Aqua Lung EA-4500 LW Technical Manual page 17

6. Install o-ring (57) on the valve seat (56). Install the valve
seat into the smaller diameter bore of the inlet fitting (55).
Using a 5mm hex bit socket and flex wrench turn the valve
seat counter-clockwise so that it retracts into the inlet fitting
until it stops.
NOTE: The valve seat is a reverse thread into the
inlet fitting.
7. Install o-ring (19) onto
the outside of the smaller
diameter bore of the inlet
fitting (55).
8. Insert the threaded end
of the spindle body (49) into
the inlet fitting hole of the box
bottom (59). Ensure the small
center hole in the spindle body
is facing the diaphragm (47).
CAUTION: DO NOT use the lever to insert the spindle
body into the box bottom, this will bend the lever.
9. Screw the fine threaded end of the inlet fitting (55) into
spindle body (49) until the notches on the inlet fitting and
box bottom (59) are aligned.
10. Align the notches of the locking slide ring (58) to the
notches on the inlet fitting (55) and box bottom (59). Use the
palm of your hand to carefully push the locking slide ring all
the way into place until it clicks.
11. Insert the 5mm hex bit socket and flex wrench into the
open end of the inlet fitting (55). Hold the box bottom (59) at
eye level and turn the valve seat (56) clockwise until the lever
(48) drops just below the rim of the box bottom. Check by
gently pushing down and releasing the lever, it should return
to its set position. If it sticks then the lever is not squarely
seated, positioned correctly or is bent.
CAUTION: Ensure the lever moves freely in the box
bottom and does not stick.
CAUTION: DO NOT adjust the lever beyond the
recommended height. Screwing the valve seat
in too far while adjusting the lever can result in
damage to the MP seat. If damaged, the part will
require replacement.
12. Place the diaphragm (47) into the box bottom (59), making
sure the edges are seated below the threads inside the box
bottom. Install the front cover (46) over the diaphragm making
sure the front cover slots are positioned horizontally.
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