Frame-mounted coulter force – Great Plains 3S-4010HDF Operator Manual User Manual
Page 44
40
3S-4010HD and 3S-4010HDF
Great Plains Manufacturing, Inc.
196-522M
03/28/2012
E
Frame-Mounted Coulter Force
In normal operation at target running depth, the spring is
at full extension or only slightly compressed. It com-
presses briefly as obstructions and denser soil are
encountered.
Coulter springs are set to 400 lbs (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 adequate 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:
Raise the drill and install transport locks. See “Rais-
ing” on page 20.
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 9
3
⁄
4
in (24.8cm), or
longer than 10
1
⁄
4
in (26cm), 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 high forces are
required, frame weights are probably required.
FigureSpacer:
FigureSpacer:
Machine Damage Risk:
Do not use spring lengths shorter than 9.75 in (24.8 cm). It
may contribute to premature parts failure which will not be
covered by warranty.
Figure 45
Frame-Mounted Coulter Spring
27139
Spring Length
Force at Blade
10.25 in (26.0 cm)
300 lbs (136 kg)
10.00 in (25.4 cm)
400 lbs (181 kg)
9.75 in (24.8 cm)
525 lbs (238 kg)
1
1
2
3