MK17 revision may 2005 5 / 5
6. Insert the assembled HP-poppet inside the assembled balance chamber.
7. Insert the whole system inside the 1
st
stage and screw snug with the 6 mm Allen key.
Warning ! : Do not over torque.
8. Place the diaphragm pin in the HP-poppet followed by the metal disc insert and the
disc.
At this stage it is possible to check the perfect seal between the HP seat and
orifice.
9. Remove the field handle tool from the HP-port, reassemble the HP-plugs, slightly
grease the o-rings and threads and replace them in the body. Do not over torque (4
to 5 Newton meter maximum)
10. Connect the 1
st
stage to a tank, filled to the working pressure of the 1
st
stage and
carefully open the tank valve.
Once pressurised, there should be no leak. A slight push with the thumb on the
disk opens the system and air will flow. It is advisable to cycle the system a
few times to check the air lock. Purge the system before removing the 1
st
stage
from the tank.
11. Place the diaphragm in position, (WARNING: the diaphragm should always be dry,
no grease should be used for assembly) then the 2 diaphragm rings.
12. Place and centre the diaphragm disc on the diaphragm.
13. Lubricate slightly the threads before screwing the dry ambient chamber by hand in
the body.
14. Fix the field handle tool again in one of the HP ports and secure the tool in a vice.
Use the 32 mm spanner or adjustable spanner and tighten snug the dry ambient
chamber on the body
WARNING: If the diaphragm is not properly secured by a firm tightening, there
is a risk of the diaphragm coming off its groove resulting in a heavy air leak
that could endanger the diver's life.
15. Slightly grease the threads of the spring adjustment screw and the spring groove be-
fore placing the washer.
16. Place the spring in the cavity of the diaphragm disk.
17. Screw the spring adjustment screw in the dry ambient chamber by about 2 / 3 turns.
18. Reassemble all the plugs and / or the hoses after having slightly greased the threads.
Do not over torque (4 to 5 Newton meter maximum )
19. Place back the 2 bumper caps.
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