SECOND STAGE REGULATOR DISASSEMBLY
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. Crack
the bypass valve to release any trapped air.
•If desired, disconnect the intermediate-pressure hose
from the first stage regulator at the hose fitting using a
11/16" open-end wrench. Refer to the INTRODUC-
TION Tab of this Binder for General Notes and
required tools.
Note: Refer to the appropriate illustrated parts lists for the
apparatus being repaired.
REMOVING THE SHUT-OFF CAP, SPRING, AND STOP
SPRING
1. Remove the setscrew
from the regulator
housing. Unthread the
shut-offcap with push
button and remove
spring.
2. Remove the stop spring out of the groove at the bot-
tom of the shut-off base hub. Remove any RTV adhe-
sive from the shut-off base.
3. Turn the shut-off cap so
the threads are pointing
down. Place a small
screwdriver under the
notched end of the spi-
ral retaining ring.
4. Turn and lift the small screwdriver to remove the end
of the spiral retaining ring out of the shut-off cap
groove.
5. Grasp the spiral retaining
ring with your fingers
and pull the spiral
retaining ring out of the
shut-off cap groove.
Discard the spiral
retaining ring. Do not
reuse the spiral retain-
ing ring.
6. Turn the shut-off cap upside down to remove the push
button.
REPLACING THE REGULATOR QUICK-CONNECT O-
RING
1. Insert the O-ring removal tool under the O-ring and
remove it. Be careful not to scratch the O-ring groove.
Note: If an O-ring removal tool is not available, refer to
Lubricating, Cleaning, or Replacing the Release Tab for
easier access to the O-ring.
REMOVING THE SHUT-OFF BASE
1. Fit the large spanner
wrench on the socket
driver. Unscrew the
shut-off base from the
regulator housing.
2. Using the small spanner wrench, remove the thrust
ring.
3. Using the small span-
ner wrench, unscrew
the adjusting screw
from the shut-off base.
Remove the diaphragm
spring. Clean sealant
residue from the parts.
9TAL 502 (L) Rev. 0 - 10064383
