Sealed and Lubricated Track vs
Sealed Track Effects
Due to expected absence of internal wear
the Sealed and Lubricated Track bushing
should have its most worn position on or
very near the vertical position. Sealed
Track is expected to have either forward
or reverse position as the most critical
position. The Sealed and Lubricated Track
bushing also has fewer wear positions to
analyze.
The expected life of the Sealed and Lubri-
cated Track bushing is approximately 50 per-
cent more than the Sealed Track bushing
when compared to either high or low impact
service limits.
These increases depend on the following:
1. Degree of internal wear that contri-
buted to the external wear on the
Sealed Track bushing.
2. Properly adjusted track.
3. Absence of very severe packing.
4. Similar working conditions.
Sealed and Lubricated Track
Bushing Turnability
The Sealed and Lubricated Track bushing
should be turned based on the guidelines
in following sections entirely devoted to
specific model families.
The bushing may be expected to provide
life after turn wear, equal to or exceeding
the wear life potential of the first or front
side prior to the turn.
Sealed and Lubricated Track bushings can
be successfully turned wet if there are no
cracks through the bushing wall at turn
time and seal wear life guidelines have
not, or will not, be exceeded.
Sealed and Lubricated Track bushings
may be successfully turned dry, (with or
without internal wear at turn time) as long
as there are no cracks through the bushing
wall and internal wear does not exceed
Sealed Track service limits.
Life after dry turn cannot be expressed
as a percent of wet life before turn. It will
most closely approximate life after turn
of Sealed Track in hours, not percent.
How to Interpret Sealed
& Lubricated Track
Bushing Wear Patterns
These patterns are found on wet joints. For
dimensions on wear patterns of dry joints
see Sealed Track bushings.
Vertical Position
(0° to 30° from vertical is normal expected
wear pattern)
CAUSES: Sliding contact with root of
sprocket tooth during forward to reverse
direction changes and due to pitch mismatch
from minor packing and advanced other
component wear.
ACCELERATORS: Horsepower, weight
and speed; impact, abrasiveness, tight
track and packing loads, worn rear rollers,
wide shoes and reverse loads.
EFFECT: Cracking will occur when
respective high or low impact wear limit
(100 percent worn) is exceeded. Bushing
wall will break through at destruction point.
REMEDIES: Eliminate or reduce control-
lable accelerator variables listed above and
turn bushing on or before service limit.
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General Information
SEALED & LUBRICATED TRACK PINS & BUSHINGS