Great Plains ADC2220 Operator Manual - Manual (Page 75)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 71
2012-10-17 Table of Contents Index 167-073M
10. Turn the calibration crank clockwise for the number
of turns to simulate one acre (or hectare).
Note: It is important to turn the calibration crank at a
moderate speed. (About 1 revolution every
2 seconds is the proper speed to simulate
5 to 6 mph (8 to 9.6 km/h) planting speed.)
See chart at right for the correct number of turns for
your implement.
Note: A longer calibration is always more accurate,
especially for low rates and small seeds.
11. Wipe all the material off the flanges around the
meter doors and capture that material in the
calibration container.
12. Accurately weigh the container plus material.
Subtract the empty container weight to determine
the application rate.
13. If the calibrated rate matches the target rate, or is
closer to the target weight than the adjacent chart
rates, skip to step 18. Otherwise…
14. Subtract the calibrated rate per acre (or hectare)
from the target rate to determine a correction
difference.
15. Add the rate difference to the original chart rate to
determine a new chart rate.
16. Refer to the seed rate chart for Seed Rate drive
setting values for the new chart rate.
17. Run the calibration again, starting at step 9, using
the new drive settings.
18. With the present meter satisfactorily calibrated,
re-engage the clutch that was disengaged at step 4.
19. Repeat the calibration procedure for the other
hopper, starting at step 1.
20. Remove and store the calibration crank.
Drill Model
Calibration Crank Revs for…
1 Acre 1 Hectare
ADI334 66
3 ⁄
4
164.9
ADI345 66
3 ⁄
4
164.9
CTA4000 66
3 ⁄
4
164.9
CTA4000HD 66
3 ⁄
4
164.9
NTA3010 83
1 ⁄
4
205.7
NTA3510 66
3 ⁄
4
164.9
Example results:
54.4 pounds GrossWeight
54.4 - 2.86 is:
51.6 pounds SampleWeight
SampleWeight GrossWeight ContainerWeight – =
Example:
60 lbs/ac target rate
60 - 51.6 is:
8.4 lbs/ac Rate Difference
The calibration run metered 8.4 pounds too little.
You must increase the drive settings to compensate.
RateDifference T etR
arg
ate CalibratedRate – =
Example:
57.2 lbs/ac previous chart rate
57.2 + 8.4 is:
65.6 lbs/ac New Chart Rate
NewChartRate PreviousChartRate RateDifference + =
Example: for
65.6 lbs/ac New Chart Rate
the closest chart rate is:
65.2 lbs/ac
which corresponds to initial drive settings of:
20T DRIVING Quick-Change Sprocket
30T DRIVEN Quick-Change Sprocket
54T DRIVING Meter Box Gear
17T DRIVEN Meter Box Gear
E2 Shifter Levers