Inspection Of Demand Regulator Parts - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

KMB 18 & 28 MANUAL
Fig. 6.60 Separating the adjustment knob from the stem.
3) Adjustment knob removal is started by un-
screwing the adjustment knob (47) until it stops.
4) The packing nut (46) is now exposed enough to
use a wrench on it for removal. As the nut (46) is
backed off, unscrew the knob (47), also.
5) The O-ring (45) and washer (44) remain on the
shaft (43).
6) If the washer and O-ring need to be replaced,
place the adjustment knob (47) on a block of
wood and drive the retaining pin (48) out with the
3/32" punch. (see section 5.5.5.1 #3)
7) Tilt the Band Mask so that the spacer (42),
spring set (41), and piston (40) fall out of the
adjustment shaft tube.
8) If not already done, remove the hose assembly
(117a) or bent tube assembly (117b), as per
Section 6.8.
9) Depress the roller lever (55) while unscrew-
ing the inlet nipple (61a/b) so as not to scar the
seat. Remove the inlet nipple (61a/b) from the
regulator body (39).
10) Inside the regulator body (39), remove the nut
(53) from the inlet valve (59). The inlet valve (59)
must be held to prevent rotation when the nut (53)
is being unscrewed. The castle wrench may be
used to hold the inlet valve while the nut is
unscrewed. Insert the castle wrench into the inlet
nipple and press it onto the inlet valve. Also, the
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© Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 010518001
inlet valve holder tool can be used to hold the inlet
valve by inserting it through the balance hole in
the inlet tube and wedging it against the inlet
valve stem. These tools are included in the KMDSI
Tool Kit, KMDSI Part #525-620.
11) Remove the nut (53) completely. The socket
wrench, KMDSI Part #525-612 can be inserted
into the adjustment tube for removal of the nut
(53).
12) Tilt the regulator and drop out the inlet valve
(59) spring (58), and washer (57).
13) The spacer (54), lever (55), and washer (56)
will now fall out of the regulator body (39). The
spacer 42, Spring set (41) and piston (40), can be
removed from the opposite side of the regulator.
6.14.4 Inspection of Demand Regulator
(63a/b) Parts
After the regulator has been disassembled, care-
fully clean and inspect all parts. If parts show
signs of wear or damage they must be replaced,
even if it is prior to the recommended replace-
ment interval.
1) Inlet valve (59): Check for rough surface, cuts,
and deep depressions. Check the knife edge of the
inlet nipple seat (61 a/b) for nicks, dents, or flat
spots. Use your fingernail to feel for nicks. Re-
place the inlet valve and/or inlet nipple if damage
is found.
2) Diaphragm (52): Check to determine if rubber
has separated from the metal part. Inspect for
cracks, pin holes, and pinching of outer edges.
3) O-rings (45, 60, 7): Check for irregularities in
the rubber. Check for cracking.
4) Exhaust valve (62): Be sure there is no curling
or deformation and that the rubber is in good
shape.
5) Inspect the whisker. Replace the whisker (35)
if it shows wear or aging. Replace the whisker if
it allows bubbles to interfere with visibility.