Kirby 77 User Manual download pdf (Page 3)

Kirby Morgan 77

Neck Dam components.

dam opening so that the two “edges” of the neck

dam are parallel. The neck dam must be under slight

tension but must not be stretched beyond its normal

length. Trim the neck dam with the largest, sharpest

scissors available, in order to make as few cuts as

possible. There must be no jagged edges on the neck

dam or it may tear.

Trim only 1/4 inch off the neck dam at a time. When

you are done, the neck dam must be just tight enough

KMDSI must have your current address to

ensure that you receive all safety notices

and other important information concern-

ing the helmet. Please notify KMDSI of

any change of address.

WARNING

3.4 Initial Adjustments to

Your Helmet

Before using the helmet for the ﬁrst time, it must be

checked and adjusted for proper ﬁt. There are several

adjustments that must be made to provide a more

comfortable ﬁt when wearing the helmet.

3.4.1 Head Cushion

The ﬁt of the helmet is primarily determined by the

layers of open cell foam that ﬁll the head cushion

bag.

The center top/rear foam is very dense to reduce

compression and spring-back. This reduces the ten-

dency of the helmet to ride up when underwater. Do

not replace this rigid foam with a soft foam. A softer

foam is used on the sides and around the bottom of

the head cushion.

The diver’s head can be moved forward into the oral

nasal mask by adding layers of additional foam at the

rear of the head cushion. Do not add to much foam to

the rear of the head cushion, as this may position the

diver’s chin too far into the oral/nasal mask and create

an uncomfortable ﬁt. The diver’s head can be moved

up or down in the helmet by decreasing or increasing

the foam pads at the top of the head cushion.

Usually, a diver with a small head will use all the foam

that comes with a new hat. A diver with a larger head

will need to remove a layer of foam in the center top

and back of the head cushion. The foam may be cut

with scissors to provide a better ﬁt, or more foam can

be added to give a tighter ﬁt.

The chin cushion can also be adjusted if necessary.

3.4.2 Trimming the Neck Dam

If your helmet is new, or any time you replace the

neck dam, it must be adjusted to ﬁt you. New neck

dams are cone shaped and will probably be too tight

if not properly trimmed.

The neck dam must be trimmed to ﬁt your neck. To

trim the neck dam, have your tender hold the neck

Never dive with a neck dam that is too

tight. A neck dam that is too tight could

cause the diver to pass out due to pres-

sure on the carotid artery in the neck.

This could lead to severe personal injury

or death.

WARNING

The head cushion should be adjusted for best ﬁt.

O-ring

Split

Ring

Neck

dam

Stepped

Ring

Pull

Strap

Screw

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Kirby 77 User Manual Page 3

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