17
Speed Setting
Gearbox Clutch
Sprocket Sprocket
High Speed
15 Tooth 19 Tooth
(Standard)
Low Speed 19 Tooth 15 Tooth
Hand Crank Turns for Seed Rate Calibration
The tables represented below are for arable conditions (worked ground)
and are calculated to indicate an average situation. If there is any doubt
as to the accuracy of these figures for the conditions, it is advisable to
run at least 1 of the 2 checks on the calibration figures listed.
Refer Page 18, Recalculating the Constant, and/or Groundwheel
Rotation Deviations below.
9 Weigh the seed collected during the test in kilograms.
10 Calculate the seed rate by multiplying the kgs previously collected x
40 (1/40th ha method) or x 10 (1/10th ha method) depending on
requirement. If the resultant calculation does not
produce the desired seed rate use the enclosed seed
rate calculator disc to determine the correct gearbox
setting.
Refer Use of Seed Rate Calculator, Page 20.
Suggestion To be on the safe side and until confidence
has been gained with the method of calibration it is
advisable to conduct a second test at the newly
determined gearbox setting.
11 Where a coated seed is used it is advisable to check the calibration
after 1 hectare as dressings can tend to create a coating on the seed
metering wheels thus changing the the flowing properties of the seed
which in turn alters the seed rate.
Groundwheel Rotation Deviations
It is always possible with different host machines and different ground
conditions that the calculated rolling circumference of the groundwheel will
not match actual operating conditions. This could cause large differences
between the calibration test and the actual sowing rate. If this occurs use the
following procedures.
Effective rolling circumference used in standard calculations = 2.2m
For
1
/
40
Hectare (250 m
2
) Calibration
Seed Rate = Actual Seed Collected (kg) x 40
For
1
/
10
Hectare (1000 m
2
) Calibration
Seed Rate = Actual Seed Collected (kg) x 10
Machine No of Sowing
Size Seeders Width (m)
2.5m 19 Run 2.35 44 175 High
2.35 27 109 Low
3.0m 21 Run 2.78 37 148 High
2.78 23 92 Low
3.5m 25 Run 3.39 30.5 121.5 High
3.39 19 75.5 Low
Turns for
1
/
40
Hectare
Turns for
1
/
10
Hectare
Speed Setting
Table 2
Pt. No. 67355
Issue 0906
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