PS Magazine - TB 43-PS-593

PS, The Preventative Maintenance Monthly

ISSUE 593

APRIL 2002
PS Magazine - TB 43-PS-593 - Page 6 of 32
PS 593
APR 02
11
M1A2 SEP Tank…
AHU Leaks Not NMC
T
here’s a mistake in the PMCS tables of TM 9-2350-388-10 that you M1A2
SEP (System Enhancement Package) crewmen need to know about.
Item 5 says a Class III hydraulic or coolant leak in the air handling unit
(AHU) makes your tank NMC. That’s wrong.
To keep the tank from leaking, have your mechanic remove the leaking AHU
and install the stubbing kit, NSN 2540-01-471-5844. The procedures are on Page
12-105 of TM 9-2350-388-20-2-4. The AHU can then be turned in for repair.
Make a note in your TM until the next update.
M1-Series Tanks…
W
hen was the last time you checked and topped off the FRH level in your tank’s
replenisher, crewmen?
If it was after the last operation, that’s great.
That’s when
the -10-1 TMs say to do it.
But if it’s been longer than that, you could be in danger.
If the hydraulic fluid
level is below the MIN LEVEL mark on the replenisher, the main gun could recoil
out of battery the next time it’s fired.
When that happens, the cannon shears its
retaining bolts and slams into the ammo compartment.
If the replenisher oil level is low, add some FRH now.
Here’s how:
1.
Park the tank on level ground.
2.
Make sure you’re wearing long sleeves, gloves, goggles and a faceshield.
FRH
contains a chemical which can cause paralysis if it’s taken internally.
FRH can also
be absorbed through the skin, so wash thoroughly with soap and water if you get
any on you.
3.
Disconnect the hose from the plug
on the right side of the replenisher.
4.
Uncoil the hose by sliding it out
of the six retaining clips around the
outside of the replenisher.
5.
Extend the hose through the
loader’s hatch.
6.
Put the small BII funnel, NSN 7240-00-404-9793, in the hose and slowly add
FRH, NSN 9150-00-111-6256, until the fluid level reaches the MIN LEVEL mark
on the replenisher.
7.
Remove the funnel, slide the hose back through the retaining clips and reattach it
to the plug on top of the replenisher.
NMC?!?
for a leaking
air handling
unit?
I’m ready to
replenish your
replenisher!
that’s
what I like
to see…
…some-
one who
takes PM
and safety
seriously!
Not
any-
more!
8.
Depress the main gun slightly below
the level position.
9.
Loosen the bleed plug below the gun
mount ID plate using a 15mm socket and
wrench.
Allow all the air to escape until
you see FRH starting to flow from the
bleed plug, then retighten it.
Wipe off any
FRH with a rag and dispose of it properly.
10.
Recheck the FRH level in the replen-
isher.
If the fluid level is below the MIN
LEVEL mark, go back to step 3.
If the fluid level in the replenisher keeps moving down over time, report it.
You
could have a Class III leak.
Disconnect hose here
Loosen bleed plug
to let out air
Disconnect hose here
593. 10-11 (C)
3/1/02
3:03 PM
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