f. When it is necessary to remove connector (6)
f i c a t i o n P-C-458. Use aluminum oxide abrasive
from cable assembly (4), mark wiring for reconnec-
cloth, Federal Specification P-C-451 for polishing
tion and remove solder so that wires will be a slip fit
aluminum parts.
from connector (6).
b. Remove minor defects from threaded parts by
1-73. CLEANING.
tapping or chasing. Replace part or replace entire
assembly if tapping or chasing does not repair part.
c. Replace stop (12) and packing (13) at each over-
Use cleaning fluids in a well ventilated area.
haul regardless of condition.
Avoid breathing fluid vapors or vapor contact
with skin. Do not direct compressed air
1-78. LUBRICATION. Lubrication is not required.
against skin.
1-79. REASSEMBLY. (See figure 1-37.)
1-74. Clean all parts except electrical components in
dry-cleaning solvent, Federal Specification P-D-680.
NOTE
Electrical components, clean first: with ammonia,
Federal Specification U-A-500; second, alcohol, Mili-
Be sure magnet is completely demagnetized
tary Specification MIL-A-6091B; and third, methyl
before installing.
ethyl ketone, Federal Specification O-C-265. Use a
stiff camel's hair brush to remove stubborn accumu-
1-80. Reassemble in reverse order of disassembly
lations of dirt and foreign matter. Clean coil and pole
observing the following:
piece assembly (9) with lens paper and methyl ethyl
ketone. While cleaning, pay particular attention to all
a. Use two Taper Plugs, Part No. 28024-AE-3 to
internal passages, ports, and packing grooves. Dry
install packing (13, figure 1-37) in case (14).
with moisture-free compressed air or, in some
cases, a clean, lint-free cloth.
b. Use Button Setting Plug, Part No. 28024-AE-5 to
install magnet (10, figure 1-37) in case (14).
1-75. INSPECTION. Inspect parts for serviceability
as follows:
c. Check springs, coil, and bobbin of coil and pole
piece assembly (9) for dimension of 0.257 0.005.
a. Inspect all metal parts for cracks, nicks, burrs,
(See figure 1-38.)
and corrosion. Pay particular attention to machined
surfaces.
d. Apply a thin coat of Dow Corning 200 Fluid,
b . Inspect all threaded areas for crossthreading
100,000 cs to all the threads of coil and pole piece
and stripping.
a s s e m b l y (9) and the threads of the case (14).
c. Check gold plating of terminals on coil and pole
e. Place the reassembled parts (9 through 14) in
piece assembly (9) for worn or defective plating.
oven for two hours at 500F and then let air cool to
room temperature.
d. Check the spring alignment of coil and bobbin and
center pole piece by pushing center pole piece down
f. Remove the coil and pole piece assembly (9)
and releasing pressure. There must be no indications
from the housing (14), and remove all oil from the
of binding and coil and bobbin should spring freely.
coil and pole piece assembly.
1-76. COMPONENT TESTING. Individual component
g. Apply a thin coat of Dow Corning 510-50 cs fluid
testing is not required. All system testing is covered
to the sapphire guides of the coil and pole piece
in paragraphs 1-66 through 1-69.
assembly.
h. Replace the pole piece assembly in the case and
1-77. REPAIR OR REPLACEMENT. (See figure
hand tighten.
1-37.) Replace all parts which are cracked, show
signs of excessive wear, scoring, or corrosion, or
i . Place the transducer in a 500 oF oven for 5
are damaged beyond minor repair.
minutes. Remove unit from oven and tighten pole
piece assembly securely into the case using a Spanner
a. Remove mild corrosion, minor nicks, or scores
Wrench, Part No. 28024-AE-7, and Holding Fixture,
from steel parts, with crocus cloth, Federal Speci-
Part No. 28024-AE-6.
1-36
