Great Plains 1205NT Operator Manual - Manual (Page 28)

1205NT
150-131M 3/28/12
26
Coulter Down Pressure
Weights. If more weight is required for your soil
conditions, add weights to weight brackets locat-
ed on box frame. No more than 1200 pounds (600
pounds per side) should ever be added. Add an
equal amount of weight to each end of drill. See
Table 1.
Spring Length. Coulter springs are preset at 10
inches, giving coulters an initial operating force of
400 pounds. This setting is adequate for many dif-
ficult no-till conditions.
Equipment Damage Risk:
Resetting coulter-spring length shorter than 9 3/4 inch-
es may contribute to premature failure of parts and war-
ranty will be voided. If additional force is needed, add
weights to drill.
For lighter no-till conditions where rocks or other
obstructions are a problem, you can lengthen
coulter springs to protect coulters from impact.
Refer to Table 2.
Individual Coulter Adjustment
Individual coulters can be lowered if coulters fol-
low in tractor tire tracks and do not give
satisfactory depth. To do so:
1. Loosen 5/8 inch jam nuts on 5/8 inch square
head set screws. Then loosen set screws.
2. Lower coulter to desired depth.
3. Tighten set screw on side of coulter clamp
first. This squares coulter bar in clamp.
4. Tighten set screw on front of coulter clamp.
Then tighten both 5/8 inch jam nuts on each
set screw.
NOTE: Torque 5/8 inch set screws 85-100 ft-lbs to
obtain adequate holding force.
Pounds Per Coulter
7 inch 7.5 inch 8 inch 10 inch
Empty Drill 274 282 290 363
Drill with 300
pounds added
304 314 323 406
Drill with 600
pounds added
334 345 356 449
Table 1
Weight Chart
Figure 15
Coulter Spring Length
13990
Table 2
Spring Length Chart
Spring
Length
Initial Vertical Coulter Force
10 1/2 inches 175 pounds
10 1/4 inches 300 pounds
10 inches 400 pounds
9 3/4 inches 525 pounds