Great Plains 2S-2600F Operator Manual v2 - Manual (Page 31)

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Section 3 Adjustments
9/26/13 2S-2600 and 2S-2600F Two-Section Folding Drill 195-200M-A
Great Plains Mfg., Inc.
Fertilizer Rate Calibration
The 2S-2600F has chain drives powered off the gauge
wheels to meter fertilizer. Adjust application rate by chang-
ing drive sprockets.
Fertilizer application rates will vary with fertilizer type, den-
sity and particle size. Relative humidity and field condi-
tions can also affect application rates. The charts on page
30 are based on fertilizer with average particle size and a
density of 65 pounds per cubic foot. Initially set rate ac-
cording to charts, then calibrate drill to your material as
described on this page.
Fertilizer metering is controlled by separate sprocket sets
on each drill box. After setting and calibrating metering
rate for one drill box, install same sprockets on other drill
box.
1. Refer to fertilizer rate charts on page 30 to find correct
sprocket sizes for your drill and desired meter rate.
2. To switch between high and low range, loosen and
slide idler sprocket out of chain shown in Figure 3-5.
Remove lynch pin from end of shaft and install correct
sprocket.
•
For high range, install 16-tooth sprocket and short-
en chain by removing 16-pitch strand.
•
For low range, install 44-tooth sprocket and length-
en chain by reinstalling 16-pitch strand.
Move idler sprocket back into place so chain has 1/4-
inch slack.
Figure 3-5
Hi/Low Range Sprocket
3. To change driver/driven ratio, refer to Figure 3-6.
Loosen and slide idler sprockets out of chain. Remove
lynch pins from shafts. Place correct sprockets on
IMPORTANT: The rate charts are for granular fertilizer
with a density of 65 pounds per cubic foot. If you are
applying fertilizer with a different density, use density
conversion chart on page 30.
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16T/44T
shafts. Store sprockets not used on ends of shafts.
Reinstall chain and slide idlers back into place so
chain has 1/4-inch slack.
Figure 3-6
Driver/Driven Sprockets
4. Raise drill with tractor hydraulics so gauge wheels are
off ground. Rotate gauge wheels to see that metering
system is working properly and free from foreign ma-
terial.
5. Check that your gauge-wheel tires are 9.5L x 15 and
properly inflated. Refer to Tire Inflation Chart, “Ap-
pendix,” page 60.
6. Place several pounds of fertilizer over three fertilizer
feed cups on outside end of drill box. Pull fertilizer
tubes off of these three disk openers.
7. Weigh an empty container large enough to hold fertil-
izer applied to one acre.
8. Turn drive wheel until fertilizer starts to drop to ground.
9. Place container under the three tubes to gather me-
tered fertilizer.
10. Turn drive wheel 203 rotations until one acre has been
tallied on acremeter. Check that feed cups have plenty
of fertilizer coming into them.
11. Weigh metered material. Subtract weight of empty
container. Divide by three. Multiply by number of
openers on your drill to determine total pounds me-
tered per acre. If this figure is different than desired,
reset sprockets accordingly.
NOTE: You may want to repeat calibration procedure if
your results vary greatly from fertilizer rate chart.
12. When satisfied with metering rate, install same range,
driver and driven sprockets on other drill box.
13. When drilling, check metering 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
fertilizer than desired, adjust metering rate slightly to
compensate for field conditions.
Dr
iven
Dr
iver
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