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Unloader Valve and Valve Tube
Receiver Tank Safety Valve

TM-5-4310-227-15 Compressor Reciprocating: Air; Gasoline Engine 15 CFM 175 PSI; Receiver Mounted (Champion Pneumatic Model OEG-458-ENG-1) Manual
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TM 5-4310-227-15
(2) Watch the pressure gage to see at
(3) Remove the unloader valve body (11)
what point the unloader valve opens.
from the lower body (9) by unscrew-
The unloader valve is adjusted cor-
ing it.
(4) Push the assembled piston and piston
rectly if it opens when the air pressure
rod (3) down through the unloader
reaches 175 psi.
(3) If the unloader valve opens before
valve body.
(5) R e m o v e the piston (4) and piston
the air pressure reaches 175 psi, turn
the nut (35) clockwise until the un-
packing (5) from the piston rod (3).
(6) Remove the body seat (6) and valve
loader valve is operating correctly.
(4) If the unloader valve opens after the
(8) from the lower body (9).
(7) Remove the gasket (7) from the body
air pressure has gone over 175 psi,
seat.
turn the nut counterclockwise until
the unloader valve is operating cor-
Note. Remove the gasket only if it
needs to be replaced.
rectly.
c. Cleaning, Inspection, and Repair.
(1) Clean all parts with an approved
3-84. Aftercooler Manifold
cleaning solvent and dry throughly.
a. Removal.
(2) Inspect all parts for cracks, breaks,
(1) Remove the unloader valve (para 3-
w e a r , or other damage. Replace a
83).
damaged part.
(2) Remove the aftercooler manifold (30,
d. Reassembly.
fig. 3-30) from the check valve (28).
(1) Install the gasket (7) on the body
(3) Remove the pipe plug from the after-
seat (6).
cooler manifold.
(2) Install the body seat (6) and valve
b. Cleaning and Inspection.
(8) in the lower body (9).
(1) Clean all parts with an approved
(3) Install the piston (4) and piston pack-
cleaning solvent and dry thoroughly.
ing (5) on the piston rod (3).
(2) Inspect all parts for cracks, breaks,
(4) Push the assembled piston and piston
worn threads, rust, or other damage.
r o d (3) up through the unloader
Replace a damaged part.
valve body (11).
c. Installation.
(5) Install the unloader valve body (11)
(1) Install the pipe plug in the aftercool-
on the lower body (9).
er manifold.
(6) I n s t a l l the spring (12) and spring
(2) Install the aftecooler manifold (30)
button (13) on the piston rod (3)
in the check valve (28).
and secure with the nut (1).
(3) Install the unloader valve (para 3-
(7) Install the pipe plug (10) in the low-
83).
er body (9).
e. Installation.
3-85. Check Valve
(1) Install. the pipe nipple (32, fig. 3-
a. Removal.
30) in the unloader valve (34).
(1) Remove the
manifold
aftercooler
(2) Install the unloader valve (34) and
(para 3-84).
pipe nipple (32) on the aftercooler
(2) Remove the check valve (28, fig. 3-
manifold (30).
(3) Install the unloader valve (34) in the
30) from the pipe nipple (27) in the
pipe tee (26) and remove the pipe
bushing (25).
nipple from the check valve. Remove
(4) Connect the sensing tube (31) and
the pipe tee (26) and nipple from the
tighten the compression nuts (29).
air receiver tank.
(5) Install the aftercooler tube (para 3-
b. Cleaning and Inspection.
81).
(1) Clean all parts with an approved
f. Adjustment.
cleaning solvent and dry thoroughly.
(1) Start the air compressor (para 2-26).
3-72






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