Great Plains 3000 Operator Manual - Manual (Page 14)

12
Section 3 Adjustments
2700 and 3000 Three-Point Drill 118-365M-A 9/9/10
Great Plains Mfg., Inc.
Adjusting Seeding Depth
Your drill is designed to run level to the ground when low-
ered into seeding position. You may need to make minor
adjustments to achieve desired seeding depth.
Press Wheels
Opener depth is controlled by the height of its press wheel.
Changing the height of the press wheel automatically
changes the seeding depth of the opener.
To adjust press-wheel height, lift up on the T-handle and
slide it forward or back. Refer to Figure 3-4.
Figure 3-4
Press Wheel Adjustment
Down-Pressure Springs
Each opener can be adjusted individually for increased or
decreased down pressure. Increased down pressure aids
opener penetration in hard soils and tire tracks. De-
creased down pressure may prevent openers from plug-
ging in wet soil.
To adjust opener down pressure, remove the W clip at the
bottom of the spring shown in Figure 3-5. Place the clip in
a higher spring-rod hole for increased pressure. Place the
clip in a lower hole for decreased pressure. If an opener is
running too deep at the lowest pressure setting, the W clip
can be removed completely.
Figure 3-5
Individual Opener Spring Adjustment
Bedded Irrigation
If your drill is outfitted with the bedded irrigation option,
you can adjust the height of openers that run in irrigation
furrows.
When running the drill in a level field, mount the openers in
the top hole (1).
To lower the openers for irrigation furrows, move the open-
er pivot bolt (2) to a lower hole in the opener mount. Low-
ering the pivot bolt one hole lowers the opener body 2 1/2
inches.
Figure 3-6
Bedded Irrigation
Seeding Rate
Calibrating the seeding rate requires four steps: arranging
the drive sprockets, setting the seed-rate adjustment han-
dle, positioning the seed-cup door, and checking the seed-
ing rate.
Refer to the seed-rate charts starting on page 15. These
charts list the proper sprocket sizes and seed-rate-handle
settings for various seeds and seeding rates.
The seed-rate charts are based on cleaned, untreated
seed of average size and test weight. The rates are based
on 9.5L x 15 rib implement tires. Many factors will affect
seeding rates including foreign material, seed treatment,
seed size, field conditions, tire pressure and test weight.
Minor adjustments likely will be needed. Set and check the
seeding rate using the procedures below, then re-adjust
the rate as necessary.
Before setting the seeding rate, rotate the drive gauge
wheel to see that seed cups and drive are working proper-
ly and free from foreign material.
12100
Maximum Pressure
12103 12102
Minimum Pressure
1
2
16766