PS Magazine - TB 43-PS-722
PS, The Preventative Maintenance Monthly
ISSUE 722
JANUARY 2013
5
PS 722
JAN 13
W
hen was the last time you
checked and bled the FRH in your
tank’s replenisher, crewmen? If
it has been a while, you could
be putting yourself and others in
danger!
They are easy tasks to complete
and can prevent some serious
problems. If the recoil system
is low on ±uid, or there’s air in
the system, the main gun could
recoil uncontrollably the next
time it’s ²red. When that happens,
the cannon shears its retaining
bolts and slams into the ammo
compartment. You don’t want to
be in the way if that happens!
Replenisher Level
Check the replenisher level by raising the gun tube to maximum elevation. The
replenisher’s reservoir should be at or above the MIN LEVEL mark.
If the replenisher oil level is low, add some FRH now. Here’s how:
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.
3.
Disconnect the hose from the
plug on the top right side of the
replenisher reservoir.
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.
So when do you need to bleed the system? Unless you like living dangerously,
you’d better do it prior to ²ring exercises and every time the recoil system is drained
and re²lled. Here’s how:
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.
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.
4.
Loosen, but don’t remove, the bleed
plug below the gun mount ID plate.
Keep your
Replenisher
on the
Level
M1-Series Tanks…
Keep your
Replenisher
on the
Level
time to
head out to
the firing
range!
you haven’t
checked my
replenisher
level yet…
…and I’m
FeElin’ a
liTtle
Gassy!
hang on,
guys!
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 ±uid level in the replenisher keeps moving down over time, report it. You
could have a Class III leak.
722 04-05.indd
1-2
12/4/12
1:49 PM
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