Great Plains 3N-3020 Operator Manual - Manual (Page 35)

3/29/2012 196-366M
33 Adjustments
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 62 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-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 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 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 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