Dive Gear Express XTRA Second Stage, Service Manual

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6. Second Stage Testing and Adjustment
(1) Second stage testing and adjustment can be accomplished by using a regulated supply or any cylinder of
air. There is no required supply pressure due to the second stage being supplied by a first stage delivering air
at the Intermediate Pressure.
(2) Using a properly tuned first stage, connect the second stage to a low pressure hose with the In­Line
Adjustment tool. Slowly pressurize the system with the purge button slightly depressed. Once the second
stage starts to deliver air, release the purge button. It should not continue to flow. If it does, depressurize
the system and adjust the orifice using the In­Line tool. Turn the orifice clockwise one­half turn to start. Re­
test. Depending on where the orifice was initially set, it may be necessary to do this several times.
(3) If the second stage does not flow on the initial pressurization, attempt several normal breaths from it. If
the breaths require significant effort, depressurize the system and with the purge button depressed turn the
orifice counter­clockwise one­half turn and re­test. As with the clockwise adjustment, this may need to be
done several times.
(4) Once the second stage begins to deliver air at an acceptable level, it can be fine­tuned with the In­Line
tool. While inhaling through the second stage, turn the In­Line tool adjustment knob slightly in the required
direction.
Caution Note:
To avoid excessive wear and cutting of the low pressure seat, only turn the Orifice using
the In­Line tool with the purge button depressed by inhaling or by manually pressing it
while making the adjustment.