KMB 18 & 28 MANUAL
page 41
Document # 010518001 © Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved.
If a new hood is being installed, retighten the
band screws (15) after 24 hours to adjust for
compression of the rubber.
5.5 MONTHLY MAINTENANCE
(OR BETWEEN JOBS)
5.5.1 Communications Inspection (13)
1) Visually inspect the earphones (10,11), micro-
phone (12), wires, lugs, and communications
posts (73). Test each component for proper
operation. Connect to the deck amplifier and talk
back and forth. Replace any weak earphone or
microphone.
The microphone (12) is of a special design for
underwater use. It has a felt backing that will
absorb salt water to help protect the microphone.
The microphone should be removed for periodic
cleaning. If salt has accumulated on the felt it
should be dipped in fresh water to remove the salt.
2) Open the earphone rubber covers and remove
the protectors. Allow to dry thoroughly. Replace
defective earphones. See Section 6.9.3.
5.5.2 Lubricate Nose Block O-Rings (32)
Tools Required:
7/16 inch Open End wrench
1) Unscrew the nose block device packing nut
(33) and lubricate the two O-rings (32) and main
shaft (3). Retighten the nut just to the point where
the nose block device (3) will still slide, but it
requires a firm push or pull.
2) Test the shaft (3) to ensure that it will still slide
freely at this time. If it does not, loosen or tighten
the nut (33) just enough to permit the shaft (3) to
slide properly. A bent nose block device shaft
will prevent proper function and could cut the o-
ring causing a leak.
The easiest way to install the hood (2) is to slide
it on the mask frame (17) and position the bands
(16, 68). Start tightening the screws (15) that join
the bands slowly turning each a few turns and
then the other, bringing the bands together uni-
formly. Pull the edge of the hood out from under
the bands until it protrudes at least 1/4 to 1/2 inch
(6.0-12.0 mm). Tighten the bands a bit more and
check the hood again. Repeat this procedure until
the screws (15) are tightened to 26 inch pounds
(28 kg cm) of torque. Test the installation by
pulling on the hood and trying to separate it from
the mask.
WARNING: Always ensure that the
bands that hold the hood in position are
properly tightened prior to diving. If the
bands are not tight or the hood is not
properly captured the mask could leak or
could separate from the hood. This could
lead to drowning.
Fig. 5.7 The hood should protrude a minimum from 1/4 to
1/2 inch from under the bands.
