MASK MOUNTED REGULATOR REPAIR
Push gently on the diaphragm or damage to the lever
assembly could affect regulator operation.
3. Thread the shut-off hub into the regulator housing.
4. Fit the large spanner
wrench on the inch-
pound torque wrench
and torque to 10-
15in.lbs.
5. Insert the small diaphragm spring through the center
hole in the shut-off hub so it rests over the center nip-
ple of the diaphragm. This spring has to fit around the
rib on top of the diaphragm.
6. Thread the adjusting screw into the shut-off hub.
7. Adjust the static pressure. (see Static Pressure)
8. Perform the Static Pressure Test and the Flow Test to
check the final assembly.
Removing the Valve Core
Note:
Internal parts of the valve core are not replaceable.
The valve core must be replaced as a complete unit.
However, the screen may be removed and replaced, as
can the O-ring at the swivel block end.
1. Remove the end cap, diaphragm, and spring. (see
Removing the Shut-off Cap, Spring and Stop Spring)
2. Disconnect the unpressurized mask mounted regulator
from the facepiece.
3. Using a 1" open-end
wrench, unthread the
knob securing the hose
to the regulator.
4. Pull the swivel shaft
gently out of the regu-
lator body.
5. Using the O-ring
removal tool, pull the
inlet screen from the
regulator. Inspect the
screen for corrosion,
dirt, or debris. Replace
the screen if necessary.
6. Visually inspect the two O-rings on the inlet swivel
shaft. Replace the O-rings if they are worn or dam-
aged.
Do not press on the lever assembly or unthread the
valve and lever assembly from the valve body. This
could affect operation.
7. To remove the valve
core from the regulator
body, hold the body as
shown. Gently push the
end of the valve core
with your thumbs to
unseat the O-ring and
valve core.
8. Cup one hand under
the body and support
the valve core as it
slides out of the body.
9. Remove and discard the external sleeve O-ring.
4
TAL 4011 (L) Rev. 3 - 817081
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