Great Plains CTA4000 Operator Manual - Manual (Page 22)

20
Section 3 Adjustments
CTA4000 Air Drill Implement 160-269M 2/1/06
Great Plains Mfg., Inc.
To set down pressure:
1. Lower openers to ground. Lock hydraulic lever in
place.
2. Turn knob on pressure-control valve. While watching
pressure gauge, turn knob until gauge shows desired
pressure. Turn clockwise to increase pressure. Turn
counterclockwise to decrease pressure.
3. Once pressure is set, lock knob with lock disk.
NOTE: To account for additional compaction from drill and
tractor tires, you can set pressure on center section slight-
ly higher than wings.
Weights
!
WARNING!
Crushing hazard. Weights that are not properly secured or po-
sitioned could fall off the implement during folding, field oper-
ation or transport and cause severe injury or death to
bystanders. Adding weight to the wings could cause a wing to
drop suddenly during folding and severely injure or kill by-
standers. Do not add more than four weights (two pairs) to the
implement. Use only Great Plains weights, part number 163-
233A, as additional weight on the implement. Do not add
weights to the wing sections.
In some field conditions, your drill may need additional
weight for sufficient opener penetration. Additional
weights are available from your Great Plains dealer. Up to
four 700-pound weights can be evenly distributed over the
center section of implement. Refer to the weight chart to
see results of adding weights.
Spring Down Pressure
For planting in tire tracks, you can increase spring pressure
on individual openers. To increase spring pressure, tighten
flange nut at lower end of opener spring. See Figure 3-2.
Each 1/4-inch adjustment adds about 13 pounds of force at
opener disk. Do not tighten nut more than one inch. After
adjusting, lock flange nut in place with jam nut.
Figure 3-2
Individual Opener Pressure Adjustment
Opener Depth
Press Wheel Adjustment
Set opener seeding depth by adjusting press-wheel
height. To adjust, first raise openers slightly, then lift and
slide T handles on top of openers as shown in Figure 3-3.
Adjust all press wheels to the same height.
•
For more shallow seeding, slide T handles toward
implement.
•
For deeper seeding, slide T handles away from im-
plement.
6-Inch Rows 7.5-Inch Rows 10-Inch Rows
Empty Drill 13,673 lbs 12,660 lbs 11,648 lbs
Per Row, No
Weights 171 lbs 195 lbs 233 lbs
Per Row,
Four Weights 206 lbs 237 lbs 289 lbs
IMPORTANT: You must lock hydraulic lever forward to
provide constant hydraulic flow to openers. Refer to
Opener Operation, Operating Instructions, page 15.
17158
Figure 3-3
Press Wheel Adjustment
15659