Frame-mounted coulter force – Great Plains YP40F Operator Manual User Manual
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YP2425F/YP4025F
Great Plains Manufacturing, Inc.
403-362M
2013-03-25
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 implement weight is sufficient, 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:
Refer to Figure 18
1.
Raise the planter and install transport locks.
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 24.8cm (9
3
⁄
4
in), or
longer than 26cm (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 planter is
already operating at maximum down-pressure,
reduce coulter depth.
Machine Damage Risk:
Do not use spring lengths shorter than 24.8 cm (9.75 in). It
may contribute to premature parts failure which will not be
covered by warranty.
Figure 18
Frame-Mounted Coulter Spring
27139
Spring Length
Force at Blade
26.0 cm (10.25 in)
136 kg (300 lbs)
25.4 cm (10.00 in)
181 kg (400 lbs)
24.8 cm (9.75 in)
238 kg (525 lbs)
1
1
2
3