PS Magazine - TB 43-PS-701

PS, The Preventative Maintenance Monthly

ISSUE 701

APRIL 2011
PS Magazine - TB 43-PS-701 - Page 4 of 33
4
PS 701
APR 11
5
PS 701
APR 11
The gun mount exerciser (GME),
NSN 4933-01-346-1791, was designed
to exercise both 105mm and 120mm
guns. So it can be a little confusing
as to which way to position the GME
when exercising the gun.
Get it wrong and the gun won’t get
the exercise it needs. Plus, the GME
won’t hold properly and you might
damage the clamp.
To mount the GME properly, make
sure the 120mm arrow is pointing
at the bore evacuator.
Then, exercise
away!
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 dirt and sand 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 sand
from the relief valve. Then pull out 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 NSN
Now that the roadwheel’s ready for
lubing, pay close attention to the frst
grease that appears from the relief
valve. If the grease is gritty or watery,
it could be that sand and water are
getting in past the hub seal.
Stop and call your mechanic. New
grease won’t help until the bearings are
disassembled, cleaned and repacked
and a new seal is installed.
No Pain,
No Gain?
M1-Series
Tanks…
No Pain,
No Gain?
M88A1
Recovery
Vehicle…
relieve the presure
120mm arrow should point at bore evacuator
ouch!
that
hurts!
y’think we
got the gun
mount exerciser
backward?
I don’t get it!
I keep pumping grease into
your roadwheels, but
nothing
comes out of the relief valves!
that’s ‘cause you
didn’t clean
the
relief valves first!
Now my hub seals
are
blown!
if you
exercise the
wrong
way,
chances
are you’ll
strain
a
muscle.
exercising
your m1-
series tank’s
120mm gun the
wrong way
will cause
problems,
too.
I dunno.
Valve stem sticking? Replace relief valve
Watery
grease
could
mean
hub seal
leak
701.04-05.indd
1-2
3/1/11
5:46 PM
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