PS Magazine - TB 43-PS-627
PS, The Preventative Maintenance Monthly
ISSUE 627
FEBRUARY 2005
O
perators,
do not
use the dozer’s quick-drop feature when the blade is over a ditch
or edge of a sand berm. That’s not spelled out in the CAUTION you’ll find on Page
2-31 of TM 5-2410-237-10.
In the desert, some have found out the hard way that the quick-drop lets the blade
fall quickly when you put the blade control lever in the
F
(float) position.
Problem is, there’s no built-in stop. The blade drops until it hits the ground, or the
end of the cylinder rod hits the end of the cylinder and rips the nut off the rod. Then
the blade’s lift cylinder rods are yanked out of the cylinder. Your construction oper-
ations come to a screeching halt!
Never let the
blade
drop
18
inches or more
below the bottom
of the vehicle’s
tracks. Use the
F
(float)
position
with care, or shift
to
L
to lower the
blade under power.
PS 627
FEB 05
25
D7G Tractor…
Float Blade Reminder
PS 627
FEB 05
24
D7G Tractor…
I
t could be a crack in the air/fuel ratio line that mounts into the air/fuel ratio valve
that mounts into the fuel injector pump on the vehicle’s curbside. Because of the age
of the equipment and vehicle vibration, this line often cracks where it’s mounted to
the engine block by a small bracket.
The crack is in that part of the line behind the bracket, so you won’t see it. The
only way you can find the crack is to have your mechanic remove the bracket so he
can eyeball the line.
A crack in the line means the
engine loses turbo boost pressure
that’s sent to the air/fuel ratio valve.
When this happens, the fuel injector
pump can’t meter the increased fuel
that’s needed to push the load.
If your dozer runs fine but shows
these symptoms when under a load,
have your mechanic come in for a
quick look-see. He can replace the
line with NSN 4710-01-253-7056.
Then your dozer should run like a
scalded dog!
After PMCS, you hop in
the driver’s seat for
the day’s run.
The engine cranks over—it
sounds fine, runs fine,
but falls flat on its nose
when you push a load.
What
gives?
yep.
hey!
Fuel Line Crack
Look behind
clamp for a
crack in
air/fuel ratio
line
On level ground,
it’s OK to use the
F position to drop
the blade quickly.
Use
F
with care
what’s
that
noise!?
you used
float
and my
blade dropped
too far!!
627.24-25(C)
12/24/04
2:43 PM
Page 1
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