17
Pt. No. 67439
Issue 1120
‘Enviro DD35’ Calibration
Seed Calibration
The calibration test should be done to confirm the settings of
the required seed rate and is done with the drill stationary and
level with the fan off.
The metering units must be set prior to filling with seed.
Seed Calibration Procedures
1 Ensure that the metering unit is free from debris. Close
the trap-door.
2 Fill the appropriate bin. A minimum depth of 300mm is
required for calibration with normal seeds.
3 Release the elbows from under the metering housings
by unscrewing the wing nut and swinging the keeper out
of the way. Move the elbow to one side.
4 Unhook the calibration tray from the rear of the machine,
locate it on the guides and slide the tray under the bin
outlets.
5 The bins are calibrated one-at-a-time; on the drive
pedestal (outboard) end, remove the lynch pin and
disconnect the unused driveshaft. Attach the end to the
dummy shaft provided on the pedestal.
6 Place the crank handle over the hexagonal drive dog
turn anti-clockwise until the seed flows consistently..To
ensure complete filling of the seed unit continue turning
the crank until an even flow of seed is coming out of the
seeder units, then empty into the seedbox. The drill is
now ready for calibration.
8 Turn the crank handle anti-clockwise 27 turns - this
represents 1/40th Hectare
Note The Calibration is usually done for 1/40th Hectare.
For very small seed rates or when using inaccurate
scales (i.e. unable to measure to the nearest gram) the
calculation based on 1/10th hectare should be used. In
this case the turn the crank handle 108 turns.
Scales must be accurate to 2 grams as any error will
be multiplied by either 10 or 40 giving inaccurate
calibration results.
For
1
/
40
Hectare (250m
2
) Calibration
Seed Rate = Actual Seed Collected (kg) x 40
For
1
/
10
Hectare (1000m
2
) Calibration
Seed Rate = Actual Seed Collected (kg) x 10
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