PS Magazine - TB 43-PS-584
PS, The Preventative Maintenance Monthly
ISSUE 584
JULY 2001
Howitzers…
You
Repair
the
M90
PS 584
JUL 01
21
C
rewmen, you know that you're supposed to clean mud and dirt off the relief valve
before pumping new grease into the roadwheels of your Paladin or M992A2 ammo
carrier. Otherwise, the grease has nowhere to go except past the roadwheel seal.
So why are so many of those vehicles ending up with blown roadwheel seals anyway?
It's a simple case of out-of-sight, out-of-mind. The relief valves are located on the
backside
of each roadwheel. That makes them hard to see and reach, so many crew-
men forget them.
Don't let your vehicle fall victim to blown roadwheel seals. Use a cloth to wipe
those relief valves clean first. Then have someone eyeball each relief valve to make
sure old grease is coming out while you're pumping in new grease.
Wipe off the relief valves again when you're finished to avoid attracting dirt.
PS 584
JUL 01
20
rewmen, it’s always a good idea to chock the tracks on your combat vehicle, par-
ticularly when you have to park on an incline. After all, there’s nothing worse than
several tons of metal rolling down a hillside when you happen to be at the bottom!
You won’t find chock blocks for your tracked vehicle in the supply system,
though. You’ll have to make your own.
Most units make the chock blocks
out of 4x4-in lumber. Treated wood
works best because it’s less likely to
crack or rot.
Cut each block about 18 inches
long. You’ll need four per vehicle. Put
blocks under each track at both ends.
I
f your howitzer’s M90 radar chronograph, NSN 1290-01-073-0764, is down for the
count,
don’t
send it back to the manufacturer for repairs!
The M90 is being replaced by the M93 muzzle velocity system (MVS), NSN 1290-
01-412-5759, for the M109A6 Paladin and the M94 MVS, NSN 1290-01-412-5760,
for all other howitzers. The manufacturer, Borish Manufacturing, now repairs the
new
MVS only.
Until you receive a replacement MVS through free issue, keep your M90 running
by cannibalizing repair parts from existing unissuable M90s in the supply system. Just
order an M90 through the supply system and use the parts you need.
After you receive your new MVS, contact the item manager, Pressie Beckett, at
DSN 793-3096 or (309) 782-3096. She’ll provide disposition instructions for your old
M90 so that other units can keep their chronographs in service.
Relief
valve?
what relief
valve?
Wait a minute,
soldier! did
you
clean
off
the
relief
valve
first?
You’re
citing
me
for a
moving
violation?
Well, I’m off to
the manufacturer
for repairs!
Wait!
I’m
supposed
to repair
you here!
That’s
right,
son!
M109A6 Paladin, M992A2 Ammo Carrier…
Combat Vehicles…
Relief valve is on
inside
of roadwheel
Chock blocks
keep vehicle
from
moving
If you’da used
some
chock
blocks,
that
tank wouldn’t a’
moved a’ tall.
584. 20-21 (C)
6/4/01
8:56 PM
Page 1
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