Introduction
The D8R through D11R use an exclusive
undercarriage design to increase machine
productivity and improve serviceability.
The bogie mounted rollers and idlers
allow for better traction, reduced impact
loading and a better ride. The result is
greatly increased productivity.
Elevated sprockets on D4H through D11R
remove the final drives from abrasives and
damaging implement loads. Final drive life
has doubled and steering clutch/brake life
has nearly tripled. Final drive repair times
are shorter because roller frames do not
have to be removed. For example, D9L
final drive modules can be removed and
installed in only five hours versus 45 hours
on a D9H or Komatsu D355.
This innovative design results in under-
carriage wear patterns different from those
found on low sprocket track-type tractors.
Different wear patterns require different
management guidelines. These guidelines
are reviewed on the following pages.
Link Assembly Identification
Code Markings
A uniform identification marking system
has been adopted to improve follow-up
reporting and warranty tracking of link
assembly performance. For all models,
locate the second full link from the
bushing end (prior to 1991, the pin end) of
the master link. The identification code is
stamped on the shoe pad surface on the
right hand link (as viewed during track
press work).
The code is alpha-numeric (eg. AC210Y04).
For details of code interpretation see IRM
UC87-30.
96
INTRODUCTION
Elevated Sprocket Machines
Undercarriage Identification
The easiest way to identify track is to read the part number forged into the link. The fol-
lowing list cross references link part numbers to the wear chart pages.
Model Pitch Link Part Number Wear Chart Pages
D4H 6.75" (171.5 mm) 108-0947 & 48 110-129
D5M, D5N 6Y9261 & 62
561M, 561N
D5H 7.50" (190.5 mm) 106-1625 & 26 130-147
D6M, D6N 6Y9267 & 68
517
D6H, D6R 8.00" (203.2 mm) 8E7405 & 06 148-166
527 8E2355 & 56
195-6515 & 16
D7H, D7R 8.50" (215.9 mm) 6I9239 & 40 168-187
572R 9G2417 & 18
D8L, D8N, D8R 8.50" (215.9 mm) 8E4505 & 06 188-201
578 8E4513 & 14
583R
D9L 9.00" (228.6 mm) 7T7629 & 30 212-219
589 7T4137 & 38
D9N, D9R 9.45" (240 mm) 7T2275 & 26 202-211
9W2743 & 44
D10 10.25" (260.4 mm) 9W5723 & 24 228-235
9W5933 & 34
D10N, D10R 10.25" (260.4 mm) 7T0715 & 16 220-227
9W5265 & 66
D11N, D11R 12.50" (317.5 mm) 200-6325 & 26 236-244
6T8049 & 50