30
Uneven (Scalloping) Wear
on Rail Top
CAUSES: No. 1 & 3: Faster wear rate due to
reduced contact with rollers at narrower link
overlap area (also see Face Wear on page 31).
CAUSES: No. 2: Sliding wear due to reduced
contact area with idler at center of link rail.
ACCELERATORS: Same as Rail (Top)
Wear above, particularly tight track.
EFFECT: No. 1 & 3: Wear limit over pin
boss reached prematurely.
No. 1, 2 & 3: Reduces rebuildability and
causes vibration in extreme cases. Counter-
weighting machines will reduce wear. A
1/4" difference will cause a ride problem.
REMEDIES: Same as Rail Top Wear
above. Sealed and Lubricated Track will
have less wear in areas No. 1 & 3 due to no
pitch extension. Better balance will reduce
vibration and potential cracking in cab.
Pin Boss Side Wear
CAUSES: Sliding contact with guiding
and/or roller guards plus abrasives (may
be seen at either or both ends of pin —
usually more severe on outboard side).
ACCELERATORS: Uneven terrain and
side hill operation. Too-wide shoes, worn
rolling component flange, misalignment and
snaky track are main controllable variables.
REMEDIES: Eliminate or reduce control-
lable accelerator variables, particularly
snaky track by turning pins and bushings.
Rail Side Wear
(inside and/or outside)
CAUSES: Rolling and sliding contact
with roller and idler flanges.
ACCELERATED BY: Same as “Rail Top
Wear” plus uneven terrain, turning, side
hill operation, misalignment, too wide
shoes and snakiness of unsealed or Sealed
Track.
EFFECT: Reduces rail wear life to service
limit and rebuildability.
REMEDIES: Reduce or eliminate control-
lable accelerators, particularly snaky track,
tight track and too wide shoes.
Rail Inside Gouged
CAUSES: Sprocket tooth tip interfering
due to snaky track and/or misalignment of
track or sprocket (see sprocket wear).
ACCELERATORS: Side hill or uneven
terrain, turning, too wide shoes.
EFFECT: Reduced rebuildability of links
and reusability of sprocket segments if
severe.
REMEDIES: Correct controllable causes
and accelerators.
LINKS
General Information