Great Plains V-300F Operator Manual - Manual (Page 84)

80 V300 & V300F Great Plains Manufacturing, Inc.
148-057M-A 11/15/2007
Refer to Figure 87 - The diverter shaft for the main seed box is
just forward of the calibration tray.
8.
Remove the calibration crank from its storage loca-
tion on the ground drive.
9. Position the square socket of the handle end of
the crank over the calibration shaft index collar for
the main seed box. Push in and rotate the shaft
clockwise to set the diverter gates to send seed to
the calibration tray.
10. If the drill is a model V300F, use the crank on the fer-
tilizer diverter shaft to close the gates, so that no fer-
tilizer is mixed with the seed sample. See page 87.
11. Raise the drill openers and install lift locks.
Refer to Figure 88
12. Position the hex socket end of the calibration crank
on the ground drive contact wheel shaft, and rotate
the shaft counter-clockwise 3 turns. This is to ensure
that the meters are full of seed and metering at the
current rate.
13. Remove the calibration tray. Empty it into the main
seed box, and re-insert it (open side up).
14. Rotate crank counter-clockwise. Stop after the first
two turns and check that seed is flowing from all
meters. Slowly remove the tray and check for compa-
rable seed piles.
Continue rotating, at an rpm that simulates the
expected planting speed (see table on page 74).
Stop periodically. Check that the tray is not over-full.
Stop when the count (from step 1) is reached.
15. Carefully remove the calibration tray. Empty it into
the calibration bag. Weigh the bag.
Note: If the scale was “zeroed” for the bag weight at step
3, the scale reading is the seed weight only.
16. Calculate the rate for a full hectare or acre. In the
chart, note the setting reported for that rate, and the
difference between that setting and the setting used.
17. Adjust the meter scale setting by the difference.
- If the sample size was high, adjust down.
+ if the sample size was low, adjust up.
18. If the change was significant, retest at new setting.
19. Empty the bag into the seed box.
20. Re-insert the tray facing down (to prevent collection
of debris), and swing latch down to secure it.
21. Using the crank handle, push in and turn the meter
diverter shaft counter-clockwise, back to normal
operating position.
Figure 87
Main Box Diverter Shaft
23268
3
4
3
4
Figure 88
Calibration Crank Installed
22613
Example:
Sample weight: 13.5 kg
Full hectare rate: 10 x 13.5 = 135 kg
Chart setting for 135 kg: approximately 71
A difference from 65 of: 6
Sample weight was high.
Subtract 6 from previous setting (65-6 = 59).
Retest at a scale setting of 59.