Gason 7312, Operator'S Manual

Page: 34 / 110

Operation
– VRT Drive
Page 30
07/18
Suggested Discharge Door Opening for Common Product on VRT Drive Spreader
Calculated for 730mm wide feed chain spreader’s at 20km/h
Product Rate (kg/ha) Width of spread (m) Suggested Door
Opening (mm)
Urea 40-100 24 40
Urea 40-100 36 50
Urea 100-200 36 75
Lime/Gypsum 500-1500 12 100
Lime/Gypsum 1500-3000 12 175
Manure Product dependent Product dependent 240 (fully open)
Table 51 Door Opening chart for
Hydraulic Drive VRT spreader models
Making
adjustment to the ‘Flow Factor’
The ‘Flow Factor’ will default to 100%
unless previously altered. It is adjusted if the
product is going out too light or too heavy.
Increase the % to increase the product output .
Decrease the % to reduce the flow of product.
Adjustment of the flow factor will not
adjust the onscreen recorded rate of product
used.
Example of when to change the ‘Flow Factor’ %
setting:-
Having placed a known weight of product
in the bin and spread it over a known area,
calculate the actual flow rate by dividing the
weight that has been spread by the number of
hectares covered. In this example we will say that
a 1000kg pre-weighed bulker bag of urea has
been loaded into the spreader. The set
application rate is 80kg/ha with a spread width of
36m. After covering 10.4ha, the product runs out.
Divide the product weight dispensed by the
hectares covered:
To adjust the Flow Factor % to achieve the
desired 80kg/ha without upsetting the history of
the amount applied, use the following equation.
Once the adjustment to the flow factor has
been determined you will need to enter the ‘Flow
Factor’ setting screen via the ‘Calibrate’ tab.
Reasons why the Flow Factor alters from 100%.
With some free flowing products, the
speed at which the material meters out the back
door can be quicker than for dense and stickier
products. For this reason it may be necessary to
alter the default 100% either up or down slightly
too fine tune the application rate to the product
being spread.
Spreaders fitted with the Load Cell option
will have an advantage in that checking the actual
amount being spread over a known area is
extremely simple. By just recording the original
weight vs the weight still in the bin after several
hectares, the operator can subtract one from the
other to determine the amount of material used.
Product Used (kg)
Area covered (ha)
= Applied Kg/ha
1000kg
10.4ha
Set Applic. Rate (kg/ha) x Current Flow factor (%)
Calculated Rate of application (kg/ha)
80 kg/ha x 100%
96 kg/ha
= 83.3%
Fig.52 Flow Factor screens.
= 96kg/ha (calculated rate used)