John Shearer Pasture Renovation Drill Operator's Manual page 24

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The calibration is necessary since not all seeds are the same (for example,
wheat from one bag may not be the same as another, due to the size of
the grains, moisture content and other factors). The machine remains
stationary through this process. The ratio of the drive sprockets is
important as it will affect the output. These ratios can be changed to allow
for particularly low or high rates to be achieved (see table below).
Performing this calibration regularly will help maintain an accurate rate.
Seed type
Sprocket
Ratio
Seed Rate
Fertilizer
On this page select the type of seed or fertilizer to calibrate, the seeding
type
rate and the sprocket ratio (note: the image helps to identify which way
the sprockets are positioned).
Step 2) Prepare to collect the seed.
If restrictors need to be added or removed do this now before you fill the
box.
Fill the box with the seed you want to calibrate. Make sure there is enough
seed to at least complete the calibration. If you are ready to start seeding
you may want to fill the bin all the way.
Place a container under the hoses you want to calibrate from (use at least
3 up to as many rows as the machine has – more will be more accurate).
Press to go straight
The container can be anything large enough to catch the calibrated amount
to "Start Seeder"
– i.e. a bag, bucket, etc. Make sure it is empty so you aren't calibrating
something else as well.
Step 3) Run the Calibration
When the information has been entered, the box is full and you are ready
to collect the product, press "Start".
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