O-Ring Seal Replacement - Kirby Morgan 77 Operation And Maintenance Manual

8.9 O-Ring Seal Replacement

The o-ring on the neck dam ring assembly must be
replaced annually, or whenever it shows signs of
wear. The o-ring makes the seal between the hel-
met ring on the base of the helmet and the neck dam
ring assembly.
To replace the o-ring, simply stretch it over the bot-
tom of the sides of the neck dam ring assembly. The
o-ring must be lubricated with a light coating of
silicone grease before each diving day.
Lubricate the o-ring with a light coating of
silicone grease before each diving day.
WARNING
The o-ring on the neck dam ring of the
Kirby Morgan helmets is made from a
special compound and has unique di-
mensions. It is a softer durometer o-ring
than is commonly available. There are
no equivalent o-rings manufactured by
other vendors. This o-ring must be re-
placed with a KMDSI o-ring. Failure to do
so could lead to seal failure and helmet
flooding. This could lead to drowning.
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
8.10 Helmet Ring
8.10.1 Helmet Ring Repairs
The metal ring on the base of the helmet is part of
the helmet shell casting. If the ring is damaged, such
as damage to the sealing surface, or the ring is bent,
the helmet must be returned to KMDSI through
your authorized dealer for repair or replacement.
WARNING
The sealed pull pins must operate prop-
erly. If they do not lock properly the hel-
met could come off the diver underwater
and drowning could result. If they do not
release when needed, they could make
it impossible to remove the helmet in an
emergency situation. Do not use the hel-
met unless the pins are operating cor-
rectly.
8.11 Sealed Pull Pins
The sealed pull pins that lock the helmet on the div-
er cannot be serviced in the field. If these pins do
not work properly the pins must be returned to an
authorized dealer for replacement.
KMDSI recommends that these pins be serviced an-
nually. Your KMDSI dealer can provide you with
either new pins (Part # 505-110) or factory refur-
bished ones (Part # 505-115). Your old pins can also
be refurbished.
Refurbished pins are hand engraved with a "S/R" on
the body. Refurbished pins can only be made avail-
able if serviceable used pins are returned to the deal-
er and forwarded to KMDSI.
8.11.1 Removal of Sealed Pull Pins
Tools Required:
7/64 Hex Key on Torque Screwdriver
1) Unscrew the hex head screws from the helmet
ring on the base of the helmet.
2) Remove the sealed pull pins by pulling them out
of the helmet ring.
3) Return the pins to your authorized dealer for re-
placement.
8.11.2 Replacement of Sealed Pull Pins
1) Insert the pin(s) into the helmet ring on the base
of the helmet. The cam angle must be correct for the
pins to work.
Kirby Morgan 77
®
141