PS Magazine - TB 43-PS-624
PS, The Preventative Maintenance Monthly
ISSUE 624
NOVEMBER 2004
M989A1 HEMAT Trailer…
Belly Up to the Towbar
O
perators, when was the last time you bellied up to the towbar and ordered a shot
of grease for your HEMAT trailer’s towbar pivot?
Without regular lube, the old
grease solidifies and loses its lubri-
cating properties. That leads to goug-
ing, scoring and rust on the towbar
pivot cylinder. Eventually, the towbar
won’t raise, lower or pivot at all.
Once a week—daily if you’re in a
dusty or sandy environment—lube
all five grease fittings on the towbar
pivot with GAA. Continue pumping
until you see clean grease seeping
out of the assembly. Then wipe off
the excess to keep from attracting
sand and dirt.
If the towbar pivot won’t take any
grease, call your mechanic. He’ll
take apart the assembly and clean out
the old, hard grease that’s plugging
up the works.
PS 624
NOV 04
10
HMMWV…
Dear Half-Mast,
I am currently deployed in Iraq and drive a
HMMWV on a daily basis.
When we come under attack, the engine
governor in my vehicle will only allow me to go
55-60 mph. Trust me, that doesn’t seem very
fast in the middle of an ambush.
Can you provide me instructions and a list of
special tools needed to remove the governor?
A little extra speed would be very appreciated.
SPC J.R.T.
Removing the engine governor on your HMMWV is
not
a good idea.
The engine governor is designed to help control engine speed and prevent
engine runaway. Not only will removing the governor not result in higher
speeds, but it will also damage the engine’s bearings, piston rods, and pistons.
It can also have a bad effect on belt-driven accessories such as the alternator,
power steering pump, and air conditioner.
A speed of 55-60 mph may seem slow when the bullets are flying, but it’s a
whole lot faster than a HMMWV that won’t move at all.
Dear
Specialist
J.R.T.,
can’t we
go any
faster!?
this
is
our top
speed!!
Too little
lube
causes
scoring
and rust
on pivot
cylinder
Lube towbar pivot at least weekly with GAA
barkeep! gimme
a
double shot
of gaa!
sure you
can handle
that much,
stranger?
it’s not for
him!
it’s for my
towbar pivot
assembly!
5th lube
point is
out of
view
624.10-11(C)
9/23/04
4:04 PM
Page 1
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