Rollers Roller Position
Model Per Side F 2 3 45678910
D4H, D4H XL, 7 S DS DS DS
D4H LGP
D5M, D5M XL,
D5M XR,
D5M LGP, D5N,
D5N XL
D4H LGP 8 S DS DDS DS
D5M LGP,
D5N LGP
D5H 6 S DS S DS
D5H XL, 7 S DS DS DS
D5H TSK
D6M, D6N
D5H LGP 8 S DS DDS DS
D6M LGP,
D6N LGP
D6H, D6R 6 S DS DS S
D6H XL, D6H XR 7 S DS DS DS
D6R XL, D6R XR,
D6R XW
D6H LGP, 8 S DS DDS DS
D6R LGP
D7H, D7H LGP 7 S DS DSDS
D7R, D7R LGP
D7H XR, D7R XR 8 S DS DDS DS
D8L*, D8N*, D8R* 8 S S D DDDSS
D9L*, D9N*, D9R* 8 S S D DDDSS
D10*, D10N*, D10R*8 S SD DDDSS
D11N*, D11R* 8 S SD DDDSS
561H, 561M, 561N 7 S DS DS DS
572R 7 S DS DS DS
578* 10 S S D DDDDDSS
583R* 7 DDS S DDS
589* 10 S S D DDDDDSS
517, 527 7 S DS DS DS
517, 527 8 S DS DDS DS
*Machines where single flange rollers are larger than
double flange rollers.
Sprockets
Measurement — To determine the
sprocket segment percent worn, measure
the minimum distance between a drive
side on the original tooth and the opposite
drive side of a sprocket tooth located three
teeth away. It is important to note that the
distance measured should be between
teeth on the same segment. Avoid measur-
ing between teeth on different segments as
this may yield an incorrect measurement.
Wear Patterns — The sprockets on these
machines are elevated, reducing the
effects of abrasives, packing and virtually
eliminates impact. Wear patterns exhibited
on these sprockets are similar, but not identi-
cal, to those seen on low sprocket machines.
Segment replacement is recommended at
bushing turn time to reduce back-side
bushing wear rate.
During early hour operation of elevated
sprocket tractors, contact (scrubbing) between
the track link and the side of the sprocket
segment can occur. Experience has shown
that this scrubbing is common and usually
subsides after about 200 hours of operation.
Extensive investigation indicates that the
stack up of tolerances in the components
of the roller frame and the final drive result
in the tendency for the track to favor one
side or the other of the sprocket.
Sprocket scrubbing has been observed on
many machines operating in a variety of
applications. Custom Track Services
(CTS) data showed no detrimental effect
on the wear life of the undercarriage
caused by sprocket scrubbing. A similar
type of contact (scrubbing) may also be
observed on the track guides.
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COMPONENTS
Elevated Sprocket Machines
Track-Type TractorsPipelayersTrack
Skidders