For instructions on how to make measure-
ments see pages 61 - 62.
The rear two rollers on machines equipped
with sprocket guards can only be measured
in the field with the Ultrasonic Wear Indi-
cator. These rollers are critical because they
are often the most worn. It is important to
measure all rollers whenever the track is
removed for service to determine if a swap
is needed.
Roller Swapping — Higher track speeds,
increased debris entry between the sprocket
and roller frame and rear mounted engine
all contribute to increased rear roller wear
on hydrostatic loaders. Machines with
unbalanced roller wear may benefit from a
roller swap. Use the roller swap guidelines
on page 64 to determine if a swap would
be beneficial. Swapping at the bushing
turn time may extend roller service life to
the link service point reducing downtime
and customer cost-per-hour.
Sprocket and Idler Guards — Sprocket
and idler guards can extend roller life and
other components life. See discussion later
in this section for details.
Roller Flange Sequence
From the chart which follows, you will
note that the rear roller (the roller nearest
the sprocket) is a single flange roller. If a
double flange roller were used as the rear
roller, interference could occur between the
inner flange and the sprocket teeth.
Therefore, a double flange roller should
NOT usually be placed in the rear position.
Rollers Roller Position
Model Per Side F 234567
943 6 S D S S D S
953 6 S D S S D S
963 6 SDDSDS
973 7 SDDSDDS
Sprockets
See pages 66 through 70 for detailed
sprocket information. The following points
are specifically for hydrostatic loaders:
Do not reuse sprocket with turned
(or replaced) bushings
OK to use sprocket with turned
(or replaced) bushings
Measurement — Use the appropriate
sprocket reuse indicator gauge (973 —
5P8617; 943, 953, 963 — 5P8616) to
determine reusability.
All new and many older hydrostatic
loaders are equipped with sprocket guards
to reduce the entry of abrasives. Sprockets
on these machines cannot be measured in
the field. They should be inspected when-
ever the track is removed for service.
Sprocket wear is seldom a critical item.
Therefore sprockets can be inspected at
service without affecting undercarriage
management decisions.