MASK MOUNTED REGULATOR REPAIR
MASK MOUNTED (SECOND STAGE) REGULATOR
REPAIR
All repair procedures assume that the regulator is disas-
sembled from the apparatus and facepiece. To do this:
•
Be sure the cylinder valve is completely closed.
•
Disconnect the regulator from the facepiece.
•
Be sure nothing is blocking the regulator outlet. Allow
any trapped pressure to bleed from the apparatus.
•
If desired, disconnect the intermediate pressure hose
from the first stage regulator.
Note:
Use only specified thread sealants in their specified
locations. Use of sealants other than the ones specified
may damage MMR (Second Stage) components.
Removing the Shut-Off Cap, Spring, and Stop Spring
1. Remove the setscrew
from the regulator
housing.
2. Unthread the shut-off cap and remove the button and
spring.
3. Pull the stop spring out
of the groove at the
bottom of the shut-off
hub.
4. Remove any RTV Adhesive from the shut-off hub.
5. Fit the large spanner
wrench on the socket
driver. Unthread the
shut-off hub from the
regulator housing.
6. Using the small span-
ner wrench, unthread
the adjusting screw
from the shut-off hub.
7. Remove the diaphragm spring.
8. Clean sealant residue from parts.
Note:
Use extreme care when removing the diaphragm.
Do not bend, twist, or distort the lever assembly. Do not
touch the exposed lever assembly after removing the
diaphragm.
9. Lift the diaphragm and
spacer ring from the
housing.
Note:
If the regulator diaphragm is torn or has any visible
damage, it must be replaced.
Installing a New Diaphragm or Spring
1. Lay the diaphragm on
a flat, clean surface
and place the spacer
ring into the diaphragm's
outer rim. The flange
side must be "up."
2. Install this assembly
into the regulator hous-
ing by pushing gently
on the spacer ring.
3
TAL 4011 (L) Rev. 3 - 817081
