Variables That Affect
Wear Life
See pages 11 through 25 for details on the
effects of: Page
Controllable Variables 11
Track Adjustment 11
Shoe Width 12
Alignment 14
Non-Controllable Variables 21
Soil & Underfoot Conditions 21
Underfoot Conditions 22
Partially Controllable Variables 25
Components
Sealed and Lubricated Track
Sealed and Lubricated Track is used exclu-
sively on the elevated sprocket tractors
because internal pin and bushing wear,
found in Sealed Track, would be acceler-
ated on these models.
On low sprocket track-type tractors with
Sealed Track, internal pin and bushing
wear occurs in one position. The elevated
sprocket design has three positions where
internal pin and bushing wear would occur
if it used Sealed Track. Sealed and Lubri-
cated Track reduces internal pin and bush-
ing wear as a maintenance consideration.
The only time internal pin and bushing
wear can occur is when a track joint loses
its lubricant. If a track joint goes dry on a
machine with elevated sprockets, internal
pin and bushing wear may soon become
critical. Therefore, on the elevated sprocket
tractors, we recommend that operators
inspect the track weekly for dry joints. Use
the procedure on page 101 of this section.
Links
See pages 28 through 35 for detailed link
information.
Measurement — Measure the track link
over the centerline of the pin and bushing
bores. See page 28 for details.
Link Allowable Wear — Two-level allow-
able wear percent worn charts are provided
for the D8 through D11. The high impact
column should be used for machines which
could experience link structural failure due to
extremely high link rail projected wear life.
The low-moderate impact column should
be used for all other conditions. As an
example, you may learn that for some appli-
cations/underfoot conditions in your territory,
the D10N link will have structural problems
at 8-9,000 hours. For these machines, if the
projected link life using the low impact chart
exceeds 8-9,000 hours, the high impact
percent worn column should be used.
99
COMPONENTS
Elevated Sprocket Machines