Great Plains 2SF30 Operator Manual - Manual (Page 49)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 45
2014-01-09 Table of Contents Index 155-015M-A
Fertilizer Meter Rate
Application rates will vary with fertilizer type, density and
particle size. Relative humidity and field conditions can
also affect application rates. The chart on the page 46 is
based on material with a density of 65 pounds per cubic
foot (1.04 kg/L) and average particle size. Initially set the
rate according to the charts, then calibrate the drill to
your material as described below.
If your drill has two boxes, remember to repeat the
following steps for each drill box.
1. Raise the drill with the tractor hydraulics so the drive
wheels are off the ground. Rotate the drive wheels to
see that the metering system is working properly and
free from foreign material.
2. From the chart, find the setting number for your row
spacing and desired application rate. Rotate the gate
adjustment knob to the number obtained from the
chart.
3. Check that your gauge-wheel tires are the correct
size 9.5L x 15 inches and properly inflated. See “Tire
Inflation Chart” on page 68.
4. Record the weight of an empty container large
enough to hold the fertilizer metered for one acre.
5. Place several pounds of fertilizer over three fertilizer
feed cups on the outside end of the drill box. Pull the
fertilizer tubes off of these three openers.
6. Turn the gauge wheels a few turns to fill the feed
cups with material. Continue to turn until fertilizer
drops to the ground from all three tubes.
7. Place a container under the three tubes to gather
metered fertilizer.
8. Turn the gauge wheel until for one acre
(approximately 225 tire rotations on a 24-foot drill
and 182 rotations on a 30-foot drill). Check that the
three feed cups have plenty of fertilizer coming into
them.
9. Weigh the metered material. Subtract the initial
weight of the empty container. Divide by three.
Multiply by the number of openers on your drill to
determine total pounds-per-acre metered. If this
figure is different than desired, reset adjustment
knob accordingly.
Note: You may want to repeat the calibration procedure
if your results vary greatly from the chart.
10. When drilling, check the rate by noting acres drilled,
amount of fertilizer added to drill and level of material
in drill box. If you are applying more or less than
desired, adjust the metering rate slightly to
compensate for field conditions.
Seeding Drive Speeds
Refer to Figure 33
Note: When changing seeding drive speed for faster or
slower seeding, the fertilizer drive sprocket must
also be changed in order for the fertilizer rotor to
maintain consistent speed. The drawings below
illustrate the proper sprocket arrangement when
using both types of seeding drive speeds.
Figure 33
Sprocket Arrangements
11504