Aqua Lung EA-4500 LW Technical Manual page 11

NOTE: Before continuing, closely examine the back-up ring.
You will note that it has a flat side and a concave side. For
correct assembly, the concave side should be against the
o-ring, as shown in the picture below.
5. In the following order,
place a new Teflon washer
(18), brass washer (20),
o-ring (21) and back-up ring
(22) onto the stem (17).
6. Using the squared end of the stem (17), screw the seat disc &
retainer (16) into the port opposite the safety plug assembly (35)
on the HP module body (13). Leaving the stem in position, place
the handwheel (26) over the stem and tighten the seat disc &
retainer until finger-tight. Remove the handwheel from the stem.
NOTE: DO NOT apply any type of lubricant to the
seat & disc retainer prior to installation.
7. Install o-ring (19) into the groove located above the threads
on the bonnet (23). Lubricate the bonnet threads, then pass
the bonnet over the stem and thread it into the HP module
body (13) until hand-tight.
8. Attach a 3/4" socket to a
inch pound torque wrench
and torque the bonnet to a
value of 90 in lb (10.2 Nm).
O-ring
Back-up ring
9. Place the nylon washer
(25) over the stem (17), so it
sits on top of the bonnet (23).
Face the round edge on the
indicator ring (24) outward and
thread the indicator ring onto
the bonnet until it bottoms out.
10. When the indicator ring
(24) bottoms out, turn it
slightly counter-clockwise
so the corners of the square
shaft of the stem (17) point
towards the centers of the
square cut outs of the indi-
cator ring. Turn an additional
90° counter-clockwise.
11. Place the handwheel (26) over the indicator ring (24).
Place the spring (27) into the handwheel, followed by the
washer (28). Using the notched end of the 5 in 1 tool, screw
the handwheel retainer (29) onto the end of the stem (17) until
it will not turn any further.
CAUTION: If resistance is felt while screwing the
handwheel retainer onto the stem, stop and start
over to avoid cross threading.
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