PS Magazine - TB 43-PS-594

PS, The Preventative Maintenance Monthly

ISSUE 594

MAY 2002
PS Magazine - TB 43-PS-594 - Page 24 of 33
PS 594
45
Inlet valve:
The inlet valve assembly
must seat completely in the sideport
grooves or the mask won’t seal. If the
inlet valve is properly installed, you
should be able to rotate it easily with
your finger. If it’s difficult to move, try
installing it again.
Disks:
The outlet and inlet valves and
the nosecup all have disks. If any of the
disks are missing, you’ll have trouble
breathing or the eyelenses will fog up.
So make sure all the disks are installed.
If the disks are torn or dirty, 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 usual-
ly just need reseating. Remember, the
nosecup valve disks go inside the nose-
cup, not outside.
PS 594
MAY 02
44
O
ne piece of equipment you want never to fail is your M40 or M42 protective
mask. A mask that can’t do its job leads to a condition called “can’t breathe”. But
just a few quick checks make breathing easy.
Voicemitters:
The No. 1
mistake soldiers make with
their masks is putting the
side voicemitter in back-
wards. That offers you less
protection. The voicemit-
ters’ four bumps should
face out.
Remember,
the
side
voicemitter has a rubber
gasket. If you forget to put
the gasket back in, the
voicemitter won’t have a
good seal. Tighten the side
voicemitter ring with the
D-ring on the carrier strap.
Four bumps
face out?
Don’t forget
gasket
Inlet valve
should fit
in sideport
grooves
Disks missing,
torn, dirty, or
sticking?
Replace or
reseat disk
M40/M42-Series Masks…
you
did
remember to
do your mask
pmcs, didn’t
you, harkins?
[gasp]
[wheeze]
594. 44-47 (C)
3/30/02
12:51 PM
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