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21.2 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. However, the line between
traditional ‘mini’ pellets and ‘full size’ is blurred – most are of similar size and some lower priced dry produced
pellets termed, as ‘minis’ are actually larger and heavier than more expensive wet produced pellets, and can
have a good spreading characteristics.
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. 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.
21.1 Spread bias adjustment
Ensure the correct Fan Jets are fitted in the correct position – the fixed deflectors fitted to the side of the Fan Jet
chassis should be facing inwards towards each other.
Ensure the disc rotation is correct, when viewed from behind the Left hand side Fan Jet disc should rotate in a
clockwise direction and the Right hand side Fan Jet disc should rotate in an anti-clockwise direction, for
clarification see Disc Rotation arrows on the decal.
The position of where the pellets flow onto the disc will affect where they come off the disc – this will affect the
overall spread width and pattern. Adjustment is provided by rotating
the bias dial * factory set at 65 degrees
The black plastic knob on the side of the chassis secures the bias
adjustment. Unscrew prior to adjustment and then retighten.
For maximum spread width, ensure disc speed is 100%. Bias
adjustment will alter spread width patter (most standard pellets
60—75 degree) Check overlap between wheels and extreme,
adjust accordingly.
Ensure the two spread patterns from the left hand and right hand
machine meet and overlap in the middle and the overall spread width
is correct.
Summary of Contents for Fan Jet Duo Plus VS-2 130
Page 23: ...23 22 Parts drawing...
Page 30: ...30 29 Notes page...
