Great Plains NTA1300 Operator Manual - Manual (Page 24)

22 NTA 1000 and NTA 1300 148-528M 5/26/2006
Great Plains Mfg., Inc. Adjustments
Figure 24
Individual Coulter Mounting
Figure 25
Weights & Weight Brackets
Figure 26
Coulter Spring
Coulter Mounting Height
You can change the depth of individual coulters by adjust-
ing coulter-mounting height. If you adjust coulter height,
be sure to rebolt coulters vertically straight and correctly
spaced. To raise or lower individual coulters:
1. Loosen mounting clamps and adjust coulter to desired
height. Do not lower coulter spring bar below top u-
bolts on coulter clamp.
Refer to Figure 24
2. To re-tighten clamps. Snug hex-head clamp bolts (1)
just until u-bolts are tight on each side of spring bar.
3. Tighten nuts (2) on u-bolts.
4. Finish tightening hex-head clamp bolts (1).
NOTE: Even when coulter is held securely, there may be a
gap between clamp halves.
Coulter Down Pressure
Added Weight
Refer to Figure 25
In hard soil conditions where coulter penetration is limited,
you can add suitcase weights to brackets on the hitch
frame. Adding weight on the hitch frame provides the best
weight distribution for no-till drilling.You can add up to
450kg (1000 lbs, on a 3 meter drill) or 590kg (1300lbs, on
a 4 meter drill) of additional weight. Place an equal amount
of weight on each weight bracket.
Coulter Springs
Refer to Figure 26
Coulter-spring length is preset at the factory to 254 mm
(10 inches), giving coulters an initial operating force of 181
kg (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 reduce coul-
ter down pressure to give coulters better impact
protection. Refer to the following chart for adjusting coulter
down pressure.
NOTE: Do not reset coulter-spring length shorter than
248 mm (9 3/4 inches). Shortening springs more than 248
mm (9 3/4 inches) may contribute to premature failure of
parts and warranty will be voided.
10300
Spring Length Coulter Down Pressure
267 mm (10 1/2 in) 79 kg (175 lbs)
260 mm (10 1/4 in) 136 kg (300 lbs)
254 mm (10 in) 181 kg (400 lbs)
248 mm (9 3/4 in) 238 kg (525 lbs)
19406
13990