PS Magazine - TB 43-PS-634
PS, The Preventative Maintenance Monthly
ISSUE 634
SEPTEMBER 2005
PS 634
SEP 05
55
M40-Series, M42-Series Masks…
Breathe
In,
Breathe
Out
Disks:
The outlet and inlet
valve have one disk each. The
nosecup valve has two disks. The
four disks disappear easily. If any
of the disks are missing, you'll
have leaks or the eyelenses will
fog up. When you do PMCS,
make sure all four disks are
installed.
If any of the disks are torn or
dirty and can’t be cleaned, replace
them. Rotate the disks with your
finger to make sure they're not
sticking. If the inlet valve disk
sticks, replace it. Sticking nosecup
and outlet disks usually just need
reseating. Remember that the two
nosecup valve disks go inside the
nosecup, not outside.
I
f you can't breathe in and out of your M40- or M42-series mask, it's not exactly
going to be helpful protecting you against chemical threats. That's why it's impor-
tant to pay attention to your mask's valves. If they don't work, you don't breathe. So
take a few deep breaths and memorize these PM points:
Outlet valve cover:
Take it off
and check for dirt. Don't forget to
check under the disk. Wipe out any
dirt with a clean, lint-free cloth.
Make sure the valve cover and disk
are not damaged. If the outlet valve
disk is damaged, your mask won't
have a good seal. In the field, check
the cover for looseness.
Take it easy pulling off the cover.
If you jerk it, the cover can tear
where its holes fit over the hooks.
Work the cover off and on the
hooks. If the cover's holes have
become so big the cover doesn't fit
tightly, tell your NBC NCO. He
may need to replace the cover
before it comes off and disappears.
Canister:
It's OK for
the canister to have dents
as long as they're no
deeper than 1/4 inch. If
they're deeper or cross a
seam or threads, it's time
for a new canister.
Clean under
outlet valve
cover with
clean cloth
Cover holes
too big?
Get cover
replaced
Dents deeper than 1/4 inch? Get a new canister
having a
little
trouble
breathing?
maybe you should’ve
paid a little more
attention to your
mask’s valves.
I think this pm
will be a breath
of fresh air for
both of you.
but you’re
still
having
trouble
breathing!
{henh}
{ah-
heh-hhh}
uhh-
uhh—
Disks missing, torn,
dirty, or sticking?
Replace them
Check for
all 4 disks
634.54-55(C).qxd
7/29/05
1:57 PM
Page 1
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