Great Plains 3S-4000F Operator Manual - Manual (Page 72)

68 3S-4000 Table of Contents Index Great Plains Manufacturing, Inc.
195-394M Table of Contents Index 2014-06-10
Marker Extension
Refer to Figure 82
To adjust marker extension, loosen
3 ⁄
8
inch U-bolt ,
lock washer and hex nut . Move marker disk tube
in or out to get the proper adjustment.
To measure for marker width adjustment:
1. Lower drill in the field and drive forward a few feet.
2. Measure from the middle of the outside row to the
mark in the ground made by marker disk.
3. Adjust as needed.
Marker Setup
Refer to Figure 83
Markers are field-installed, but usually do not have their
extension length precisely set. The drill must be leveled
per “Leveling the Drill” on page 17, and marker(s) must
be in correct working order.
Row unit centerline stations on 3S-4000 drills are
symmetrical about machine center, so left and right
extensions are normally identical, for both opposing and
concentric passes.
Set the initial length of the marker(s) as follows:
1. Lower drill and openers to field position (“Raising
and Lowering Openers” on page 34).
2. Extend a marker on one side. Pull forward several
feet to leave a mark.
3. Sighting parallel to the main tool bar, measure from
the centerline of the outside row unit to the mark.
4. Adjust the marker extension so that the mark is
one half the span plus one row unit spacing .
5. Pull forward several feet, and re-measure to verify
any adjustment. Validate the mark by making a pass
to one or both sides.
6. Fold marker. Extend other side and adjust.
Note: If field conditions require inverting the marker disk
(page 67), the mark moves, and the extension
needs to be re-measured and reset. Marking also
changes slightly if the opener frame trunnion
position is changed.
Model Spacing Extension
3S-4000-4810 10 in
245.0in
(622.3cm)
3S-4000-6375 7.5 in
242.0in
(614.7cm)
3S-4000-7806 6 in
240.5in
(610.9cm)
Figure 82
Marker Width Adjustment
18878
1
2 3 4
Figure 83
Marker Extension
R
E
H
S E
H S R
R E