Great Plains YP1625 Operator Manual - Manual (Page 35)

7/12/2005 401-182M
33 Adjustments
Unit Mounted Coulters
Adjust the coulter to run even with or 1/4” shallow-
er than the row-unit disks. In heavy residue or
hard soils, the coulters may need to run deeper.
Refer to Figure 23
1. To adjust the coulter vertically, loosen the 3/4"
jam nut (1) and the 3/4" x 3" long hex bolt (2).
2. By turning the cam hex (3), rotate the cam
casting to set the desired height.
3. Tighten the bolt and jam nut. Refer to “Torque
Value Charts,” on page 97.
25 Series Row Units
IMPORTANT: Do not back up with row-units in
the ground. To do so will cause severe dam-
age and row-unit plugging.
Row-Unit Down Pressure
Refer to Figure 24
Row-unit springs provide the down pressure nec-
essary for row-unit disks to open a seed trench.
The springs allow the row-units to float down into
depressions and up over obstructions. Springs
also provide down force on coulters when using
optional row mounted coulters.
You can adjust down pressure individually for
each row-unit. This is useful for penetrating hard
soil and planting in tire tracks. For best results al-
ways adjust tractor tires so they are not ahead of
30” rows.
Use only enough down pressure to cut the seed
trench and maintain proper soil-firming over seed.
Excessive row-unit down force will lead to prema-
ture wear on row-unit components. Excessive
down force will also cause uneven seed depth.
Refer to Figure 25
To adjust down pressure, use a 1 1/8” open end
wrench. Position wrench on the nut and pull down.
Move the adjustment cam to the new setting.
Figure 24
25 Series Row-Unit Springs
Row-unit spring
21947
Figure 23
Coulter adjustment
15053
Figure 25
Press Wheel Adjustment
21948