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6
the pin has exited, grasp the free end with pliers and pull to
remove it completely. Examine the condition of the pin, and
discard if it is found to be bent or damaged.
8.
While holding the second stage secure, firmly grasp the
adjustment knob and pull it straight off the outer shaft of the
adjustment screw(28). Closely examine the knob to ensure
that no signs of cracking or other damage are present, and set
it aside.
9.
Carefully apply either a 2" box wrench or socket with hand
driver to the cap nut(31) and turn counter-clockwise to disen-
gage from the threads of the valve body. When the cap nut is
completely loosened, grasp the stem of the adjustment screw
firmly between thumb and forefinger, and pull outward to
remove the cap nut, adjustment screw and lever retaining
sleeve(27).
NOTE: If the adjustment screw and retaining sleeve do not
freely exit the valve body, this indicates that the retaining
sleeve is an earlier revision part - Revision A - and should be
replaced with the current version - Revision B. Please
determine this, and refer to the appropriate procedure for
disassembly in the following instructions.
VALVE DISASSEMBLY PROCEDURE - REVISION A
A10. Pull the cap nut off the stem of the adjustment screw and
examine closely to ensure that no signs of cracking or other
damage are present. If damage is found, discard the cap nut
and replace with new.
A11. Turn the adjustment screw clockwise (left hand thread) by
hand to loosen and remove from the retaining sleeve inside
the valve body. Remove and discard the O-ring(29), and set
the adjustment screw aside.
A12. Apply a medium blade screwdriver to the slotted head of the
adjustable crown(12), and turn the crown in clockwise to the
full extent of its thread engagement until resistance is felt.
A13. Firmly grasp the lever between thumb and forefinger and
pull straight out of the valve body to remove.
A14. Apply w" open-end wrench to the hex nut(13) and turn it
counter-clockwise to loosen and remove.
A15. While holding the box bottom(14) secure, grasp the valve
body between thumb and forefinger, and press firmly against
the inlet end of the valve body to remove it from the oppo-
site side of the box bottom. Remove and discard the O-
ring(30), and set the box bottom aside.
A16. Examine the adjustment end of the valve body to locate the
recessed head of the pin(22) which holds the retaining sleeve
in place (see Fig. 2a). Turn the valve body so that the head
(larger end) of the pin is facing straight down, and press the
retaining sleeve inward. This will allow the pin to easily fall
© 1997 U.S. Divers Co., Inc.
Micra ADJ Second Stage Service & Repair Manual
Fig. 2a - Recessed Pin (Rev. A)
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