PS Magazine - TB 43-PS-716
PS, The Preventative Maintenance Monthly
ISSUE 716
JULY 2012
4
PS 716
JUL 12
5
PS 716
JUL 12
w
hat’s that sound, you ask? Could it be your Stryker’s engine drowning in wash
water?
Sure, you want to give your Stryker a good washing, but that doesn’t mean
you need to spray every nook and cranny. And the air intake defnitely rates as an
important cranny!
Even low-pressure water can get inside an uncovered air
intake. Then the next time
your Stryker is started, all that water gets sucked straight into the air flter canister. A wet
flter blocks good air Fow, choking the engine. That’s a sound that’s sure to make
you cringe.
Be±ore you wash your Stryker, make sure the air intake is properly covered with
the environmental cover, NSN 5340-20-000-0188.
Dear Half-Mast,
The lubrication order in TM
9-1025-215-10 (May 10)
says to use OHT hydraulic
fluid (MIL-PFR-6083)
for our M777A2 towed
howitzers. It comes in a
1-qt bottle, NSN 9150-
00-935-9807, or a 1-gal
bottle, NSN 9150-00-
935-9808.
We recently found that
some of our organizational
maintenance personnel are
using OHA hydraulic fluid
(MIL-PRF-5606),
NSN 9150-00-252-
6383, instead.
Is it OK to use OHA in
these howitzers? If so, can
you mix OHT and OHA?
Hans-Juergen Pirner
Peter Kohler
Rainer Doerner
Maintenance Activity
Vilseck Armament Team
Germany
Dear Gentlemen,
The answer to your question is a little
tricky. First of all, OHT is de±nitely the
hydraulic ²uid to use.
It is possible for OHA to be used, but
only
in a worst case scenario while in a combat
environment.
See Note 2 in Appendix D of
IETM 9-1025-215-24&P,
Battle Damage
Assessment and Repair (BDAR).
Also note that the Remarks column for
OHT in Appendix D states,
“Not
interchangeable with any other type or
grade o± hydraulic Fuid. It is compatible
with MIL-H-5606, MIL-H-46170, and
MIL-H-83282. It can be mixed with these
Fuids, but cannot be used as a substitute.”
So as far as your question about mixing the
two hydraulic ²uids, the answer is a tentative
yes, but
only
in the extreme circumstances
listed above. Mixing the two will degrade
seals and lead to component damage.
Keep water away from air intake…
...or it ends up inside air filter canister
Stryker…
g
u
r
g
l
e
,
g
u
r
g
l
e
!
M777A2 Towed Howitzer…
OHT,
OHA,
or
Both?
hey!
he’s
choking!
Does
anyone
know
CPR?!
I’m
the
hydraulic
fluid to
use
in
the M
7 7 7
A2!
Can’t I even
mix with you
a little?
You mean
I’m
out?!
716 04-05.indd
1-2
5/21/12
9:35 AM
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