Operation 25
MAN0988 (11/5/2012)
5. Remove calibration tray (34 cu. in. capacity) from
storage location. Install tray in designated
collection slot and tighten against frame with two
plastic nuts (check that calibration tray does not
come into contact with ground roller).
6. Open seed cups to desired position (refer to chart
for estimate) and lock into place. (Primary and
Legume only)
7. Lower seeder to the ground and travel 100 feet.
8. Turn off engine and set parking brake.
9. Carefully remove calibration tray to retrieve
collected seed. Weigh seed and use formula to
determine seed rate.
10. If seed rate is not correct, adjust seed cup
openings and repeat steps 6 through 9.
11. Return calibration tray to storage position when
finished.
CALIBRATION FORMULA
Stationary Calibration Chart
No. of Turns to simulate traveling 100 feet with 2 seed meters
NOTICE: To calibrate the native seed box, leave the
chain drive connected between the primary seed cup
shaft and the native seed drive. Disconnect the ground
drive and legume seed box. Turn the primary seed cup
shaft per the chart above, to collect seed in the native
calibration slot.
Multiply calibration weight by 373.4
Example: .15 lbs collected with 15/30 tooth standard
sprocket and 11.1 turns of seed cup
.15 lbs x 373.4 = 56 lbs/acre
Metric Example: 68 grams collected with 15/30 tooth
standard sprocket and 11.1 turns of seed cup
68 grams x 373.4 = 25.4 kg/acre or 62.8 kg/hectare
NOTICE: Overlapping and rough terrain/fast travel
speeds will impact seed metering accuracy. The
amount determined at calibration will increase by 10 to
30% in actual seeding depending on these factors.
Conversion for Grams to Pounds:
453.6 grams / 1 pound OR
.0022 pounds / 1 gram
Conversion for Ounces to Pounds:
16 ounces / 1 pound OR
.0625 pounds / 1 ounce
1
st
Reduction
(Sprocket Teeth)
2
nd
Reduction
(Sprocket Teeth)
Primary
Seed Shaft Turns
Native
(Primary Shaft Turns)
Legume
Seed Shaft Turns
Standard
Seed Drive
15-30 15-30 11.1 11.1 11.1
Optional
Seed Drive
15-40 15-30 8.3 8.3 8.3
Slow
Seed Drive
15-50 15-30 6.6 6.6 4.5
Super Slow
Seed Drive
12-50 15-40 4 4 2.7
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