PS Magazine - TB 43-PS-745

PS, The Preventative Maintenance Monthly

ISSUE 745

DECEMBER 2014
PS Magazine - TB 43-PS-745 - Page 6 of 33
8
PS 745
DEC 14
Bleed Recoil System
Checking the FRH level in the replenisher isn’t all you need to do, though. If
there’s air in the system, the replenisher could give you a false reading. The level
may look good when it’s actually low.
Bleed the system prior to ±ring exercises and every time the system is drained and
re±lled. Here’s how:
5.±
Allow all the air to escape until you
see FRH starting to ooze from around
the bleed plug.
6.±
Retighten the bleed plug. Wipe off
any FRH with a rag and dispose of it
properly.
7.±
Recheck the replenisher reservoir.
Add FRH if needed.
c
rewmen, your M1’s main gun could recoil uncontrollably the next time it’s ±red if
the recoil system has too little ²uid or too much air. When either happens, the cannon
can shear its retaining bolts and slam into the ammo compartment—de±nitely not
something you want happening to you or anyone else in the turret!
So if your tank’s replenisher has been drained for maintenance, or if you’re
preparing for a ±ring exercise, here’s what you need to do:
Replenisher Level
1.±
Park the tank on level ground and raise the gun tube to max elevation.
2.±
Make sure you’re wearing long sleeves (rolled down), rubber gloves, goggles and a
faceshield. FRH contains a chemical that can cause paralysis if it’s taken orally. FRH can
also be absorbed through the skin, so wash thoroughly with soap and water if you get
any on you.
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.
If the ²uid level in the replenisher keeps moving down over time, report it. You
could have a Class III leak.
3.±
Disconnect the hose from the plug on the top right side of the replenisher reservoir.
1.±
Make sure you’re wearing long
sleeves, gloves, goggles and a face
shield for protection.
2.±
Elevate the main gun to maximum
elevation with the hydraulic pump
handle and check the replenisher
to make sure it’s full.
3.±
With turret power off and the
system hydraulic pressure reduced
to zero, manually depress the gun
tube just below level.
M1-Series Tanks…
4.±
Loosen, but don’t remove, the
bleed plug below the gun mount
ID plate.
you ready
for Our fire
mission?
not until
you’ve bled my
replenisher. I’ve
got a bad case
of
{uRrP!}
air
in the system.
Now
we’re
talking! I
could do this
all day!
745 08-09.indd
1-2
11/4/14
10:36 AM
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