PS Magazine - TB 43-PS-589

PS, The Preventative Maintenance Monthly

ISSUE 589

DECEMBER 2001
PS Magazine - TB 43-PS-589 - Page 8 of 32
C
rewmen, if you don’t keep
an eye on the turret basket screens,
they’ll soon be flapping loose and
tearing up the inside of your tank.
Each screen is held in place with a screw, NSN
5305-01-388-5093, and ball stud, NSN 5307-01-100-8166.
Vibration loosens the screw until it
falls out or works the ball stud loose
from the friction receptacle on the
back of the turret wall bracket.
In either case, the top of the screen
sags outward. The next time the turret
is traversed, the screen snags and rips
cables and connectors.
Stop loose screws by applying a little sealing compound, NSN 8030-00-081-
2339, to the threads before you tighten them. Also, put a flat washer, NSN 5310-01-
389-9681, between the screw and the screen.
If the ball stud comes loose in
its receptacle, use pliers to pinch
the two tabs on the friction recep-
tacle back together. That provides
enough tension to hold the ball
stud in place.
If one of the tabs breaks off,
replace the friction receptacle
PS 589
DEC 01
13
M1-Series Tanks…
Stop Flagging Screens
Sealing compound
keeps screws tight
W
hen was the last time you checked the pressure in your tank’s fixed Halon fire
extinguishers, crewmen?
If it wasn’t before the vehicle’s last operation, it’s been too long. Low pressure or
empty fire bottles won’t help much if there’s a fire.
Check the pressure
gauge on each of the
three
extinguishers
before every
operation.
Air temperature where
the extinguishers are
located has a big effect
on bottle pressure, so
use this chart for the
minimum
pressure
reading that’s allowed:
PS 589
DEC 01
12
Your tank is NMC if the fire extinguisher pressure
gauge reading is less than the required pressure for
the temperature.
For more details, check out
TACOM Maintenance Advisory
Message (MAM) 01- 013.
Eyeball pressure
gauge and compare
to temperature
40
30
20
10
0
-10
-40
-50
580
550
520
490
470
430
390
360
man, I’m
cold!
It’s 20
degrees
out here!
then
we’ve got a
problem!
the fire
extinguisher
gauges all
read
under
500!
140
120
100
90
80
70
60
50
1,100
920
810
760
720
680
640
610
Temperature
(°F)
Minimum
Pressure
Temperature
(°F)
Minimum
Pressure
Vibration makes
ball stud slip loose
W
M1-Series Tanks…
…on my
turret
basket
screens!
With
all this…
bouncing
around…
oooF!
…I hope
watch…
589. 12-13 (C)
10/20/01
3:25 PM
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