Great Plains NTA2007 Operator Manual - Manual (Page 104)

100 NTA607 or NTA2007 Table of Contents Index Great Plains Manufacturing, Inc.
166-372M Table of Contents Index 2012-01-05
Marker Extension Adjustment
At delivery, marker extension is typically set for shipment
(arm fully retracted), and needs to be reset for field.
Marker extension needs to be checked periodically
thereafter, and needs to be checked and adjusted when:
• tool bar height is changed,
• marker disc angle is changed, or;
• marker disc throw direction is changed.
Refer to Figure 83
Measure marker extension
in representative field
conditions, with openers in ground, after adjusting tool
bar height (page 86) and wing weight transfer (page 90).
If openers are not at planting depth when setting
extension, the pass gap will be too large during planting.
Marker extension is measured on the ground, from the
centre-line of the outside row unit to the disc 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
extension is the same, but row spacing at the wing gap is
216 mm (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
spacing 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 83 and Figure 84
1.
Fully extend a marker.
2. Pull forward approximately 2 m (7 ft.), to leave a
mark and a furrow.
3. Loosen the jam nuts and set screw bolts
securing the outer marker arm.
4. Slide the outer arm in or out until the disc is at the
desired extension distance.
5. Re-secure the set screws and jam nuts.
6. Fold the marker.
Sharp Object Hazard:
Marker discs may be sharp. Use caution when making
adjustments in this area. If removed, always re-install guard
above marker disc.
Figure 83
Measuring Marker Extension
31178
Limited Down Flex Wing - Marker Extension
NTA607 NTA2007
-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
NTA607 NTA2007
-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
32159
Extension¹
Avg.Spcg.
¹ Pass gap = nominal row spacing
3
3
3
Figure 84
Marker Set Screws
31199
4
5
4 5