Kirby Morgan 77 - Manual (Page 4)

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© Copyright 1970-2008 Kirby Morgan Dive Systems, Inc. All rights reserved. Document #080626002
Kirby Morgan 77
so that it does not leak. This may feel a bit snug out of
the water, but should be comfortable underwater.
If you have a neoprene neck dam, it may also need to
be stretched for it to fit properly. Trim the neck dam
until it is still snug, then stretch it by sliding it over
a scuba tank and allowing it to sit overnight. If you
still cannot get the proper fit by stretching the neck
dam, it must be trimmed further. Do not trim more
than 1/4 inch at a time.
3.4.3 Adjusting the Neck Pad
Another component that controls the fit of the Kirby
Morgan helmet is the adjustable neck pad. The neck
pad, which is mounted on the locking collar, slides
back and forth along the locking collar body for
adjustment to fit different divers. Two screws and
adjustment nuts lock the neck pad plate to the locking
collar. Loosening these screws from the mount nuts
allows the neck pad to be adjusted.
Trimming the
neck dam.
As the neoprene
neck dam ages, it will become looser, due to a natural
breakdown of the cells. This is particularly true if
the helmet is locked in and out of a bell or saturation
system. As the neck dam becomes worn it will need
replacement to ensure that it seals properly.
Avoid trimming neoprene neck dams too
much. Neoprene neck dams will loosen
over time as they are used and the cells of
the foam neoprene break down. If you trim
the neck dam too much it will be too loose
and will leak. Trim the neck dam until it is
snug, then stretch it before use.
CAUTION
The following procedure requires a diver and tender.
You do not need to have the air on to the helmet if
you do not use the neck dam ring assembly. If the
neck dam assembly is used, the diver must have air
to the helmet to breathe.
With the helmet face down on a suitable surface, pull
and turn each of the sealed pull pins until they are
locked open. Swing the locking collar/neck pad as-
Hinge bolt
Nut
Locking collar
Neck pad
Adjustment nut
Washer
Screw
Washer
T-washer
Teflon
Washer
Washer
Locking Collar components.