PS Magazine - TB 43-PS-595

PS, The Preventative Maintenance Monthly

ISSUE 595

JUNE 2002
PS Magazine - TB 43-PS-595 - Page 11 of 32
M
ost people don't work well under a lot of pressure. The same holds true for the
roadwheels on your M88A1 recovery vehicle, crewmen.
A roadwheel relief valve that's clogged with crud won't relieve pressure when
you pump in new grease. The pressure grows until something gives—usually the
hub seal.
When the seal goes, so does
the lube. The result is burned-
out bearings.
So before adding new
grease, use a cloth to wipe
away any dirt and mud from
the relief valve. Then pull out
on the valve stem.
If it slides out smoothly and
pops back in when you release
it, the valve's OK. If it doesn't,
replace it with relief valve,
PS 595
JUNE 02
19
M88A1 Recovery Vehicles…
Valve stem
sticks?
Replace
relief valve
I don’t get
it! I
just
lubed
those
roadwheels!
yeah, but you
didn’t
clean
my relief
valves
first!
my
seals
are all
blown!
you’re gonna
get my cannon
tube condemned
before
its time!
let’s see…
we fired 20
rounds and the
temperature’s
above 100
°
…
…so that
means we
record…
40 rounds!
don’t retire tube too early
t
he M256 cannon tube on your M1A1/A2 tank isn’t cheap, crewmen, so don’t
replace it before you have to. The safe service life of the M256 cannon tube is
1,500 equivalent full charge (EFC) rounds. For some cannon tubes, when the
ammunition’s ambient temperature rises to 100°F or higher, the EFC count
increases from one to two for each round fired.
There is no temperature sensitivity for M256 ammunition, so its EFC count
remains at one regardless of the temperature. See Page B-5 of TM 9-1000-202-14,
Evaluation of Cannon Tubes,
for the straight scoop.
Don’t mistakenly enter the wrong number of rounds on the DA Form 2408-4,
Gun Record Card,
just because it’s hot outside. If you do, the tube will be con-
demned too early.
M1A1 MRS O-Ring
U
se NSN 5331-00-965-0719 to get improved O-rings for the muzzle reference
sensor (MRS) on your M1A1/A2 tank. The old O-rings, NSN 5331-00-724-7902,
leak, requiring constant changing of the desiccant. Make a note until Item 10 in
Fig 90 of TM 9-2350-264-24P-2 and Item 9 in Fig 79 of TM 9-2350-288-24P-2
can be changed.
Hey, waitaminit!
temperature
doesn’t
affect
my rounds fired
count!
M1A1/A2 Tanks…
595. 18-19 (C)
4/27/02
11:54 AM
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