PS Magazine - TB 43-PS-630

PS, The Preventative Maintenance Monthly

ISSUE 630

MAY 2005
PS Magazine - TB 43-PS-630 - Page 6 of 33
PS 630
MAY 05
9
M109-Series SP Howitzers, M992A2 Ammo Carriers…
M
echanics, aluminum and steel roadwheels are both used on M109-series howitzers
and M992A2 ammo carriers. That’s okay as long as you follow a simple rule: Each
road arm must have either two steel or two aluminum roadwheels.
When it’s time to replace a roadwheel, only steel ones are authorized. So if you’ve
got one bad aluminum roadwheel, you’ll have to replace both on that road arm with
steel ones.
Can’t tell ‘em apart? The aluminum wheels, NSN 2530-00-801-6702, have 18
small rivets equally spaced around the rim. There are no rivets on the steel wheels,
PS 630
MAY 05
8
M88A1 Recovery Vehicle…
J
ust because the roadwheel nuts on your M88A1 recovery vehicle are torqued
tightly in place doesn’t mean they’ll stay there, mechanics.
In fact, with all the weight and
pressure they’re under, loose road-
wheel nuts are almost inevitable.
When one nut loosens, it increases
the pressure on the others, setting
off a chain reaction of loose nuts.
The roadwheel wobbles, snap-
ping off the studs, and can cause a
thrown track.
Look for shiny spots around the
flat washer under the roadwheel nut.
That’s a sure sign of a loose nut.
Replace missing nuts with NSN 5310-01-064-3910 and flat washers with NSN
5310-00-809-9514. Retorque loose nuts to 320-350 lb-ft.
Aluminum roadwheels have rivets…
…steel roadwheels don’t
Loose nuts
can damage
roadwheel
Oh, man,
wouldja
look at
this…
…we’re gonna
need a new road-
wheel here!
what kind are
we replacing?
steel
or
aluminum?
OOg…if
only
they
had checked
my road-
wheel nuts!
gah!
630.08-09(C)
3/28/05
7:45 PM
Page 1
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