PS Magazine - TB 43-PS-737
PS, The Preventative Maintenance Monthly
ISSUE 737
APRIL 2014
14
PS 737
APR 14
15
PS 737
APR 14
o
perators, make sure you turn off your vehicle’s hydraulic enable switch and move
the rotary selection switches to the OFF position after the day’s run.
If you leave them on, the hydraulic
manifold solenoids burn out. That means
you’ll lose auxiliary capabilities such as
pumping, winching, crane operations, and
tow cylinder functions.
So make sure you turn the switches off.
By the way, you’ll know the switches are
still on if you see the MAIN HYD ENABLE
light illuminated on the dash inside the cab.
Uh-oh!
That’s what we sometimes hear when a mistake is made. But it’s not until the
mistake is found that we can focus on the solution.
A manufacturing error resulted in the wiring harnesses being routed directly across the
top of the hydraulic distribution manifold in some HEMTT -A4 trucks. Routed this way, the
wiring harness might start a fire.
If you find any, contact Oshkosh Corporation to schedule the vehicle for repair.
They’re at:
WarrantyClaims@defense.oshkoshcorp.com
Oshkosh will provide the required parts and labor to fix the trucks at no cost to your
unit. They’ll repair the vehicles as part of a retrofit effort that includes rerouting the
wiring harnesses.
Need more assistance? Contact your TACOM LCMC logistics assistance representative
(LAR) or your state surface maintenance manager.
Dear Half-Mast,
We need your help with the hydraulic
filter shown as Item 69 in Fig 384 of
the HEMTT -A4 IETM, TM 9-2320-
326-14&P (EM 0288). The figure
breaks out the filter element, but
doesn’t show the O-rings that are
required for service. How can we
get them?
SFC D.B.
Dear Sergeant D.B.,
The O-rings you need come with
NSNs 5331-01-618-2067 and 5331-
00-172-7223. TACOM LCMC will
include them in a future revision to
the HEMTT -A4 IETM.
Check
switch if
MAIN HYD
ENABLE
light is on
HEMTT -A4…
HEMTT -A4…
Misrouted Wiring
Warrants Warranty
Wrong
right
HEMTT -A4, PLS A1…
Switch OfF hydraulic enable switch
The solution is for you
mechanics to inspect
all HEMTT -A4 hydraulic
distribution manifolds.
Make sure that
no
wiring harnesses are
routed over the top of
the manifold.
it may be
some of
Your wiring
harnesses
were routed
over your
hydraulic
distribution
manifold.
uh-oh!
Something inside
my engine compartment
doesn’t feel right!
uh-oh is
right!
there’s
got
to be a
better
way to find the
O-rings we need for
the hyDraulic filter!
pays yEr
money and
takes yer
chance!
737 14-15.indd
1-2
3/5/14
5:00 PM
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