Aqua Lung ABS SECOND STAGE Technical Maintenance Manual page 7

ABS Second Stage Technical Maintenance Manual
6. Apply a medium blade screwdriver to the slotted head of
the adjustable crown (21), and turn the crown clockwise to
engage the threads. Continue turning the crown clockwise
to the full extent of its thread engagement, and stop turning
when resistance is felt. Then turn the crown out counter-
clockwise exactly 2 1/2 turns to arrive at its correct
preliminary setting.
7. Stand the inlet fitting (12) vertical on a flat surface with the
sealing edge of the crown (21) facing up inside. Lay the previ-
ously used LP seat (8) inside the inlet fitting, over the sealing
edge of the crown.
NOTE:
It is essential to use a spare LP seat
in order to prevent damage to the new seat
while performing the following steps of the
reassembly procedure.
8. Place the poppet bearing (5) over the pin of the extraction
tool with the square feature facing up. Guide the pin of the
tool into the open end of the valve body (4) and out through
the square hole in its center. While sighting through the top
of the valve body, rotate the tool as needed to align the
square feature of the poppet bearing with the square hole,
and press the tool upward to seat the bearing securely in
place (see Fig. 3). When finished, check to ensure that the
top of the poppet bearing is flush with the top of the valve body.
Fig.3
Poppet Bearing Installation
9. Press the new LP seat (8) into the cavity in the head of the
poppet (7), with the smooth side facing out.
10. Stand the poppet (7) on its head inside the top of the inlet
fitting (12) and on top of the old LP seat. Place the spring (6)
over the poppet shaft.
11. Hold the inlet fitting (12) secure, and mate the valve
body (4) with poppet bearing down over the poppet shaft (7).
Press the valve body downward to compress the spring while
turning it clockwise to engage the threads of the inlet fitting,
and then continue turning it slowly until the threaded portion
of the poppet shaft stands outside the poppet bearing.
12. Hold the valve body assembly (8-15) stationary and
upright with one hand, and slowly unscrew the inlet fitting
(19) counter-clockwise to loosen and remove from beneath
it, while watching to ensure that the lever rises slightly as
the poppet shaft extends from the valve body. Remove and
discard the previously used LP seat from the inlet fitting.
CAUTION: If resistance is felt, immediately stop
and unscrew the valve body from the inlet fitting
to check the alignment of the poppet shaft and
poppet bearing. Excessive force and misalignment
will otherwise result in damage to the poppet
bearing, requiring its replacement.
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