Adjusting The Neck Pad - Kirby Morgan 37 Operation And Maintenance Manual

Trimming the neck dam.
Trim only 1/4 inch off the neck dam at a time. When
you are done, the neck dam must be just tight enough
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.
Teflon
Washer
Washer
Hinge bolt
© ⅯⅯⅩⅢ Kirby Morgan Dive Systems, Inc. All rights reserved. Document #130108002
Washer
®
Neck pad
Locking Collar components.
As the neoprene neck dam ages, it will become looser,
due to a natural breakdown of the cells. This is par-
ticularly 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.
B WARNING
The O-ring on the neck dam ring as-
sembly must be in place and in good
condition. It must be properly lubri-
cated for smooth operation. Without a
proper functioning O-ring the helmet
will leak and possibly flood. Drowning
could result.

3.4.3 Adjusting the Neck Pad

Another component that controls the fit of the KM
37 and 57 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 mount nuts lock
the neck pad plate to the locking collar. Loosening
these screws from the mount nuts allows the neck pad
to be adjusted.
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
Nut
Adjustment nut
Locking collar
T-washer
Kirby Morgan 37 & 57
®
Washer
Screw
33