PS Magazine - TB 43-PS-682
PS, The Preventative Maintenance Monthly
ISSUE 682
SEPTEMBER 2009
6
PS 682
7
SEP 09
SEP 09
PS 682
The 2/30 Minute Rule
M88-Series APU Hydraulic Pump
Turning in a bad auxiliary power unit (APU) for your M88-series recovery vehicle?
Better make sure it has the hydraulic pump, NSN 4320-00-613-6607, attached. Units have
been removing the pump before turn-in, driving up repair costs. If you turn in an APU
without the pump, your unit will now be charged $190 for a replacement pump. So,
make sure everything’s there before turn-in.
If the gun system malfunctions, place the tank into full NBC mode and allow the
turret to pressurize for
2
minutes. After full pressurization, the loader can safely
lower the breechblock. Over-pressurization of the turret will keep any burning gases
from entering the crew compartment.
If the NBC system is not operating, you must wait
30
minutes before opening the
breechblock. This will allow any burning gases to completely dissipate. After the 30
minutes, the loader can safely lower the breech.
You must then troubleshoot the system and correct any faults
you Fnd before the tank can resume Fring.
if the breechblock doesn’t fully
open or the stub base doesn’t
fully extract after firing, you
could be faced with a flareback.
stop
and follow the
procedures outlined in
your operator’s manuals.
the
safety of
the entire
crew
could
depend
on it!
The operator’s
manual provides
two wait periods,
depending on the
situation. This
is known as the
2/30 minute
rule.
2/30
minute
rule
Dear Half-Mast,
We’re working on an M88A1 and need to order a new exhaust pipe for the
exhaust manifold. Unfortunately, there’s a disconnect between the vehicle
and engine parts manuals.
According to Item 9 in Fig 13 of TM 9-2350-256-24P-1 (May 92),
we’re supposed to order NSN 2990-01-017-5187. But Item 16 in Fig 24
of TM 9-2815-220-24P (Dec 05) says to order NSN 2990-01-085-
3831. Which one is correct?
SPC D.J.S.
Correct PN
Correct
NSN 2990-01-
Item/Fig
Item 7, Fig 13
Item 9, Fig 13
Item 4, Fig 14
Item 11, Fig 14
11684193
11684185-1
11684194
11684187-1
017-5186
085-3831
017-5187
085-3832
Exhausting Search
for New Pipe
the engine parts manual,
tm 9-2815-220-24p, is
correct. use nsn 2990-
01-085-3831 to get the
exhaust pipe you need.
turns out the wrong part numbers were
listed for four of the items in figures 13 and
14 of tm 9-2350-256-24p-1, including the
one for that exhaust pipe. jot down these
changes until the tm can be updated…
I need to get you a new
exhaust pipe but these
tms tell me to order
two different pipes.
I
don’t
know, but I
bet
half-
mast
does!
which
One is the
right one?
M88A1
Recovery
Vehicle…
do not remove
a stub base
until after the
required wait
time.
682.06-07.indd
1-2
8/3/09
2:55:15 PM
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