ground logic Pathfinder - 6.3 Calibrating Spray Flow Rate

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6. CALIBRATION CONTINUED
6.2 CENTERING THE SPREAD PATTERN CONTINUED
• Add together all of the eleven numbers to nd the total material that was dispensed.
• Divide the amount caught in each pan by the total amount. This is the percentage that was caught in
each pan.
• The distribution should increase towards the center pan and decrease toward the outside pans. The
distribution should also be approximately the same on each side. If it appears that the left side is receiv-
ing more material, pull the spread control lever out slightly and repeat the process. If it appears that the
right side is receiving more material, push the spread control lever in slightly and repeat the process.
Only slight adjustments are needed to make spread pattern changes.
• Once the correct distribution is achieved, measure the distance from the console surface to the top of
the spread control lever. Record this measurement as the setting to be used for the particular fertilizer
being evaluated. Note that the spreader will have to be recalibrated for each different type of material
that is spread.
• When the calibration is complete, collect the fertilizer that has been dispensed for reuse. Never leave
the fertilizer on the pavement where it can wash away in runoff.
6.3 CALIBRATING THE SPRAY FLOW RATE
• The following instructions provide a method for adjusting the amount of ow being dispensed from the
spray nozzles.
• Fill the spray tank with water.
• Place a container in a position near the spray nozzles so that all of the spray being dispensed by the
nozzles can be captured in the container.
• Move the spray control knob to the desired spray width setting. The spray will ow through the broad-
cast tip (TF-VS5) on the wide spray setting. The spray will ow through the trim tip (TT11004VP) on the
narrow spray setting.
• Place the machine in neutral (N), squeeze the throttle lever to run the engine at full throttle, and adjust
the pressure relief valve so that the reading on the pressure gauge is 25 psi.
• Move the spray control lever to ON (horizontal position). Operate the spray system in the ON position
for exactly one minute.
• Measure the collected water. The amount collected for each tip should approximately be as follows:
• Broadcast tip (TF-VS5) = 100 ounces ± 10 ounces
• Trim tip (TT11004VP) = 40 ounces ± 4 ounces
• If the output from the nozzles is slightly different from the values listed above, adjust the pressure
relief valve slightly. Unscrewing the valve knob will decrease the system pressure and will decrease the
output from the tips. Screwing the valve knob in will increase the system pressure and will increase the
output from the tips.
• If the output from the nozzles is drastically different from the values listed above, there may be other
problems with the system. Refer to section 8, FAULT ISOLATION.