Great Plains NP4000 40-foot Operator Manual - Manual (Page 57)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 53
2012-03-28 Table of Contents Index 407-776M
Application Height Adjustment
Fertilizer release height is normally at or just above the
ground, and is controlled by three adjustments:
Refer to Figure 32
1.
Tool bar height:
This affects coulter depth. The procedure for setting
tool bar height varies with hitch type:
See page 55
2. Fertilizer arm height (page 54):
This affects arm height relative to the coulter.
This adjustment is primarily to compensate for blade
wear.
3. Coulter height (page 54):
This affects coulter height relative to the tool bar, and
is normally not adjusted.
Factory settings:
25 in. (63.5 cm) above ground at 4 in. coulter depth
7.5 in. (19.1 cm) coulter shank distance
1 in. (2.5 cm) release height
Coulter Force
In normal operation at target running depth, the spring is
at full extension or only slightly compressed. It
compresses briefly as obstructions and denser soil are
encountered.
Coulter springs are set to 400 pounds (181 kg).
In normal operation at target running depth, the spring is
at full extension. It compresses briefly as obstructions
are encountered.
• In heavy no-till conditions, you may observe the
springs in compression most of the time. This means
that the blades are not reaching the desired coulter
depth. If drill weight is available, you can increase the
spring down-force to compensate.
• In light but rocky conditions, the factory spring setting
may be higher than needed. You can extend blade life
by reducing the force at which the blades ride up over
obstructions.
• Implement weight, in almost all applicator
configurations, is generally sufficient to load the
coulters to the full 400 pound factory setting.
Setting all springs above 400 pounds might require the
optional weight kit with some lighter triple-coulter
configurations.
To adjust the coulter spring:
Refer to Figure 32
1.
Raise the drill and install transport locks.
See “Raising/Lowering Applicator” on page 35.
2. Determine the new spring length desired.
3. Measure the current length of the spring(s) to be
changed. If already as short as 9
3 ⁄
4
in. (24.8 cm), or
as long as 10
1 ⁄
4
in. (26 cm), do not further adjust
them.
4. Loosen the jam nut .
5. Rotate the adjuster nut until the spring is at the
new length. Tighten the jam nut.
Note: If all springs are continuously in compression, the
coulters can lift the wing frames off the ground (at
the gauge wheels), resulting in uneven coulter
depth and/or uneven seed depth. If the drill is
already operating at maximum down-pressure,
reduce coulter depth.
Figure 32
Vantage I 20in Coulter
31655
2
1
4
3
6
7 5
5
Spring Length Force at Blade
10.25in (26.0 cm) 300 lbs. (136 kg)
10.0in (25.4 cm) 400 lbs. (181 kg)
9.75in (24.8 cm) 525 lbs. (238 kg)
31197
6
7