PS Magazine - TB 43-PS-569
PS, The Preventative Maintenance Monthly
ISSUE 569
APRIL 2000
Finally, if you reset the indicator and it stays in the red zone after installing a
new or clean primary filter element, that is a sure-fire indication of a clogged
secondary filter.
Tight Seal Deal
With the filter elements installed, be careful how the canister lid goes back
in place. That lid needs a tight seal to
keep out dirt and sand, two culprits
that can ruin your dozer’s turbocharger
and engine.
The lid has a recessed lip with a
raised mark on its outer cover. Make
sure this area points toward the front
of the vehicle. That way the primary
filter element fits tight against the lid
with a good seal.
Use Caution with Blade Float
O
perators, make sure you heed the CAUTION on Page 2-31 of TM 5-2410-
237-10. Never use the D7G dozer blade’s quick drop option when it’s over a
ditch or big hole.
The blade falls quickly when you put the blade control lever all the way
forward, in the float position. Problem is, there’s no built-in stop.
The blade drops until it hits the ground, or until 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 cylinders.
That brings your dozer operations to a
screeching halt.
So never let the blade drop 18 inches
or more below the bottom of your
dozer’s tracks. Use the float position
with care, or lower the blade under
power.
On level ground, it’s okay to drop
the blade quickly.
D7G Tractors . . .
Use low-pressure air from a nearby
tactical vehicle to blow air—30 psi or
less—from inside to outside to loosen
dirt and sand from the dozer’s air filter
element. Never bang the filter on a rock
or hard surface like the dozer’s track.
Replace the primary air filter element
once a year, or after six cleanings.
When the dozer’s secondary filter
becomes clogged, have your unit me-
chanic replace it. How do you tell if
it’s clogged?
Simple.
After installing a clean or new pri-
mary filter element, if the indicator
moves into the red zone when you try
to start, the secondary filter’s clogged.
Black exhaust smoke is another indi-
cation of a clogged filter.
Air filter indicator showing red?
You
sure are
dirty
.
that's
my
job
!
perators, your dozer needs clean air to do its job. Its filters can provide that
air, with a helping hand—and eye—from you.
Check the Indicator
Keep an eye on the dozer’s air
cleaner indicator. It’s right next to the
canister. If the indicator moves from
yellow to red, open the canister and
pull out the primary air filter.
Raised mark points towards vehicle front
Use float position with care
PS 569
23
APR 00
PS 569
22
APR 00
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