PS Magazine - TB 43-PS-743
PS, The Preventative Maintenance Monthly
ISSUE 743
OCTOBER 2014
16
PS 743
OCT 14
17
PS 743
OCT 14
Dear Half-Mast,
We’ve noticed that the tires on some M915A3 front wheel assemblies are
a different size than the ones on the rear. All our other M915-series trucks
have the same size tires on the front and rear. What gives?
Mr. J.R.G.
Dear Sir,
Good eye! Here’s the story.
Starting with serial number V71659, the M915A3-series tractor truck was built
to support up-armor requirements. That requirement resulted in several component
changes and upgrades to the suspension, brakes, air tanks and tires.
As you’ve noted, the front tire has changed in size and load range. The original
11R22.5 tires could not safely handle the added weight of the up-armor. That
resulted in a change to the 12R22.5 tire.
However, the vehicle’s rear tires couldn’t be increased because that would’ve
changed the existing height requirement for the Ffth wheel. Using 12R22.5 tires on
the rear raised the Ffth wheel enough that road permits would be required to haul
full-sized containers.
So when you need to change out the front tire and wheel assembly on M915A3s
with serial number V71659 and above, use NSN 2530-01-537-8297. That gets the
right size tire for your truck.
C
rewmen, it’s easy to break the snap hook on the M1000 HET semitrailer’s ramp
chain restraint if it’s not attached to the load binder handle the right way.
The snap hook, NSN 5340-
01-471-7034, keeps the load
binder handle in the locked
position. The hook has to be
attached correctly to keep it
from hitting the trailer deck
and breaking when the load
binder handle is unlocked.
You can keep that from
happening by attaching the
Fxed loop end of the snap
hook to the quick link on the
chain side. Do not attach it to
the handle end.
Attaching the Fxed loop end
lets you detach the snap hook
from the quick link handle side
when unlocking the handle.
The snap hook stays attached
to the chain instead of hitting
the deck and breaking.
M915A3-Series Trucks…
M1000 HET Semitrailer…
Avoid
Snap
HOk
Snafu
Fixed loop
Fixed loop
Attach fixed
end loop of
snap hook to
quick link on
chain side
Do not
attach fixed end loop of
snap hook to quick link on handle side
Quick link on
chain side
Quick link on
handle side
what’s
that?
it’s a new
snap hook
to replace
the one that
broke
on your
load binder
handle.
Just make
sure you hook
it up right
this
time.
You don’t
want to break
another
one!
I know my
front tires are
suPposed to
be biGger than
mY reaR tires…
but this is
RidicUlOus!
743 16-17.indd
1-2
8/25/14
12:12 PM
Click here for a copy of this article to save or email.
Click here for a copy of this article to save or email.
Back to TopBack to Top
