Great Plains NTA3007HD Operator Manual - Manual (Page 90)

86 NTA907HD or NTA3007HD
166-207M 04/04/2011
Adjusting Hydraulic Down Pressure
Hydraulic down pressure controls drill-wide opener pene-
tration and press-wheel soil firming. Use only enough
down pressure to cut a furrow and maintain proper soil-
firming over seed. Excessive opener down force may
cause bulldozing of the openers in light soil conditions,
and leads to premature wear on opener components.
When higher wing down-pressures are required, an
increase in weight transfer is generally also required.
Increasing wing down-pressure with insufficient wing
weight results in outside rows running shallow. In
extreme cases of imbalance between down-pressure
and weight transfer, the wing gauge wheels could be
lifted off the ground.
Before adjusting down-pressure, observe the drill operat-
ing in your field conditions. Check the following table for
indications of adjustment needed.
Null4.aac:
Down-Pressure Adjustment Indications
Observation Probable Cause Adjustment
Press wheels leaving light or no tracks Insufficient down-force Increase down-pressure
a
a. When adjusting wing down-pressure, re-check performance in field, and re-adjust weight transfer as needed.
Press wheels compressing soil too deeply Excess down-force Decrease down-pressure
a
Openers not level Remove sub-frame shims (p 96)
Openers disks running too deep, despite
press wheel setting (“bulldozing”)
Excess down-force Decrease down-pressure
a
Opener sub-frames continuously moving up
and down
Insufficient down-force Increase down-pressure
a
Wing end tilted up Insufficient weight transfer Increase weight transfer
b
b. When adjusting weight transfer, re-check performance in field, and re-adjust down-pressure as needed
Incorrect gauge wheel tires
Wing ends tilted down Excess weight transfer Decrease weight transfer
b
Incorrect gauge wheel tires
Wing gauge wheels leaving light or no tracks Insufficient weight transfer Decrease weight transfer
b