Impulse Second Stage Service & Repair Manual
5
© 1997 U.S. Divers Co., Inc.
it is not damaged (bent) or corroded. If any signs of damage
or corrosion are found, discard the spring and do not reuse.
20. Discard the poppet/ LP seat assembly, and do not attempt to
reuse, regardless of its condition.
21. While holding the valve body secure, press against both ends
of the deflector clip(25) with thumb and forefinger to remove,
and set it aside.
22. While holding the valve body secure, apply a medium blade
screwdriver to the slotted head of the adjustable crown(21),
and turn the crown counter-clockwise to disengage its threads.
NOTE:
Because the crown is O-ring sealed, it will not freely
exit the valve body after it has been unthreaded. The follow-
ing step must be performed correctly in order to remove the
crown without damaging its delicate sealing surface.
23. When the crown has been unthreaded from the valve body,
carefully insert the pin of the Seat Extraction Tool through the
opposite end of the valve body and through the opening in the
center of the crown. Gently press the crown out (see Fig. 6).
Remove and discard the O-ring(20).
24. Closely examine the crown with the use of magnifier, check-
ing for any scoring, nicks, or other damage to the polished
sealing surface. If damage is found, discard the crown, and do
not attempt to reuse. If it is in reusable condition, set it aside
on a soft surface to prevent damage to the sealing edge.
25. Using a blunt probe, turn the circlip(18) which retains the
vane adjustment switch(14) as needed to ensure that the open
ends face towards the outlet boss. Place the box bottom down
on a flat, padded surface, so that the outlet boss and exhaust
tee face up.
26. While holding the box bottom secure, place the tines of the
Circlip/ Retaining Ring Tool (P/N 1078-46) squarely against
the ends of the circlip (see Fig. 7). Gently press the circlip
straight off the vane adjustment switch, and set it aside.
27. Pull the vane adjustment switch straight up and out of the
outlet boss of the box bottom. Remove and discard the O-
ring(13), and set the switch aside.
28. While holding the box bottom secure, remove the exhaust tee
by firmly pulling one side off and then the other.
CAUTION:
Do not use a tool to remove the exhaust tee.
Doing so may cause serious damage to the seating flange,
requiring replacement of the box bottom.
29. Remove the exhaust valve diaphragm(9) from the box bottom
and discard.
This concludes the disassembly of the Impulse second
stage. Refer directly to Procedure A and Table A, titled
Cleaning & Lubrication, before proceeding to the Reas-
sembly Procedures.
Fig. 7 - V.A.S. Circlip Removal
Fig. 6 - Crown Removal
Fig. 5 - Lever Inspection
