Great-plains NTA2007HD Operator Manual User Manual download pdf (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

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

Null4:

Figure 85

Marker Set Screws

31199

4 5

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 177 178

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