17
17-3 Spread width and pattern
BASIC RULE
. The spread width is dependent upon the density of the granule or seed, and the disc speed (plus
other factors).
Large, dense granules and seeds with a high disc speed give the maximum spread width – small, light granules
and seeds will not spread as far.
Other factors affect the spread width:
Type of slug pellet.
Typically, a large, dense hard pellet should spread further than a small, light, soft pellet,
because it is comparatively heavy and does not powder on the disc. Typically, a ‘wet’ produced pellet will be
hardest, a steam produced pellet mid range, and a dry produced pellet the softest.
Seed varieties and
dressings.
Different varieties and dressings will affect the density and the spread.
Wind Conditions.
Dead calm conditions are the optimum; any wind will affect the width pattern.
High forward speed.
The same as driving into a headwind of the same speed on a calm day, and this will peel
the edges of the spread pattern backwards and inwards.
Disc speed.
Altering the disc speed will affect the width and pattern. A higher disc speed will give a wider
spread width.
Disc vanes.
Ensure they are in good condition and not worn excessively. Replace if necessary.
Low disc height.
Will not allow the product to reach its maximum width before gravity takes over.
Low electrical power.
Will not allow the disc to reach full speed.
High application rates.
Loads the disc more than a lighter rate and can slow it down.
Incorrect disc angle.
It must be at least horizontal – not angled downwards.
It is the responsibility of the operator to ensure that no other persons enter the spreading zone
whilst the machine is in operation.
17-1 Setting the spread bias
(factory set at 90 degrees)
WARNING
Ensure the power supply has been disconnected before carrying
out work on the machine and the appropriate protective clothing worn
The complete feed
mechanism can be rotated
to bias the spreading arc to
the left or right, and even
out the spread pattern
equally from the centre-line
of the machine for in-field
work, and as a headland
control at field borders.
Adjustable deflectors that reduce the exit aperture
from the disc are incorporated into the Fan Jet to
physically limit the spread width for headland
control.
Undo the black plastic knob at the rear of the
chassis and slide each deflector around the disc as
far as required to prevent chemical granules from
entering a watercourse of grass margin.
Re-tighten the locking knob.
NOTE
Use the motor disc speed dial in conjunction
with the deflectors, and the bias adjustment.
17-2 Setting the headland deflectors
To adjust
1.
undo the black plastic locking knob on the side of the machine and using the stainless steel pointer to ro-
tate the complete circular mechanism as far as required, moving the indicator dimple in the direction in which
you want the arc to swing.
2.
Re-tighten the locking knob.
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