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Sowing Speed
Typical travel speeds when sowing range from 6-12 km/hr in
good conditions. In stoney and uneven ground conditions a
lower speed is recommended to minimise rapid part
deterioration. Sowing too fast can result in:
1 Poor contour following and uneven sowing depth.
2 Impact damage to:
a Ground engaging components.
b Bearings, housings & axles.
c Fasteners & structural components.
3 More extreme conditions will result in greater vibration
and uneven seed flow at low seeding rates.
Sowing Depth Control
The sowing depth is dependent on:
1 The wheel height in relation to the chassis.
2 Dragbar spring pre-compression.
3 Tyre pressure.
4 Ground condition i.e. hard, soft, how even.
The wheel height in relation to the chassis is controlled using
the wheel retraction stop. To adjust the wheel height;
a Lift the drill using the three point linkage sufficiently to
unload weight on the wheel.
b Loosen the M12 nyloc nuts on the clamp plate
assembly (1).
c Remove the R clip and pin (2).
d Adjust the wheel retraction stop (3).
e Refit the pin, R clip and retighten the nyloc nuts.
Refer Fig 1.
A more consistant sowing depth is acheived with minimal
dragbar deflection. With harder ground conditions more spring
pre-compression may be required. Adjust the M10 plain nuts
(1) as desired. Refer Fig 2. Note, less spring pre-compression
will allow the disc to ride over rigid obstacles, eg stones.
In bumpy or undulating ground conditions the drive wheel will
drop away from the wheel retraction stop to maintain seeder
drive.
Avoid sowing through dips with a rigid top link. Excessive
loads will be transferred through the linkage stays to the wheel
which may cause componentry damage. If possible use a
floating top link. When sowing over ridges the drive wheel may
loose contact with the ground temporary.
Disc penetration ability will improve as discs sharpen with
initial use.
Fig 1
Fig 2
2
1
3
1
Pt. No. 67372
Issue 0806