Frame-mounted coulter force – Great Plains NTA2007 Operator Manual User Manual
Page 97
Great Plains Manufacturing, Inc.
Adjustments
93
2012-01-05
166-372M
Frame-Mounted 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 181 kg (400 lbs). 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.
To adjust the coulter spring:
Unfold implement. Configure implement for
maintenance lift lock (page 110).
2.
Determine the new spring length
desired. See the
table at right.
3.
Measure the current length of the spring(s) to be
changed. If already shorter than 248mm (9
3
⁄
4
in), or
longer than 260mm (10
1
⁄
4
in), 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.
Machine Damage Risk:
Do not use spring lengths shorter than 248 mm (9.75 in).
It may contribute to premature parts failure not covered by
warranty.
Figure 72
Frame-Mounted Coulter Spring
27139
Spring Length
Force at Blade
26.0 cm (10.25in)
136 kg (300 lbs.)
25.4 cm (10.0in)
181 kg (400 lbs.)
24.8 cm (9.75in)
238 kg (525 lbs.)
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