Manual No. 016-3001-015 Rev. C 261
The following procedure should be performed more frequently if the flow meter is used with harsh chemicals or
in anhydrous ammonia.
1. Remove the flow meter from the application system and flush with clean water.
2. If necessary, dismantle the flow meter housing.
3. Remove the turbine hub and turbine from the flow meter.
4. Clean the turbine hub and turbine and remove any metal filings or other foreign materials such as wettable
powders.
5. Check the turbine blades for wear or damage. Refer to the flow meter replacement parts sheet provided
with the flow meter and replace the turbine as necessary.
6. While holding the turbine hub, spin the turbine. The turbine should spin freely with very little drag within the
turbine hub. Refer to the flow meter replacement parts sheet provided with the flow meter and replace the
turbine hub/turbine assembly as necessary.
7. Reassemble the flow meter.
8. Using a low pressure jet of air (5 PSI [34 kPa]), verify that the turbine still spins freely after reassembly. If
the turbine drags or does not move, loosen the hex stud on the bottom of the turbine hub 1/16 turn until the
turbine spins freely.
9. If the flow meter continues to provide inaccurate product volumes, refer to the Testing the Flow Meter/
Encoder Cable section on page 267.
Flow Meter Recalibration
The calibration value for the specific flow meter is printed on the tag attached to the flow meter and will typically
provide accurate metering of product application. The following procedure may be used to check the meter
calibration or recalibrate the flow meter.
Note: Performing routine maintenance is recommended to help extend the service life and accuracy of
the flow meter. Review the Flow Meter Service and Maintenance section on page 260 to service
the flow meter as necessary.
Before calibrating the flow meter:
1. It is recommended to perform the flow meter calibration with clean water only. Clean out the supply tank
and flush the product lines with clean water. Refill the tank with clean water.
2. On the field computer, verify any active jobs are closed.
3. Toggle all boom section switches and the master section switch to the off position.
4. Disconnect one of the section product lines near the spray tips.
5. Set up a calibrated catch container (i.e. 5 gallon [19 L] bucket and place the disconnected end of the
product line in the container.
To recalibrate the flow meter:
1. On the field computer Home screen, touch the Tools Menu icon.
2. Select the Product Control icon from the System menu.
3. On the Product Control Configuration screen, touch the Calibration Settings button.
4. Select the Meter Cal value and use the on-screen keypad to enter a value of 10 [38].
5. Touch the Accept icon until the Product Control Configuration screen is displayed.
6. Touch the Volume/Area Settings button.
7. Touch the Total Volume button and use the on-screen keypad to enter a value of 0.
8. Touch the Accept icon to return to the Volume/Area Settings screen.
9. While monitoring the Total Volume on the screen and the container, toggle the master switch and the
appropriate section switch to the on position.
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