Great Plains NP4000B Operator Manual - Manual (Page 90)

86 2013+ NP4000/A/B Table of Contents Index Great Plains Manufacturing, Inc.
417-199M Table of Contents Index 2014-05-14
Row Adjustments
Anhydrous Coulter Application Depth
Applies to model NP4000A/B only.
Refer to Figure 55
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 91).
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 131) and sealer spring
(page 87) settings.
Depth 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
.
Anhydrous Coulter Castering
Coulters may be operated locked in-line, or with limited
free castering.
Refer to Figure 56
To lock the coulter, loosen the jam nut at
. Align the
coulter front to back. Tighten the set screw at , then the
jam nut.
To unlock the coulter, loosen the jams nut at . Loosen
the set screw bolts at , then tighten the jam nuts.
Note: Do not loosen the stop bolts .
Figure 55
NH
3
Application Depth
34929
3
1
2
7
4
8
5
9
s
6
1 2
3 4
4 5
6
b
b
a
Anhydrous Coulter Blade Wear
Blade wear is normal and the rate of wear varies with
field conditions and operating depth. Consider replacing
the blade when the initial diameter has been reduced by
1 to 2 inches.
Note: Although a nominal 22 inches in diameter, blades
are lightly larger.
Figure 56
Anhydrous Coulter Castering
34929
9
s
3
7
4
8
a
a
a
a
b