Great Plains 3N-4025P Operator Manual - Manual (Page 35)

4/23/2010 196-286M
33 Adjustments
Weights
Transport Hazard. Adding more than the recommend
weight to the drill frame could cause a tire to blow dur-
ing transport, leading to a serious road accident and
personal injury. Do not add more than 2000 pounds to
the drill frame.
If more weight is required for coulters to penetrate
the soil, weight bracket kits are available from your
Great Plains dealer. Refer to “Dual Weight Brack-
et,” page 87 for part number and ordering
information.
Refer to the chart for the results of adding weights
to your drill. Always add an equal amount of
weight to each frame section.
NOTE: Markers and seed will add weight to the
drill.
Refer to the charts for the results of adding
weights to your drill. Always add an equal amount
of weight to each wing section.
Coulter Springs
The coulter spring length is preset at 10 inches,
giving the coulter an initial operating force of 400
pounds. This setting is adequate for many difficult
no-till conditions. For lighter no-till conditions
where rocks or other obstructions are a problem,
you can lengthen the springs to protect the
coulters from impact. In heavier conditions, short-
ening the spring will increase coulter force. Refer
to the chart below for adjusting the coulter
springs.
NOTE: Any attempt to reset the coulter spring
length shorter than 9 3/4 inches may contrib-
ute to premature failure of parts and warranty
will be voided. If additional force is necessary,
add weights to the implement.
Individual Coulters
Refer to Figure 23
When coulters follow in tire tracks and do not give
satisfactory depth, individual coulters can be low-
ered by loosening the mounting clamps and
adjusting the coulter to the desired setting.
To retighten clamps, snug the hex-head clamp
bolts (1) just until the u-bolts are tight on each side
of the spring bar. Tighten nuts on u-bolts (2), then
finish tightening the hex-head clamp bolts.
Coulter Down-Pressure Chart
Spring Length Coulter Force
10 1/4 in. 300 lb.
10 in. 400 lb.
9 3/4 in. 525 lb.
10300
Figure 23
Coulter adjustment
NOTE: There may be as much as a 1/8-inch gap
between the clamp plates even when the
coulter is mounted securely.