PS Magazine - TB 43-PS-566
PS, The Preventative Maintenance Monthly
ISSUE 566
JANUARY 2000
130G Graders . . .
Bleed the Brakes
O
perators, you’ve got to bleed your 130G
graders’ air brakes each day after use.
If you forget, moisture in the air lines
leads to corrosion. Corrosion plugs up
brake valves and cylinders and leads to
brake failure.
So drain the water from each air tank at
the end of the day. Just open each tank’s
valve until no more water comes out. Close
the valve tightly when you’re done.
n AOAP report just came back
from the lab. It says the transmission
fluid in your dozer is contaminated with
metal shavings.
What gives? You always change the
transmission’s primary filter.
What gives is a clogged screen in
the transmission system’s magnetic
strainer.
A clogged screen restricts oil flow in
your D7G’s transmission. The result is
wear and tear in the engine and trans-
mission, and a bad AOAP report.
Cleaning the screen and magnets
is a 250-hour service in LO 5-2410-
237-12 and TM 5-2410-237-20.
D7G Tractor . . .
Install the magnets, screen, spring
and cover, in that order. Torque the
cover nuts to 31–34 lb-ft dry (no oil)
or 23–25 lb-ft wet (threads lubed with
oil).
With the engine running and the
transmission in neutral, pull the dip-
stick to measure the oil level. Add oil
to bring it to the FULL mark on the
dipstick.
If you’re in the motor pool, steam
clean the screen and magnets, and then
dry them with pressurized air. In the
field, wash the screen in P-D-680 dry
cleaning solvent. Clean the magnets
with a stiff bristle brush. Don’t use
a
wire
brush! That can scratch or
demagnetize them. And, don’t drop or
tap the magnets. That can demagnetize
or break them.
Here’s how:
Remove the cover and spring, then
remove the filter assembly.
...and filter assembly
Remove cover.
..
metal
shavings!?
But i
just
changed
the
primary
filter
!
did
you check
my
magnetic
strainer
?
PS 566
27
JAN 00
Replace worn seal
Use stiff bristle brush to remove shavings
Wash screen in P-D-680 dry cleaning solvent
1.
2.
3.
4.
5.
Check the cover seal for cracks, tears
or mashed edges. If you find any, re-
place the seal, NSN 5330-00-863-5549.
Open each valve to let water out
JAN 00
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