PS Magazine - TB 43-PS-690
PS, The Preventative Maintenance Monthly
ISSUE 690
MAY 2010
H
ow many times have you hooked a grease gun up to a lube ftting and pumped
away until clean grease comes out oF the relieF valve? Lost count, haven’t you?
In Fact, crewmen have gotten
very
used to doing it that way over the years. So
they’re Faced with a bit oF a challenge when its time to lube the roadwheel arm
bearings on the AVLB.
They’ve got the grease
gun and there’s the lube
ftting,
but
where’s
the
relieF valve? Some crew-
men are so flabbergasted
that
they
immediately
remove the bolt opposite
the lube ftting, screw in
a relieF valve and start
pumping away.
Problem is, there’s not supposed to be a relieF valve. The old grease is supposed to
be Forced out between the arm and arm retainer, not through a relieF valve.
IF they install a relieF valve, grease won’t circulate through the entire housing. Old
grease won’t get replaced and some oF the bearings may not get any lube at all. That’s
a quick way to serve up burned-out bearings.
So, make sure you lube the roadwheel arm bearings quarterly with GAA like it
says in LO 5-5420-202-12 (Mar 92). Just don’t add a relieF valve beFore you do it.
Then make sure you wipe away the excess grease that comes out between the arm
and arm retainer.
6
PS 690
MAY 10
7
PS 690
MAY 10
S
ome periodic housecleaning goes a long way towards keeping your Bradley’s
second generation common electronics unit (SGCEU) on the job, crewmen.
The SGCEU’s cooling
Fan pulls in a lot oF sand
and dirt, gunking up the
insides. Pretty soon, the
cooling Fan is fghting a
losing battle. The SGCEU
overheats and Fails.
BeFore that happens, you
should remove the SGCEU
From under the turret floor.
Then blow out the sand and
dirt that has accumulated
inside the unit with low-
pressure (30 psi) dry air.
Since the unit is coded For Depot repair, you can’t remove the cover. So blow the
unit out at the Fan opening. How oFten you clean it depends on your location. In Iraq,
it should probably be done every Few days.
M2A3/M3A3 IBAS Bradley…
Get the Dirt
Out
!
AVLB…
Something Miing?
Nope!
Be right back! I’ve gotta get
some relief valves so I can lube
the roadwheel arm bearings.
Wait!
You
don’t
need ‘em!
No
relief
valve
here…
…lets old
grease
come
out here
Pull SGCEU and blow it out with low-pressure air
{koff Koff!}
I sure hope they
clean some of
this dust
{Koff!}
and sand out of
my sgceu when we
get back!
690.06-07.indd
1-2
4/6/10
5:11:40 PM
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