PS Magazine - TB 43-PS-703
PS, The Preventative Maintenance Monthly
ISSUE 703
JUNE 2011
46
PS 703
JUN 11
The
amount
of
sag
in
your
track tells you when to make an
adjustment. Measure sag by laying
a straight edge across the top of the
track from the idler to the front track
support roller. If the track sags more
than 1
1
/
2
inches in the middle, it’s
time for your mechanic to adjust it.
Rules to Doze By
•
Slow down, especially in reverse.
•
Keep track alignment right on the nose.
•
Clean mud and debris from the undercarriage.
•
Use rock guards to reduce wear.
•
Never spin the track.
•
Check for loose or missing hardware. Make
sure all hardware is torqued.
1.
Make sure the dozer is on level ground.
2.
Open the cover to the track adjustment
mechanism and connect a grease gun
to the lube fitting. Pump in grease until
the track idler is as far forward as it will
go. At this point, the track will be
almost straight between the front
carrier roller and the idler.
3.
Put a mark on the track roller frame,
½ inch behind the rear edge of the
idler bearing assembly wear plate.
4.
Open the hydraulic relief valve 1/6 turn
at a time. You can tell if grease is
escaping by watching your track. It’ll
get loose. Wear eye protection while
pumping grease, and never look
directly into the relief valve. A shot of
high-pressure grease could blind you.
5.
Once the track is loose, place a track
pin or drawbar pin between the
sprocket teeth and the track.
6.
Start your dozer and back it up until
the idler backs up ½ inch or more.
The pin will be at roughly the
12 o’clock position.
7.
Close the relief valve. Connect the
grease gun and pump in grease until
the rear edge of the idler bearing
assembly aligns with the mark on
the roller frame.
Undercarriage PM
D7G
Tractor…
Undercarriage PM
once your dozer is back
on the job, follow this
checklist for a longer
undercarriage life:
mechanics,
here’s how
to do it…
Pump in
grease
Measure sag here
Measure back to
1
/
2
inch
Use
pin to
loosen
track
Align with mark
operators,
the well-
being of the
d
7
g dozer’s
undercarriage
components
hinges on
good track
adjustment.
if the track’s too tight, it puts a lot of stress
on undercarriage and drive train components.
if it’s too loose, the track flaps, wearing
out roller flanges and sprocket teeth.
703.46-47.indd
1-2
5/13/11
1:45 PM
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