Great Plains NP30A 30-foot Operator Manual - Manual (Page 97)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 93
2014-05-20 Table of Contents Index 407-502M
Anhydrous Coulter Application Depth
Refer to Figure 75
Tine release depth
is set by tool bar height above
the ground, coulter shank height and tine height .
Chemical Hazard:
Adjust height dry. Make adjustments before charging the
metering system with anhydrous ammonia, or after thoroughly
discharging the system. With the tines out of the ground, there
could otherwise be releases of ammonia at dangerous
concentrations.
Tool bar height is controlled by the tractor hitch in the
center section. Wing tool bar height is set to match the
center using a crank-assisted manual adjustment
(page 86).
Tine height is adjusted at the mount . This requires
adjustment as the coulter blades wear. Loosen the nuts
on the U-bolts
. Lower the shank and re-tighten.
Design coulter operating depth is 3 to 7 in (7.6 to 18 cm).
Operation below 7 in (18 cm) is not recommended, as
high rates of disc wear are likely.
Application depth is unaffected by the coulter spring
(page 96) and sealer spring
(page 99) settings.
Anhydrous Coulter Reference Information
These are the factory settings.
Shank height below tool bar is:
11
11 ⁄
16
in (29.7 cm)
Overall height of the tool bar base to coulter edge is:
32
9 ⁄
32
in (79.5 cm)
At factory settings, NH
3
is released from the tube at:
3 ⁄
8
in (9.7 mm) above the lower coulter edge.
For a precise release depth, subtract this amount from
the total coulter depth
.
Figure 75
NH
3
Application Depth
34929
3
1
2
7
4
8
5
9
s
6
1 2
3 4
4 5
6
9
s
3
7
4
8