Great Plains V-300F Operator Manual - Manual (Page 95)

Great Plains Manufacturing, Inc. Adjustments 91
11/15/2007 148-057M-A
Opener Height
The depth to which the opener disk blades penetrate
the soil is controlled in front by the tool bar and pivot
(opener height), and in the back by the press wheel
height.
If the actual ground level is lower for some rows, such
as those in tire tracks, you can lower that row unit by
lowering the pivot point.
Refer to Figure 99
1.
Raise the drill just enough to relieve tension in the
down-pressure spring.
2. Remove the bolt from the upper hole .
3. Re-position the arm at the lower hole , and
secure with bolt.
Note: No spring tension or position adjustment is re-
quired. The pivot holes are designed for neutral
effect on spring tension. The bolt at the top end of
the spring uses a hole that depends on spring
length, and not opener height.
Row Unit Down Pressure (Spring)
For planting in tire tracks, and no-till conditions, you can
increase spring pressure on individual or on all openers.
Adjust the spring in conjunction with the sub-frame
down-force, and opener height, to keep the top of the row
unit parallel to the ground.
To set all rows to a higher force, see “Hydraulic Down
Pressure” on page 36.
Refer to Figure 100 and Figure 101
To increase spring pressure:
1. Loosen jam nut at lower end of opener spring.
2. Tighten flange against spring tension.
Note: Each cm adjustment adds about 9 kg of force at
opener disk (approximately 13 pounds per 1 ⁄
4
in).
Do not tighten nut more than 2.5 cm (one inch).
3. After adjusting, lock flange nut in place with jam
nut.
The length of the spring is factory-set to:
33.8cm (13 5 ⁄
16
in).
The reference points for this length are the
center of the upper/front clevis pin
and
the base of the lower/rear spring stop cup .
The factory preset length is recommended for conven-
tional till and min-till conditions. Shorten it for rows in
tire tracks or more difficult min-till conditions. The mini-
mum recommended length is:
31.3cm (12
5 ⁄
16
in).
Figure 99
Pivot Point Bolt Holes
26382
2
1
3
1
2
Figure 100
Row Unit Spring Tension
17158
1
1
Figure 101
00 Series Spring Length
26454
3
2 4
2
3
4