CHAPTER 3
FIELD MAINTENANCE INSTRUCTIONS-FOURTH ECHELON
Section I. GENERAL
compressor (par. 47). The test stand is hooked up in
19. Special Tools
the following manner.
Mount variable speed drive to
No special tools are required.
However, the
mounting base of test stand. Attach compressor to be
following common tools are required for the disassembly
tested to variable drive with mounting adapter. Connect
and assembly of the compressor group.
a high pressure flexible hose to discharge fitting on
a. Pliers, retaining ring. The pliers are required to
compressor and connect other end to a high pressure
assemble and disassemble the ring on the first stage
tee.
Attach 0-3000 psi gage to high pressure tee.
piston pin assembly (par. 35b and 43i).
Connect a high pressure flexible hose to free end of high
b. Wrench internal socket with 1/4-inch square
pressure tee, then connect other end of hose to manually
drive, 9/i64 inch. The socket wrench is required to apply
adjustable high pressure (O to 300 psi) back pressure
torque to first and third stage head screws (par. 44m
valve. Discharge port of back pressure valve may be
and 46n).
connected with a high pressure flexible hose to a 208 t 3
c. Wrench, internal socket with 1/4-inch square
cu. in. high pressure reservoir, when performing pump
drive, 5/32 inch. The socket wrench is required to
up test. Connect a flex hose with AN818 nut to blowby
assemble and disassemble the gerotor (par. 36d and
fitting located on bottom of compressor adaptor.
42e).
Connect free end of flexible hose to 0 to 1 cfm flowmeter
d. Wrench, internal socket with 1/4-inch square
with vent to atmosphere.
drive, 3/16 inch. The socket wrench is required to apply
Warning: Be extremely careful when fabricating,
torque to second stage head screws (par. 15o) and the
test stand that all components of the test stand are
fourth stage plug screws (par. 46p).
e. Wrench, torque, 1/4,-inch square drive. This
firmly secured to stand to prevent injury to
torque wrench is used with the. 1/4-inch drive socket .
personnel and damage to property. Observe safety
20. Equipment
procedures for working with high pressure
a. Test Stand.
A locally fabricated variable-
pneumatic equipment.
speed-driven test stand, capable of delivering up to 3
b. Ultrasonic Cleaner.
An ultrasonic cleaner
horsepower, and incorporating a flowmeter, tachometer,
using dry-cleaning solvent should be used for cleaning all
high pressure reservoir, timeclock, gage and a mounting
metal parts. However, if the cleaner is not available,
adapter is required for running in the reassembled basic
use a stiff bristle brush and clean all parts thoroughly
with dry-cleaning solvent per Federal Specification P-S-
661.
Section II. WATER SEPARATOR GROUP
21. Description
tion of the unit. The cap incorporates an inlet port, outlet
The water separator group consists of a shell, baffle
port and a port for the installation of the relief valve. The
assembly, cap, relief valve and various fittings and
inlet port, of the cap, is so oriented that it directs the inlet
components to permit proper opera-
air to the
AGO 5548A
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