Great Plains 3N-3020P Operator Manual - Manual (Page 34)

3N-3010P and 3N-3020P
196-248M 4/23/2010
32
If more weight is required for coulters to penetrate
the soil, weight bracket kits are available from your
Great Plains dealer. Refer to “Weight Brackets,”
page 71 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.
Model 3N-3010P 7.5-In.
Rows
10-In.
Rows 15-In.
Rows
Pounds per coulter, no weights 427 531 741
Pounds per coulter, brackets
and 1000 lbs. added
448 559 783
Pounds per coulter, brackets
and 2000 lbs. added
469 588 825
Model 3N-3020P 7.5-In.
Rows
10-In.
Rows 15-In.
Rows
Pounds per coulter, no weights 467 571 781
Pounds per coulter, brackets
and 1000 lbs. added
488 600 823
Pounds per coulter, brackets
and 2000 lbs. added
509 628 865
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.
Coulter Down-Pressure Chart
Spring Length Coulter Force
10 1/4 in. 300 lb.
10 in. 400 lb.
9 3/4 in. 525 lb.
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 13
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.
NOTE: There may be as much as a 1/8-inch
gap between the clamp plates even when the
coulter is mounted securely.
10300
Figure 13
Coulter adjustment