PS Magazine - TB 43-PS-684

PS, The Preventative Maintenance Monthly

ISSUE 684

NOVEMBER 2009
PS Magazine - TB 43-PS-684 - Page 27 of 33
50
PS 684
NOV 09
Well, it could be a crack in the air/fuel
ratio line that mounts into the fuel injector
pump on the vehicle’s curb side. Because of
vehicle age and vibration, this line often
cracks where it’s mounted to the engine
block by a small bracket.
The crack is usually in the part of the
line behind the bracket, so you won’t see
it. Your mechanic will have to 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 Fne but shows this symptom 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 greyhound!
ATLAS Forklift Windshield
To get the windshield for the SKYTRAC 10,000M forklift use NSN 2510-01-301-2248.
This replaces the parts info shown as Item 16 on Page 139-1 of TM 10-3930-673-24P.
O
perating in dirt and mud is murder on the dozer’s sprocket bearings.
That’s because water and dirt get past the
seals and into the bearings, causing abrasion
and corrosion that eat at the bearing’s polished
surfaces. Worn bearings knock the dozer’s
track out of alignment—causing excessive
wear and tear on the vehicle’s undercarriage
components.
To head off problems, lube the bearings
every time you Fnish a day’s run in mud or
water. Pump in grease until new lube comes
out around the diagonal bearing cap assembly,
which is behind the drive sprocket.
SEE Thermostat
Use NSN 6685-01-341-6899 to get a cooling system thermostat for the small
emplacement excavator. This NSN replaces the parts info shown as Item 4 in Fig 47 of
TM 5-2420-224-24P-1.
…A
CraCk
in the Fuel Line?
D7G Tractor…
D7G
Tractor…
Lube SproCket Bearings
you hop in
the dozer’s
driver seat
for the
day’s run.
the engine
cranks over.
it sounds
fine and runs
fine, but…
…it falls
flat on its
face
when
you push a
load.
you did the
vehicle’s
pmcs–so
what gives?
is it…
Look behind
clamp for a
crack in
air/fuel ratio
line
urk!
this
mud is
killin’
my sprocket
bearings!
Pump grease here
hey,
quit it!
684.50-51.indd
1-2
9/30/09
12:31:40 PM
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