Great Plains NTA2007HD Operator Manual - Manual (Page 99)

Great Plains Manufacturing, Inc. Contents Index Adjustments 95
04/04/2011 Contents Index 166-283M
Marker Extension Adjustment
At delivery, marker extension is typically still set for ship-
ment (arm fully retracted), and needs to be set. Marker
extension needs to be checked periodically thereafter,
and needs to be checked and adjusted when:
• tool bar height is changed,
• marker disk angle is changed, or;
• marker disk throw direction is changed.
Refer to Figure 84
Measure marker extension
in representative field con-
ditions, with openers in ground, after adjusting tool bar
height (page 81) and wing weight transfer (page 85). If
openers are not at planting depth when setting exten-
sion, the pass gap will be too large during planting.
Marker extension is measured on the ground, from the
centerline of the outside row unit to the disk mark.
For limited down-flex drills, setting marker extension is
straightforward. On these drills the row spacing does not
change at wing gaps. The marker extension is simply
one half the span (distance between end rows) plus a
pass gap of one row space.
For standard drills, with higher down-flex, marker exten-
sion is the same, but row spacing at the wing gap is
21.6cm (8.5in), for all models. This increases the swath
by one or two percent, or put another way, increases the
swath-averaged row spacing of the drill.
The table at right presumes that the pass gap is set to
the nominal row spacing for all models. It shows the
actual swath for both wing types, and effective row spac-
ing for higher down-flex drills. For most accurate seed
monitoring, use the Swath and Avg.Spcg. data at right.
To change marker extension, on a lowered drill:
Refer to Figure 84 and Figure 85
1.
Fully extend a marker.
2. Pull forward approximately 2m (7 ft.), to leave a mark
and a furrow.
3. Loosen the jam nuts and set screw bolts secur-
ing the outer marker arm.
4. Slide the outer arm in or out until the disk is at the
desired extension distance.
5. Re-secure the set screws and jam nuts.
6. Fold the marker.
Sharp Object Hazard:
Marker disks may be sharp. Use caution when making adjust-
ments in this area. If removed, always re-install guard above
marker disk.
Null4:
Figure 84
Measuring Marker Extension
31178
3
Limited Down Flex Wing - Marker Extension
NTA607HD NTA2007HD
-3275 -4006 -3275 -4006
Pass Gap 19.1 cm 15.2 cm 7.5 in 6.0 in
Extension 314.3 cm 312.4 cm 123.8 in 123.0 in
Swath 609.6 cm 609.6 cm 240.0 in 240.0 in
Standard Wing - Marker Extension
NTA607HD NTA2007HD
-3275 -4006 -3275 -4006
Pass Gap 19.1 cm 15.2 cm 7.5 in 6.0 in
316.9 cm 318.8 cm 124.8 in 125.5 in
Swath 614.7 cm 622.3 cm 242.0 in 245.0 in
19.2 cm 15.6 cm 7.56 in 6.13 in
Extension¹
Avg.Spcg.
¹ Pass gap = nominal row spacing
3
3
Null4:
Figure 85
Marker Set Screws
31199
4
5
4 5