PS Magazine - TB 43-PS-676
PS, The Preventative Maintenance Monthly
ISSUE 676
MARCH 2009
14
PS 676
MAR 09
The Right Tire
M939 trucks can no longer use the
bias tire, NSN 2610-00-262-8653.
Use NSN
2610-01-473-3997 to get tires for basic
M939 trucks. That’s the Goodyear radial
G177 tire. And never mix radial and bias
tires on the same truck! That’s unsafe.
Use NSN 2610-01-214-1344 to get
the super single 14.00R20 tires for your
M939A1 and M939A2 trucks. You’ll see
this NSN in a future M939 IETM.
Mixing Allowed
You won’t see anything in
the future M939 IETM authorizing
the mixing of super-single radial
tires with different treads on
M939s.
You
won’t
Fnd
an
ofFcial message authorizing a
mix either. But testing shows
that
different tire treads can
be safely operated on M939-
A1 and -A2 models.
Use
Right
Tire
and
Right
Mix
M939-Series Trucks…
if not, no
worries.
keep
reading
to get
the info.
hey,
mechanics!
my tires are
bare and I sure
could use some
new ones!
do you know the
rules
for mixing
different tire
treads on your
m939-series
trucks?
Use
Right
Tire
and
Right
Mix
pick
us!
yeah, you
can use
us
both!
do you know
which tires you
can use on your
m939-series
trucks?
Super-Single Tires
M939A1 and M939A2 trucks with super-single tires have two approved sources
of tire supply—Goodyear and Michelin. The Goodyear AT-2A and the Michelin
XZL are currently used on these trucks.
These tires are non-directional.
And you can mix the Goodyear
AT-2A and Michelin XZL tires
with no problems.
The
Michelin
XL
tire
is
directional. You’ll still see some
around even though the Michelin
XZL tire replaced it in 2005.
It’s best to avoid mixing non-
directional and directional tires
on your truck. Not mixing the two
gives your truck its best handling
and braking performance, which
is what you want.
Bottom line is, you shouldn’t have problems if the Goodyear AT-2A spare tire
is used on an M939-series truck using Michelin XZL tires. But if the Michelin tires
on the vehicle are the old XL directional design, you might want to use a Michelin
XL spare.
Mount only directional or non-directional
tires on truck.
No mixing!
676.14-15.indd
1-2
1/30/09
2:00:37 PM
Click here for a copy of this article to save or email.
Back to TopBack to Top
