Duncan DO 07185, Owner'S Manual

Page: 16 / 62

14
Basic Calibration Procedure
(Continued)
Seed Calibration
The calibration test should be done to confirm the required
seed rate and is done with the drill stationary and level.
Seed Calibration Procedures
1 Remove the calibration tray from the storage brackets
on the seedbox. Place the calibration tray (1) on the
support members below the seeders (Fig 5).
2 Position all the clear plastic seed diverters (2) to
redirect the seed into the calibration tray (Fig 5).
3 Make sure all the shutters are open and set to the
position indicated in the seed charts for the particular
seed (Table 3. Page 12).
4 Agitator Shaft - Check the Seed Chart “Hints” (Table 3)
whether to connect or disconnect the shaft by
removeing the lynch pins (1) during seeding (Fig 6).
5 For the test, half fill the box with seed. If this is not
possible make sure the seed is evenly distributed within
the box.
6 For setting method refer to Basic Calibration Procedures
(Page 13).
Note For seeds which are not covered in the Sowing Chart
(Page 12), use the figures for a seed of comparable size
and shape.
7 Place the crank handle over the hexagonal drive dog on
the transfer shaft and turn clockwise until the seed flows
consistently from the seeders (Fig 7). To ensure
complete filling of the seed unit continue turning the
crank until the calibration tray is approximately half full
then empty into the seedbox. The drill is now ready for
calibration.
8 Turn the crank handle clockwise the required number of
revolutions as detailed in Table 5.
Note The Calibration is usually done for 1/80th hectare.
For very small seed rates or when using inaccurate
scales (i.e. unable to measure to the nearest gram) the
calculation based on 1/20th hectare should be used.
Scales must be accurate to 2 grams as any error
will be multiplied by either 20 or 80 giving
inaccurate calibration results.
1
2
Fig 5
Fig 6
Fig 7
1