PS Magazine - TB 43-PS-574
PS, The Preventative Maintenance Monthly
ISSUE 574
SEPTEMBER 2000
PS 574
25
SEP 00
orking in mud is murder on D7G drive
sprocket bearings.
Water and dirt can get past the seals and
into the bearings, causing corrosion that
eats 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 finish a day’s run in
mud or water. Pump in grease until clean lube comes out around the diagonal
bearing cap assembly, which is behind the drive sprocket.
perators, the grease fitting for the D7G dozer’s fan pulley is hidden behind
the fan blades. That means it’s out of sight unless you hop up on the track, reach
in, and try to find it.
Without lube, the fan pulley’s bear-
ing seizes up. Then the blade stops
turning freely, letting the engine and
transmission overheat.
Don’t make things hot for that bear-
ing. Find its fitting and lube it during
scheduled services.
CB-534B Vibratory Roller . . .
Clamp Down Rubber Boot
O
perators, a little water in the wrong place can bring your vibratory roller to
a screeching halt.
The rubber boot that fits over the propul-
sion control valve and shift lever assembly
can come loose during operation. If water
gets past the boot, it shorts out the valve’s
electronic relays. The end result is a roller
that won’t shift or can’t engage its power
takeoff (PTO).
So eyeball the boot. If it’s loose, report it.
Your mechanic can put a hose clamp, NSN
4730-00-908-6294, around the boot’s outer
edge to hold it in place on the console.
D7G Tractor . . .
O
perators,
clean the sight
gauge on your
D7G dozer’s
winch the wrong
way and all
you’ll see is
damage.
Wire brushes,
screwdrivers or
Sight Gauge Cleaning
Clean sight glass
with low-
pressure water and clean cloth
knife blades will
scratch the sight
glass. Then you
can’t do a visual
check for oil.
Clean the
glass only with
low pressure
water and a
clean cloth.
urk!
this mud is
murder
on my
sprocket
bearings!
oh, yeah,
i was
supposed
to
lube
that fan
pulley!
now
he
remembers!
Pump grease in here
Lube fan pulley bearings
Torn boot lets water in
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