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Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
end wrench to remove the inlet fitting with orifice from
the second stage. Be careful to protect the exposed
sealing edge of the orifice.
d. Fasten the Poppet Drive Tool (PN 20-640-100) onto the
second stage inlet, and engage the driver with the
head of the poppet.
e. While holding the locknut secure with the Poppet Tool
Wrench, turn the knob of the Poppet Drive Tool clock-
wise a small fraction of a turn. Do not over-adjust,
since it is important to tighten the nut onto the poppet
only as far as is necessary to remove the lever slack.
f. Remove the Poppet Drive Tool and Wrench, and rein-
stall the inlet fitting with orifice into the second stage
while holding the lever depressed. Tighten finger snug.
g. Repeat the above steps until lever slack is eliminated.
h. Reinstall the diaphragm, diaphragm cover, and cover
ring. Reconnect the LP hose, tightening by hand until
snug, and repressurize the regulator with a filtered gas
supply of 2,500-3,000 psi to check for leakage.
CAUTION: Over-adjustment of the locknut can cause ex-
cessive spring load in the second stage valve, and may im-
pair the regulator’s performance. If leakage returns after
following the above steps, disassemble the second stage
valve assembly and repeat the above procedure following a
close inspection of the orifice and LP seat and reassembly.
7. When the second stage is properly adjusted with no leaks
or lever slack, depressurize and purge the system to dis-
connect the LP hose.
8. If the inlet coupling was removed, apply a torque wrench
with w" socket to tighten it to a torque measurement of 90
inch-lbs (±5).
9. Reconnect the LP hose to the inlet coupling, and apply a
torque wrench with n" crow-foot to tighten the LP hose
fitting to a torque measurement of 55 inch-lbs (±5).
Subjective Breathing Test
1. Connect the regulator to a cylinder containing 2,500 –
3,000 psi, and open the valve to pressurize the system.
2. Fully depress the second stage purge to ensure that an
adequate volume of air flows through the mouthpiece,
sufficient to clear the second stage. Then, breathe several
times from the second stage.