Locking Collar Assembly & Helmet Ring - Kirby Morgan 77 Operation And Maintenance Manual

6.5 Monthly Maintenance
(or between jobs)
(See DiveLab Checklist A2.2)
6.5.1 Locking Collar Assembly & Helmet
Ring
NOTE: By definition "Monthly" is the minimum
recommended maintenance that should be per-
formed at least once a month with the helmet in
continuous use, (used for more than 20 diving
days a month) or at least every two months with
the helmet used less than 10 diving days a month.
Maintenance should also be performed any time the
serviceability of the helmet is in question."
Check the two sealed pull pins to make sure they
operate smoothly and engage the pins on the locking
collar properly. If the sealed pull pins stick or do not
provide adequate tension it is essential to return your
helmet to your dealer or KMDSI for service. Do not
attempt to service these mechanisms by yourself.
WARNING
The sealed pull pins must operate smoothly
with a positive action. If the pins do not
release properly the diver may not be able
to remove the helmet quickly if necessary.
If the pins do not lock with a positive
action the locking collar assembly will
not lock properly and the helmet may
come off the diver's head. If this happens
underwater, drowning could result.
6.5.2 Neck Dam Ring Assembly
Inspect the neck dam carefully. There must be no
holes in the neck dam. If you are using a latex neck
dam, the latex must be firm, not sticky. If there is any
damage to the latex the neck dam must be replaced.
Do not patch a latex neck dam. Apply talcum powder
to the neck dam prior to storage and to prepare it for
the next dive.
Inspect the O-ring on the neck dam ring assembly.
It must be in good condition with no nicks, tears, or
cracking. Replace the O-ring if it shows signs of wear.
Check to see if the neck dam has pulled away from
the neck ring. This requires a close visual inspection.
Check the screws on the ring to ensure they are
properly tightened.
6.5.3 Head Cushion and Chin Cushion
Remove the foam from the head cushion and inspect
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
WARNING
Avoid patching a torn or punctured neck
dam. If the patch comes off underwater
the helmet could flood and/or the demand
regulator assembly may not function
properly. A damaged neck dam should
be replaced.
Check the neck dam for holes.
Inspect the O-ring on the neck dam.
Kirby Morgan 77
®
71