Great Plains 3S-3000F Operator Manual v2 - Manual (Page 44)

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Section 3 Adjustments
3S-3000 Three-Section Folding Drill 195-110M-A 11/9/07
Great Plains Mfg., Inc.
IMPORTANT: Open-center tractors and tractors with
fixed-displacement pumps are not designed to provide a
continuous supply of pressurized oil to remote valves.
Locking hydraulic lever forward on these tractors can
cause overheating of hydraulic oil and tractor damage. Af-
ter setting opener down pressure, always return hydraulic
lever to neutral.
00 Series Opener Adjustments
Depth Controlling Press Wheel Adjustment
Attached to the rear of each opener is one of several op-
tional press wheels. The press wheels close the furrow
and gently press soil over the seed while also providing
depth control for the opener. To adjust the position of the
press wheel, which automatically changes the seeding
depth of the opener, lift the "T" handle located on top of the
opener and slide it forward or rearward until the seeding
depth is correct as shown in Figure 3-8. Moving the handle
forward plants shallower while moving the handle rear-
ward plants deeper. A spring loaded pin holds the "T" han-
dle at the setting to maintain the proper depth. Lift the
opener frames slightly to take the pressure off the "T" han-
dles when adjusting the press wheel depth.
The opener pressure setting as described in Opener Pres-
sure Adjustments, this section on page 40, controls the
soil firming pressure on the press wheel as well as the disk
penetrating force. DO NOT use more opener down pres-
sure than necessary to obtain the desired opener penetra-
NOTE: On some tractors with very positive remote
hydraulic checks, a slight increase in the reading on
the pressure gauges may occur after the tractor re-
mote lever is returned to neutral. This is caused by
back pressure on the opener cylinders and should be
ignored. The NET OPERATING PRESSURE on the
opener cylinders is maintained at the pressure you
selected while the tractor remote lever was held for-
ward, not at the "apparently increased" pressure. Re-
activating the tractor lever forward will confirm this.
Press Wheel Adjustment
Figure 3-8
15659
tion and to maintain the proper firming action over the
seed. Set the planting depth with the depth controlling
press wheel and only use enough opener pressure to cut
the proper seed groove and maintain the desired soil firm-
ing action. Excessive opener force will lead to excessive
wear on the opener components.
Individual Opener Pressure Adjustment
The spring pressure on each individual opener can be in-
creased slightly for penetrating hard soil when planting in
tractor or drill tire tracks. The flange nut at the lower end of
the opener spring can be adjusted upward a maximum of
1". See Figure 3-9. Each 1/4" adjustment adds about 13
LBS. force at the opener disk. Lock the flange nut in place
with the jam nut after making a spring pressure adjustment.
Individual Opener Pressure Adjustment
Figure 3-9
15637
Individual Opener Height Adjustment
It is sometimes necessary to lower an opener which runs
in the depression left by a tire track. Each individual open-
er can be lowered 1" by moving the opener pivot bolt to the
lower hole in the opener mount. See Figure 3-10.
Individual Opener Height Adjustment
Figure 3-10
15671