Wear Patterns — See pages 29 through
32 for a detailed discussion of link wear
patterns.
Split Master Links — Use the assembly
procedures on page 33 for split master
links. Refer to “Shoes” on the following
page for bolt torque specifications.
Bushing — Sealed &
Lubricated Track
Measurement — Use the caliper, depth
gauge or Ultrasonic Wear Indicator to
measure the vertical position to the closest
0.01" (0.25 mm). The vertical position is
expected to be the most worn position for
Sealed and Lubricated Track bushings on
low sprocket machines. Measurement of
other wear positions can be made, but are
not expected to be critical.
Bushing Allowable Wear — Bushing
allowable wear is based on the remaining
strength to resist cracks. For high impact
underfoot conditions use lesser allowable
wear. For low impact use greater allow-
able wear.
Dry Joints
See page 42 for dry joint inspection proce-
dures and recommended service. If a dry
joint is found, measure pitch extension
over that one joint. Schedule service if the
pitch exceeds these limits:
New Track Single Joint
Model Pitch Wear Limit
D3 6.125" (155.6 mm) 6.50" (165 mm)
D4
931
933
935
D4 6.75" (171.5 mm) 7.25" (185 mm)
941
D5 6.91" (171.5 mm) 7.50" (190 mm)
951
955
561
D6 8.00" (203.2 mm) 8.67" (220 mm)
955
D7 8.50" (215.9 mm) 9.12" (321 mm)
977
571
572
D8 9.00" (228.7 mm) 9.75" (250 mm)
983
D9 10.25" (260.4 mm) 11.00" (280 mm)
594
Bushing — Sealed Track
— External
Measurement — To measure external
wear use the caliper or the Ultrasonic Wear
Indicator. Measure the minimum diameter
regardless of the position (vertical, forward,
reverse). See details on measurement pro-
cedures, page 44.
251
COMPONENTS
Low Sprocket Machines