6
Impulse Second Stage Service & Repair Manual
© 1997 U.S. Divers Co., Inc.
Reassembly Procedures
NOTE:
Before performing any reassembly, it is important to
inspect all parts, both new and those that are being reused,
to ensure that every part and component is perfectly clean
and free of any dust, corrosion, or blemishes. Before dress-
ing each O-ring with silicone grease, check to ensure that it
is clean, supple, and free of any blemish.
WARNING:
Use only genuine U.S. Divers parts, subassem-
blies, and components whenever assembling U.S. Divers
products. DO NOT attempt to substitute a U.S. Divers part
with another manufacturer’s, regardless of any similarity in
shape, size, or appearance. Doing so may render the
product unsafe, and could result in serious injury or death.
1.
Install the O-ring(13) onto the vane adjustment switch(14).
2.
Mate the stem of the vane switch into its respective hole in the
box bottom(6), above the outlet boss, and align the mating pin
above the positioning guide (see Fig. 8). When the switch is
correctly aligned, press it down and into place so that it is
properly seated inside the box bottom.
3.
Press the circlip(18) into the recessed ledge in the forks of the
Circlip/ Retaining Ring Tool (P/N 1078-46), with its flat side
facing down and the open end facing out of the tool (see Fig.
9). The spring tension of the tool will hold the circlip in place
while it is being positioned inside the box bottom.
4.
While holding the vane switch in place, set the box bottom on
a flat surface with the open side facing down and the switch at
12 o’clock. Guide the tool holding the circlip into the outlet
boss, with the top surface of the tool held flush against the
inner wall directly behind the vane. Press the circlip evenly
onto the groove of the vane stem until it snaps audibly into
place (see Fig. 10). Remove the tool and examine closely to
ensure that the circlip is seated completely inside the groove.
Remove and reinstall the circlip if necessary.
CAUTION:
It is important to ensure that the vane adjust-
ment switch, O-ring, and circlip are correctly installed in
order to maintain the watertight integrity of the box bottom
assembly. Improper installation may result in flooding of the
second stage.
5.
Install the exhaust valve diaphragm(19) into the box bottom
by gently pulling the stem through the hole in the center of the
support spokes, until the barb has passed through and is
securely seated against the opposite side. Carefully snip off
the excess material of the stem with a small pair of scissors.
6.
Install the exhaust tee(17) onto the box bottom by fitting it
over one upper corner of the seating flange and then stretching
it over the other. Firmly press the lower portion of the tee
onto the flange until it is completely seated.
Fig. 9 - Loading Circlip Tool
Fig. 8 - V.A.S. Alignment
Flat Side Facing Down
Fig. 10 - V.A.S. Circlip Installation
Fig. 11 - Lever & Valve Body Alignment
Positioning
Mark
