Great Plains NTA2007 Operator Manual - Manual (Page 37)

Great Plains Manufacturing, Inc. Table of Contents Index Preparation and Setup 33
2012-01-05 Table of Contents Index 166-372M
Checking Drill Height
The drill is designed to operate with all sections of the
main tool bar nominally:
65cm (25
1 ⁄
2
in) above the planting surface, at a
planting depth of:
3.8cm (1
1 ⁄
2
in), and a
coulter (option) depth of:
5.1cm (2in).
Refer to Figure 18
Tool bar height is measured to the bottom of the tool bars
on which the row units are mounted.
At the suggested default setting, the implement frame is
level with the ground during planting, and the row units
operate at their most consistent planting depth.
Your crop, soil conditions, disc wear and other factors
may create a need to use a different tool bar height.
Refer to Figure 19
Tool bar height is set via combinations of spacer
bushings on the rods of the master lift cylinders
ahead
of the implement centre section, described on page 86.
The wing end tool bar heights are controlled by slave
cylinders that stop retracting when the master cylinders
stop. Only weight transfer adjustment is usually required
for wing height (although eye bolt adjustment is
available).
When checking tool bar height:
1. Move the drill to representative planting soil
conditions.
2. Set hitch to planting height (page 32).
3. Unfold and lower the implement (page 35).
4. Pull forward a meter or so (a few feet) to put openers
in ground.
5. Check tool bar height across drill.
6. If centre section is not at desired height, see
“Adjusting Tool Bar Height” on page 86.
7. If wing tool bar heights do not match centre section,
this usually means that wing weight transfer needs to
be set or adjusted. See see “Weight Transfer
Adjustments” on page 90 before considering an eye
bolt adjustment (page 133).
Marker Setup
Prior to first use, set or review marker extension and
tension. See:
• “Marker Adjustments” on page 99.
Prior to each planting session, check and adjust:
• “Marker Disc Adjustment” on page 101.
Measurement Error Risk:
Drill must be fully lowered to field position (with openers into
ground) and hitch height must be set before checking tool bar
height.
Figure 18
Tool Bar Height Check
31130
1
Figure 19
Master Lift Cylinder Spacers
31226
1
1