Pin Boss End - Guiding Guard Wear
CAUSES: Sliding contact between pin
boss ends and guiding and roller guards.
ACCELERATORS: Same as rail side wear.
EFFECT: Reduces pin retention and there-
fore limit rebuildability.
REMEDIES: Reduce or eliminate all control-
lable accelerators related to loads conveyed
from shoe to link, keep bolts properly torqued
and use narrowest shoe possible.
Link Structural Problems
Rail Spalling
CAUSES: Repeated high impact contact
with roller treads and/or flanges.
ACCELERATORS: Impact, Machine
Speed, Horsepower, Weight: too wide
shoes, and tight track.
EFFECT: May reduce wear life rebuild-
ability if over 30 percent of rail surface is
affected otherwise only a cosmetic effect.
REMEDIES: Reduce or eliminate control-
lable Accelerators, particularly too wide
shoes that add weight and leverage loads
on uneven terrain.
Link Cracking
CAUSES: Repeated twisting of link.
ACCELERATORS: Same as “Rail Spall-
ing” plus degree of rail material worn
away. The biggest accelerator is shoes that
are too wide.
EFFECT: Shorten link assembly life, track
separation if cracked through and prevents
rebuilding.
REMEDIES: Reduce or eliminate control-
lable accelerators particularly too wide
shoes and tight track.
Pin & Bushing Bore Enlargement
CAUSES: Bore material broached out
during assembly and/or disassembly; plus
material worn out during sliding movement
of flexing pins and bushings.
ACCELERATORS: Same as “Rail Spalling”
plus material worn off of pin bosses. The
biggest accelerator is shoes that are too wide.
REMEDIES: (1) Improved track press
alignment and tooling to prevent broach-
ing during assembly and disassembly. (2)
Reduce or eliminate controllable accelera-
tors especially too-wide shoes and tight
track.
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General Information