
SEBU7494-06 131
Maintenance Section
Sprocket - Inspect
g01152685
Illustration 161
(1) Date of in
stallation (retractor)
(2) Date of in
stallation (buckle)
(3) Date of m an
ufacture (tag) (fully extended web)
(4) Date of man
ufacture (underside) (buckle)
Consult your Caterpillar dealer for the replacement of
theseatbelta
nd the mounting hardware.
If your machine is equipped with a seat belt
extension, a
lso perform this replacement procedure
for the seat belt extension.
i02110179
Sprocket - Inspect
SMCS Code: 41
64-040
Note: Operating the machine in conditions t hat are
extremely mu
ddy or sandy will cause accelerated
wear on the drive sprocket and other undercarriage
components. It is important to clean the undercarriage
of the machi
ne daily in order to maximize component
life.
In order to s
ervice the drive sprocket, the tracks must
be removed. Refer to Operation and Maintenance
Manual, “Track (Rubber) - Remove/Install”.
Sleeves
g00801623
Illustration 162
The drive sprocket is equipped with two types of
sleeves. The inner sleeves (2) are held in position
by the rings of the sprocket (4) and (5). The outer
sleeves (3) are free to rotate on the inner sleeves.
Measure thickness (A) for the outer sleeves. If the
thickness of the outer sleeves measures less than
the minimum thickness that is listed in the following
table replace the sleeves.
Note: When you replace the outer sleeves, rotate
the inner sleeves for 180°. If the inner sleeves have
already been rotated, replace the inner sleeves.
Table 21
247, 257, 267, 277, and 287
Component
Minimum Thickness
Outer Sleeve 3mm(0.12inch)
Rings
The inner rings (5) and the outer rings (4) of the
drive sprocket will wear from the rotation of the outer
sleeves. Measure the thickness (B) of the inner rings
and outer rings. If the thickness of the inner ring or
outer ring measures less than the minimum thickness
that is listed in the following table replace the ring.