GREAT PLAINS 3N-3010, Operator'S Manual, Page: 39 / 118

196-366m Table of Contents Index Adjustments
Great Plains | | 4/22/19 Table of Contents Index 35
Weights
Transport Hazard. Adding more than the recommend weight to
the drill frame could cause a tire to blow during 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 “Weight Bracket,” page lxv for part
numbers and ordering information.
Refer to the charts for the results of adding weights to
your drill. Always add an equal amount of weight to each
frame section.
 NOTE: Markers, harrow, and seed will add weight to
the drill.
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,
shortening 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 contribute 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 13
When coulters follow in tire tracks and do not give
satisfactory depth, individual coulters can be lowered 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.
 NOTE: There may be as much as a 1/8-inch gap
between the clamp plates even when the coulter is
mounted securely.
Weight Chart
Model 3N-3010
7.5-In.
Rows
10-In.
Rows
Pounds per coulter, no weights 427 531
Pounds per coulter, brackets and
1000 lbs. added
448 559
Pounds per coulter, brackets and
2000 lbs. added
469 588
Model 3N-3020
7.5-In.
Rows
10-In.
Rows
Pounds per coulter, no weights 467 571
Pounds per coulter, brackets and
1000 lbs. added
488 600
Pounds per coulter, brackets and
2000 lbs. added
509 628
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 13
Coulter Adjustment