Shoes
See pages 51 through 55 for detailed shoe
information.
Measurement — Use the depth gauge or
the Ultrasonic Wear Indicator to measure
shoes.
Shoe Width — Wide track shoes are a
major cause of undercarriage component
failures and dry joints. See page 12 for a
detailed discussion of the effects of wide
track shoes.
Idlers
See pages 56 through 58 for detailed idler
information.
Measurement — Use the depth gauge to
measure both treads of the idler. Use the
same depth gauge probe positions as you
use for rollers, but do not use the reference
hooks. For D8 through D11 tractors,
position the bar so two posts are over each
tread and press the bar down. Measure the
length of all four posts and use the largest
measurement to determine percent worn.
For D4 through D7 tractors, position the
bar so that one probe is over the center of
each tread. Use the average measurement
to determine percent worn.
Idler Swapping — In some situations,
wear between front to rear or left to right
idlers may be uneven. If this occurs,
follow the guidelines on page 56 to deter-
mine if a swap is necessary.
Due to differences in front and rear idler
diameters, swapping is not possible on the
D4H, D4H XL, D5M XL, D5N XL, D6H
(serial number ranges 1KD402-661,
2TG1-543, 3YG1-556, 4GG1-465, 5HG1-
441, 8FC1-717, 8FC461-964, 8YC473-
UP), D8N, and D8R.
Idler Guard Wear Packages for D8R,
D9R, D10R, D11R — Increase link, roller
and idler wear life by up to 40% by
installing flexible rubber idler guards.
These guards are for use in moderate to
high abrasive and low impact underfoot
conditions. They work by preventing
abrasive material from entering the under-
carriage system. For details, reference
IRM UC01-06 (PELM1002).
Track Rollers
See pages 61 through 65 for detailed track
roller information. The following points are
specifically for elevated sprocket tractors.
Measurement — For D8 through 11
tractors, measurement of track rollers must
be done using the depth gauge or the
Ultrasonic Wear Indicator. Calipers are not
feasible due to close roller spacing. The
depth gauge, calipers or the Ultrasonic
Wear Indicator may be used on D4 through
D7 tractors.
For D8 through D11 track rollers, set the
farthest probe on the measurement tool as a
reference hook. Set the probes in the appro-
priate holes for the model being measured.
Position the bar across the roller so the ref-
erence hook is against the outside of the
outer flange and the probes are resting on the
grooves of the roller. These rollers develop
wear grooves as explained on page 62.
Push the bar down flush with the flanges.
Then measure the exposed length of all four
probes and use the average measurement
102
COMPONENTS
Elevated Sprocket Machines