a. Seal port in outlet adapter with an appropriate
b. Remove dehydrator cartridge (14) from housing
pressure plug.
(13).
b. Connect source of clean, dry compressed air or
c. Unscrew outlet adapter (8) from housing (13).
nitrogen at a pressure of 3000 psig to port in inlet cap.
Remove packing (10) and back-up ring (11).
c. Slowly pressurize dehydrator housing to a
d. Unscrew inlet cap (9) from housing (13). Remove
maximum pressure of 3000 psig.
packing (10), back-up ring (11) and spring (12).
4.13.3 CLEANING AND INSPECTING PARTS. Clean and
d. Brush a soap-water solution on all joints and
inspect parts of the dehydrator assembly as follows:
seams of dehydrator housing. Check for air leaks as
evidenced by air bubbles. Maximum allowable leakage
a. Wash all metal parts in dry-cleaning solvent
is two cubic centimeters per hour.
(Federal Specification P-S-661). Dry parts with clean, lint-
e. After completing leakage test, wipe all soap
free cloths. Use filtered compressed air to blow residue
water solution from surface of dehydrator housing.
from all crevices, threads and air passages.
Relieve air pressure, disconnect test equipment and
b. Inspect all parts for obvious damage such as
remove pressure plug from outlet adapter.
stripped threads, cracks and deformation.
f. Remove outlet adapter cap and install dehydrator
c. Examine filter disc for cracks, chipping and other
cartridge as instructed in paragraph 4.13.4, steps e and
damage.
Make sure spring is cylindrical in shape with
4.
ends closed and square.
4.13.6
INSTALLATION. Reinstall the dehydrator
assembly in the cart frame by performing the removal
d. Dehydrator cartridge is expendable.
Do not
procedure (paragraph 4.13.1) in reverse sequence.
attempt to repair or reactivate a used cartridge.
Make sure all pneumatic connections are air tight. Safety
NOTE
wire components in accordance with the original
Refer to parts list for Figure 5-10 for part
equipment configuration.
numbers and contents of Repair Kit
4.14 BASIC AIR COMPRESSOR
available for use on the dehydrator
assembly.
4.14.1
REMOVAL.
To remove the basic air
compressor:
4.13.4
REASSEMBLY (See Figure 5-10.)
a. Remove housing assembly from compressor end
a. Install back-up ring (11) and packing (10) in groove
of cart (see paragraph 4.17.1).
at inlet end of housing (13). Screw inlet cap (9) on housing
and tighten with a torque of 30 pound-feet.
b. (See Figure 5-3.) Disconnect first-stage-to filter
connecting tube (17) from compressor first stage outlet
b. Install back-up ring (11) and packing (10) in internal
the. Disconnect aftercooler-to-separator connecting tube
groove at outlet end of housing (13). Screw outlet adapter
(22) from reducer (23) installed in aftercooler elbow (26).
(8) on housing and tighten with a torque of 30 pound-feet.
c. (See Figure 5-12.) Remove screws (5) and lock
c. Drop spring (12) into housing (13).
washers (6) attaching nameplate (4) to compressor fan
d. Install back-up ring (6) and packing (5) in lower
guard. Remove nameplate. Unscrew draw bolt (11)
groove of outlet adapter cap (4). Make sure back-up ring
which extends through hub of compressor fan.
does not overlap recessed section of outlet adapter cap
d. (See Figure 5-11.) Remove screws (4)and lock
that mates with outlet adapter (8). Screw cap into outlet
washers (5) attaching air compressor (3) to gasoline
adapter and tighten with a torque of 10 pound feet. Test
engine (20). Carefully pull compressor free of engine
reassembled housing for leakage in accordance with
crankshaft.
instructions in paragraph 4.13.15.
NOTE
e. Remove desiccant indicator assembly from each
It may be necessary to remove the
end of replacement dehydrator cartridge (14). Make
drain cock and street elbows (1
certain preformed packing and lock ring are installed in
and 2, Figure 5-11) before the air
grooves at outlet end of cartridge. Install cartridge in
compressor
can
be
moved
housing (13) in accordance with instructions stamped on
sufficiently to clear the crankshaft.
cartridge body.
f. Screw outlet adapter cap (4) into outlet adapter (8) and
4.14.2
DISASSEMBLY. Complete disassembly of
tighten with a torque of 10 pound-feet.
the basic air compressor is seldom required. Therefore,
4.13.5
LEAKAGE TEST.
Test there assembled
the following paragraphs contain instructions for
dehydrator housing for leakage before installing the
removing and replacing those sections for which
cartridge. Proceed as follows:
replacement-
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