PS Magazine - TB 43-PS-596
PS, The Preventative Maintenance Monthly
ISSUE 596
JULY 2002
PS 596
JULY 02
25
M9 ACE…
W
hen it comes to a vehicle’s hydraulics, the armored combat earthmover (ACE) is
known for being temperamental—especially when digging in hard-packed dirt.
Experienced ACE operators have a rule about vehicle downtime: They take a
break and shut down every two hours during operations. During that break, they
check for problems—including hydraulic ones.
To make hydraulic
checks easier before the
day’s run at the worksite,
leave the earthmover’s
ejector out about two
feet. With the ejector for-
ward,
there’s enough
room behind it to look
for a busted compensa-
tion pump or a leak in the
valve bank.
If you pump up the pressure and the
pressure won’t stay in the accumulator,
it’s probably a bad solenoid. If the
solenoid sticks open even a crack,
pressure leaks out of the accumulator.
Replace the solenoid, NSN 4810-
01-351-5845, and the accumulator
should start pressuring again.
Cover the trailer brake handles with
tape before you send the trailer to the
paint shop. If the the handles are paint-
ed, they can become impossible to
move. Sometimes the whole brake sys-
tem must be replaced.
I just
can’t seem
to accumulate
any pressure…
…must
be my
solenoid.
Tape brake handles
before painting
OK, you did
your part
with PMCS, so
I did mine…
…I've cleared
a path through
that mine field
for you.
with the
ejector for-
ward, we can
look for any
leaks in the
valve bank.
You
can dig
into that dirt…
I
don’t feel like
it right now.
596. 24-25 (C)
6/1/02
11:43 AM
Page 1
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