John Deere OMPFP10808 - Manual (Page 29)

Setup
JS56696,0000506 ­19­09DEC08­2/3
JS56696,0000506 ­19­09DEC08­3/3
Adjusting Lateral Offsets
If TCM’s have been properly calibrated and machine or
implement still cannot track on same line going both
directions, a lateral offset should be entered.
NOTE: Remember, when checking bias on machine,
use AutoTrac. When checking bias on
implement, use iGuide.
1. The offset will be half the distance the two paths were
offset and in the same direction.
2. When entering lateral offset for implement, enter a
GPS offset on GPS offsets page.
3. Remember, when looking at tracks on the ground,
machine and implement must be symmetrical. Tires
must have same spacing from center of machine or
implement.
4. Another way of getting the correct lateral offset for the
implement is to measure guess rows. This method will
work with the implement in the ground and will also
achieve good guess rows.
Before measuring guess rows, make sure row units
are correctly spaced from center of implement.
Make three adjacent passes (preferably in straight
track mode with iGuide on). Make sure passes are
long enough so system has time to become stable.
Measure distance between guess rows in the middle
of pass.
NOTE: Do not measure the ends of the passes.
NOTE: Wheels must be accurately spaced on vehicle
axles. This is critical for calibration accuracy .
PC1
1507
—UN—09DEC08
Lateral Offsets
A—Second Pass B—First Pass
5. Implement GPS Lateral Offset Example— Using
the Lateral Offsets 2 graphic and trying to get 762
mm (30 in.) guess rows. The guess row that is too
narrow (overlap), was measured at 64 cm (25 in.).
The wide side guess row was measured at 89 cm (35
in.). Therefore a 6.4 cm (2.5 in.) GPS offset to the left
(narrow side) should be entered in the GPS Offsets
page.
PC1
1067
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Lateral Offsets 2
15­16 102110
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