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December 2009 |
IMPROVED 7-BOLT HOLE SPROCKET SEGMENT FOR D8R/T & D7R TRACTORS AND 587R/T & 583T PIPELAYERS
To maintain better bolt retention, two
additional bolt holes have been added to D8R/T, D7R, 587R/T and 583T sprocket
segments. Made from Caterpillar Tough SteelTM, these sprocket
segments offer extended wear life.
All D8R/T Track Type Tractors built in
Benefits
The introduction of the 7-bolt Tough SteelTM
segment allows better retention in applications where retention is an issue due
to bolt loosening.
D8T/R and Pipelayer Changes
An improved sprocket segment is now
used on new D8R/T, 587R/T and 583T
machines. The new segment and final drive hub use seven mounting bolts instead
of five to improve sprocket segment retention. All factory built D8R/T tractors,
and 587R/T and 583T pipelayers now use seven bolts to mount the new segment to
the final drive hub.
?
When installing
the new 7-bolt segment onto hubs with a 7-bolt pattern, install all seven bolts.
?
When installing
the new 7-bolt segment onto hubs with a 5-bolt pattern, either install only five
bolts or rework the hub to the 7-bolt hole pattern and install all seven bolts.
If sprocket segment loosening is not an issue with the existing 5-bolt pattern,
it is not necessary to rework the final drive hub to a 7-bolt pattern.
?
When installing
D8 SystemOne undercarriage, it is recommended that only the 7-bolt mounting be
used.
|
New 7-bolt Sprocket Segment P/N |
New 7-bolt Sprocket Hub P/N |
Former 5-bolt Sprocket P/N |
Former 5-bolt Sprocket Hub P/N |
Description |
|
318-6248 |
278-2363 |
8E-2481 |
D8R/T, 587R/T, 583T with PPR Track |
|
|
278-2375* |
318-6248 |
278-2370 |
-- |
D8R/T with SystemOne track |
All
segments use the following hardware: 5P-7665 bolt, 7H-3608 nut, 6V-5841 washer.
Tighten bolts to 300 +/- 50 N-m (220 +/- 37 ft-lb) plus 1/3 turn.
Effective Dates
The new 7-bolt sprocket segment is available out of the
It is
effective with the following machines:
D8T ?
D8R ? S/N 9EM5225-UP
587T ? S/N FAT486-UP
587R ? S/N BXL431-UP
583T ? S/N
CMX482-UP
D7R machines from the factory now use the same 7-bolt
sprocket segment as described above. However, the D7R final drive hub only has
five bolt holes. Only five bolts are required to properly retain the sprocket.
Pipelayers. The segment was
released in order to improve the retention of the sprocket segment on D8R and
D8T machines. However, segment loosening has not been an issue with D7R
machines. It is not necessary to rework the final drive hub to the seven bolt
pattern unless there are segment retention issues.
|
New 7-bolt Sprocket Segment P/N |
New 7-bolt Sprocket Hub P/N |
Former 5-bolt Sprocket P/N |
Former 5-bolt Sprocket Hub P/N |
Description |
|
N/A |
278-2363 |
7G-5837
180-7920 |
D7R
with Heavy Duty Track |
All segments use the following hardware: 5P-7665 bolt,
7H-3608 nut, 6V-5841 washer. Tighten bolts to 300 +/- 50 N-m (220 +/- 37 ft-lb)
plus 1/3 turn.
The
change is effective with the follow machines:
D7R ?
Reference
REHS3373 ? ?Converting D8N, D8R and D8T to SystemOne Undercarriage?, under the
section titled ?Drill Bolt Holes in the
Contact Information
Todd Borrowman
Caterpillar Inc.
Core Components Division
Product Manager- Undercarriage Marketing
Phone: (309) 675-2013
Email: Borrowman_Todd_H@cat.com
Customer Information Center
Toll Free: (877) 228-2420
International: (309) 578 ? 6298
E-mail:
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