PS Magazine - TB 43-PS-705

PS, The Preventative Maintenance Monthly

ISSUE 705

AUGUST 2011
PS Magazine - TB 43-PS-705 - Page 22 of 33
40
PS 705
AUG 11
41
PS 705
AUG 11
Dear Half-Mast,
In PS 686 (Jan 10), you said not to use cherry juice in the Fox’s
hydraulic system, but instead to use H540 hydraulic fluid. And if H540
isn’t available, substitute AW46. Neither has an NSN.
I have these questions:
•±
Are H540 and AW46 still unavailable in the supply system?
•±
We have found vendors for AW46, but we are unsure their product meets the
Fox requirements. How can we be sure?
•±
When you use a different hydraulic fluid in the Fox, should you first purge the
system to get rid of the old fluid?
N.C.
Dear N.C.,
Excellent questions!
H540 and AW46 are still unavailable in the Army supply system. But they can
be purchased through your Fox’s mobile backup team (MBT), which should be a
part of every Fox unit. They are the contractors that support the Foxes locally. If
you have trouble locating your MBT, contact Henry St. Pierre, (410) 436-5527, or
email:
henry.stpierre@us.army.mil
Since you will be getting hydraulic ±uid through your MBT, you won’t need to
worry if it’s the right kind.
Do not mix hydraulic fuids.
When different kinds of ±uids are mixed, that hurts
the ±uid’s effectiveness and can lead to damage of vital parts. If you’re changing
kinds of ±uid, ²rst purge the old ±uid from the hydraulic system.
Dear Editor,
In my work with the MAIT at Camp Casey, Korea, I often run into M40/
M42 masks in which the nosecup has pulled away from the back of the front
voicemitter housing.
Even though Item 12 in the AFTER PMCS in TM 3-4240-346-10
(Aug 10) is a check for a loose nosecup, Soldiers often miss it. The
consequences can be serious.
When a Soldier clears his mask or exhales, all of the air is supposed
to be blown out the air outlet. If the nosecup is unsealed from the front
voicemitter housing, contaminated air can remain in the mask and be inhaled
by a Soldier. And the PATS test doesn’t always pick up a loose nosecup.
I strongly recommend CBRN
specialists check all their masks
for a loose nosecup. They should
also emphasize to their units
during training the importance
of checking the nosecup before
they go to the field.
If the nosecup is not seated
around the outlet valve body or
has pulled away from the back
of the front voicemitter housing,
the facepiece should be replaced.
Gary Mead
Camp Casey, S. Korea
Editor’s note:
Thanks for the nosecup alert, Gary.
Fox NBCRS
Vehicle…
M40/M42-Series±±Masks…
Beware of Loose Nosecup
Make
very
sure to
check
for a
loose
nosecup
during
PMCS
I wonder
if this info
on your
hydraulic
fluid has
changed in
the last
year?
I can
hardly
bweath!
someding’s
wrong
wid by
nosecup!!
oOh… I should’ve
picked that up
during pmcs.
I
wouldn’t
know… but
I believe
half-mast
has the
answers!
705 40-41.indd
1-2
6/24/11
5:53 PM
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