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21
Pt. No. 67303
Issue 0806
Sowing Small Seed
Calibration with Disconnected Agitator Shaft
The fine seed metering wheel used in Duncan Drills is
especially well suited for sowing small seeds such as rape.
Due to the intensive action caused by the agitator the seeds
can adhere to each other, or be damaged, causing irregular
sowing/germination.
Therefore it is recommended that
when sowing small seeds, especially oil seeds and thin
shelled seeds, the drive to the agitator is disconnected.
To do this remove the lynch pin as shown in Fig 14/1.
Deviations between the calibrated and actual seed rate can
occur when residual dressing agent sticks to the bottom flaps
and thus slows the flow of seed. Before beginning the actual
calibration test fill the calibration trays. This will cause an
immediate buildup of the dresssing agent on the flaps. Return
the contents of the calibration trays to the seed box and
proceed with the actual calibration. Due to the residue
buildup on the flaps your calibration will now reflect accurately
the required seed rate.
Note - Remember to reconnect the agitator shaft as required
for other seeds otherwise the consistency of seed rate will be
affected.
Sowing Peas
Peas having the size and shape as illustrated in Fig 15 (e.g.
White Field Peas), can be sown without problems with all
Duncan Drills with this type of metering wheel.
The flap should be set to a gap of at least “3” on the flap
setting lever. Refer Page 17, Fig 9.
With these peas it should not be necessary to run the agitator
shaft.
Peas having the size and shape as illustrated in Fig 16 (e.g.
Green or Garden Peas), tend to bridge inside the seedbox
and do not flow freely.
This multi-faceted pea requires agitation for sowing.
Fig 15
Fig 16
Fig 14
1
Caution - When resetting the metering wheels
on the seeder shaft
Care should be taken when tightening the grub screws
(Fig 12/3) on the fine seed wheel. Adjust the grubscrew until
the movement of the metering wheel just stops, then tighten
no more than 1/8 of a turn.
Do not overtighten as this can result in breakages while
operating and may render the warranty on these units void.