PS Magazine - TB 43-PS-741
PS, The Preventative Maintenance Monthly
ISSUE 741
AUGUST 2014
19
PS 741
AUG 14
D
uring checks and services, you may fnd that your
130G road grader’s turbocharger is shot. Talk about
an unwelcome surprise!
So what gives?
When the grader is transported on the back oF a
semitrailer, the exhaust pipe Faces directly into the
wind. That Forces air down the exhaust pipe and into
the turbocharger.
All that Forced air causes the turbocharger’s
impeller to spin. But since the grader isn’t running,
no oil is being pumped to the impeller bearings. No
lubrication means a damaged turbocharger.
So how do you prevent turbocharger burnout? Try
one oF these two methods:
1.±
Put a few strips of duct tape, NSN 5640-00-103-2254,
over the exhaust stack opening. The duct tape keeps
air out of the stack and away from the turbocharger.
Just remember to remove the tape before startup.
2.±
Have your mechanic loosen the exhaust pipe’s pipe
clamp. Turn the pipe so its opening faces the back
of the trailer. Then re-tighten the clamp. There’s no
need to reposition the exhaust pipe once you arrive
at the construction site.
Dear Half-Mast,
While chewing the fat in the
break room of our engineering
battalion, we had a little
maintenance disagreement
about tires.
Some say it doesn’t matter
which way the tread pattern on
a tire faces. Others argue that
mounting a tire with the tread
facing the wrong way results in
lost traction and faster wear.
We finally decided you could
set us straight. So which is
it? Does the direction of tread
pattern matter or not?
SFC G.V.J.
If you’re not sure which way to
mount one of these tires, take a
close look at the sidewall. You’ll
see a direction arrow that points
the way the tire should turn when
going forward.
Dear Sergeant,
Unfortunately, the answer is both yes
and
no. It all depends on the vehicle.
Tactical
vehicles,
like
HEMTTs
and
M939-series trucks, use non-directional
tires. That means the tread pattern can go
either direction. Of course, it’s always a
good idea to make sure the tread pattern
faces the same direction for all tires on the
same axle.
But
with
the
large
tires
used
on
construction
equipment,
it’s
a
whole
different story. Those tires are designed
for off-road use in loose sand, dirt, mud
and gravel. When pointed in the right
direction, the chevron pattern on the tires
provides the traction the vehicle needs.
130G
Road
Grader…
Turn the
Tables
on
Turbo
Burnout
Construction±Equipment…
Just Follow
the
Arrow!
Make sure opening faces
back
of trailer
Note
rotation
arrow
With my
tread turned
in
different
directions,
I
don’t know if
I’m coming or
going!
with all
this air
forced
down my
exhaust
pipe…
…my turbo-
charger has
had it!
741 18-19.indd
1-2
7/7/14
10:53 AM
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