Roller Flange Wear
CAUSES: Track Rollers inner flanges
and/or carrier roller flanges contacting
bushing due to one or more of (a) links (b)
carrier rollers or (c) track rollers being
well past 100 percent worn.
ACCELERATORS: All load variables.
EFFECT: Causes bushing to be prema-
turely worn to limit.
REMEDIES: (1) Turn bushing on or before
100 percent worn in these positions. (2)
Rebuild, swap or replace carrier rollers
shells or roller shells.
NOTE: Refer to pages 66 through 69 for
related discussion on sprocket wear patterns.
Sealed and Lubricated Track
Bushings Structural Problems
The destruction limitation of track bushings
is usually due to (1) wall cracking (breaking
out in the severe case) or (2) loose bushing
retention in the link. In the case of Sealed
and Lubricated Track, either of these will
result in a dry joint (lubricant loss), and in
most cases impair parts reusability.
Bushing Cracks
(Through the wall)
CAUSES: Exceeding wear limit for respec-
tive degree of impact or other criteria.
ACCELERATORS: Same as “Vertical
Position” wear pattern.
EFFECT: (1) Loss of lubricant and result-
ing internal wear. (2) Makes bushing non-
reusable in wet joint and may not be
reusable at all if a piece is broken out of a
dry joint.
REMEDIES: Re-evaluate decision to run
past wear limit.
Bushing (and/or Pin) Loose in Link
CAUSES: Loss of press-fit into link bore.
ACCELERATORS: (1) Severe repeated
impacts yield or crack link bore. (2) Link
bore broached by improper press align-
ment at reassembly time.
EFFECT: (1) Loss of lubricant. (2) Pin,
Bushing and Links not reusable in wet or
dry joint.
REMEDIES: (1) Reduce or eliminate con-
trollable variables which accelerate impact.
(2) Control track press alignment capability.
41
General Information
SEALED & LUBRICATED TRACK PINS & BUSHINGS