Great Plains CALIBRATION CRANK Assembly Instructions - Manual (Page 2)

152-302M 10/4/2005
Great Plains Mfg., Inc.
Calibration Crank Kit 2
Assemble Calibration Crank and
Coupler
Refer to Figure 2
1. Place black vinyl hand grip over calibration
crank handle.
2. Secure calibration crank to storage stob with
retaining pin.
3. Remove washer and roll pin from jackshaft.
Attach coupler to jackshaft and secure with
roll pin. Discard washer.
NOTE: Coupler should remain on jackshaft. Do
not remove coupler even after calibration.
Calibrate
Refer to Figure 3
1. Attach calibration crank to 706/1006NT
gauge wheel jackshaft. Disengage lockout on
the drive wheel. NOTE: If unit has native
grass an extra calibration coupler is needed
on the right hand gauge wheel. This can be
ordered thru your Great Plains Dealer.
2. Rotate calibration crank to see that feed cups
and drive are working properly and are free
from foreign matter.
3. To adjust seeding rate, decide which drive
type (gearbox) setting you need from the
seeding charts. Set the gear box. Rotate cali-
bration crank a few turns to confirm gearbox
has been engaged.
4. Record weight of an empty container large
enough to hold seed metered for one acre.
5. Turn calibration crank several times to fill seed
cups with seed. Turn crank until seed falls to
the ground from each cup.
6. Rotate gauge wheel jackshaft using calibra-
tion crank about 595 rotations for the 706 and
411 rotations for the 1006. This is equal to
one acre.
7. Check that the three seed cups have plenty of
seed coming into them.
8. Weigh metered seed. Subtract intial weight of
container. Divide by three. Multiply by the
number of openers on your drill to determine
total pounds seeded per acre. If this figure is
different than desired, set your seed rate ad-
justment handle accordingly.
NOTE: You may want to repeat the calibration pro-
cedure if your results vary greatly from the seed
rate chart.
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Figure 3
Calibrate with Calibration Crank
Figure 2
Calibration Crank Assembly
Equations for calibrating seed rate:
measured seed - empty container
3 (number of seed cups measured)
= pounds per seed cup
pounds per seed cup x number of openers = pounds per acre
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