnect the tube coupling nuts
or any other internal surface
that connect the copper tube (46) to
defects, replace the component.
the plug cock (45) and the copper
(h) Inspect the diaphragm. Its surface
tube (44) to the plug cock (43).
must be smooth and free of dents,
Remove the copper tubes and their
wrinkles, and pin holes.
coupling nuts.
(i) Inspect the silver button on the
(j) Remove the adapter (41), elbow
diaphragm and the silver tip on the
(42), and plug cock (43) from the
needle assembly. Make certain no
cross (40). Unscrew the cross from
solder is on the front surface of the
the nipple (39) and unscrew the
button and that the spherical radius
nipple from the elbow (38).
of the tip is polished.
Unscrew the elbow (39) from the
(j) Inspect
the
threads
of
all
calibrator housing (8).
components for burrs or other
(k ) Unscrew the cross (2) with the two
damage.
If the threads are
adapters (1 and 48), elbow (47), and
damaged on nuts, screws, or pipe
plug cock (45) from the nipple (3).
fittings, replace the damaged item.
Remove these components from the
If the threads are damaged on such
cross and remove the nipple (3)
components as the
from the calibrator plate (4).
AGO 8069A
38