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SECTION 2 - OPERATION
2-62
1. Setting the Tire Rolling Radius
NOTE: Setting the tire radius is only
necessary when the tractor is not
equipped with the Tractor Performance
Monitor option. If the tractor being
calibrated is equipped with the
performance monitor, skip this step and
proceed to “Programming Units of
Ground Speed Measure.”
A. If the tractor is not equipped with the
optional Tractor Performance Monitor, the
upper portion of the monitor will flash
“RAD” with “SET UP” displayed when the
calibration mode is first entered. The lower
portion of the monitor will have a number
displayed with the tenth digit (0.1) flashing.
B. Without a Tractor Performance Monitor
radar unit installed on the tractor, it is
necessary to measure the rolling radius of
the tires that are installed on the tractor
and program this value into the system for
accurate displays of ground speed.
Figure 2-92
C. To measure therolling radius of the tire, the
tractor must have its duals/triples installed,
if equipped, and be properly ballasted and
inflated (See “Ballasting” later in this
section). Park the tractor on a flat surface
and apply the park brake. Take a tape
measure and accurately measure the
distance from the center of the level plug,
1, (located next to the axle oil level sight
gauge) to the ground on the front and rear
axle. The measurement must be taken
from the exact center of the level plug.
Record these measurements.
Figure 2-93
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