Great Plains 3P300 Operator Manual - Manual (Page 25)

Great Plains Manufacturing, Inc. Preparation and Setup 21
09/14/2009 500-103M-A
Sprayer Calibration
Sprayer calibration prepares your sprayer for operation
and diagnoses nozzle wear. This gives you optimum per-
formance from your nozzles and ensures accurate appli-
cation.
Equipment that may be needed:
• 817-199C Calibration Container
• Great Plains Nozzle Tip Calculator:
832-038C - U.S. customary units (English), or
832-058C - Metric (English/Russian legends)
• General calculator
• Stopwatch or wristwatch with second hand.
Manual Pressure Valve
Refer to Figure 10
When the manual pressure valve
is full open, the
pressure adjustment can be very sensitive.
• If sprayer is equipped with an automatic controller, the
butterfly valve will have to move more often causing
additional wear.
• If your 2007- sprayer is equipped with manual controls
plumbing, the pressure adjustment switch on the con-
trol box will be more sensitive and it will be hard to set
the pressure.
To decrease the sensitivity, set the manual pressure
adjustment valve as follows:
1. Open the control valve so that it is wide open and
there is full flow to the sprayer booms. On a sprayer
with manual controls, adjust the pressure switch. On
an automatic controller, open the butterfly valve until
it is full open.
2. Shut the manual pressure adjustment valve down so
the pressure is about 20 PSI greater than the pres-
sure you will spray at. The pressure the spray will be
applied at is determined when calibrating sprayer.
Refer to the Application Guide.
With this valve set, it will decrease the flow through the
electric ball valve and reduce the sensitivity of the pres-
sure adjustment switch.
27165
Figure 10
Agitation/Manual Pres. Valves
15783
1
2
2