Manual No. 016-0159-822 Rev E 53
PREVENTATIVE MAINTENANCE AND TROUBLESHOOTING
7
RATE CONTROL ISSUES
Issue Corrective Action
The RATE displays as “0000”.
1. Verify that the SPEED is registering correctly. If the speed is zero,
refer to the “The SPEED is inaccurate or unstable” issue in the
Console Issues section for the appropriate troubleshooting steps.
2. Verify that the TOTAL VOLUME is registering flow. If not, refer to
the “Total volume does not register” issue in this section.
The RATE is inaccurate or unstable.
1. Verify that all values are entered into the console correctly.
2. Verify that the SPEED is registering accurately. If it is inaccurate,
refer to the “SPEED is inaccurate or unstable” issue in the Console
Issues section for the appropriate troubleshooting steps.
3. In MAN (manual) operation, verify that the RATE display (GPA)
holds constant. If not, refer to the “Total volume registers flow
inaccurately” issue in this section.
4. In MAN operation, check the low end and high end pressure
range. If pressure cannot be adjusted manually, refer to the “Total
volume registers flow inaccurately” issue in this section.
5. If the problem persists, return the console to the dealer to have
the processor board assembly replaced.
Cannot vary the RATE in automatic or
manual operation.
1. Check the cabling to the motorized control valve for breaks in the
line.
2. Verify the cable connections are clean.
3. Verify that there is voltage to the valve connector.
a. Turn the Master switch ON.
b. Switch the RATE 1/RATE 2/MAN switch to MAN.
c. Turn the POWER switch ON.
d. Manually operate the INC/DEC switch to verify voltage.
4. Verify that the valve is turning. If not, replace the motorized
control valve.
The sprayer pressure is correct, but the
RATE is low.
1. Verify that the nozzle strainer screens and check valves are not
plugged.
2. Verify that the pressure at each boom is the same.
3. Verify that all nozzles are of the correct and same orifice size.
Refer to the Calculate the Rate 1 and Rate 2 Cal Values section on
page 8 for the proper method to determine nozzle size.
TOTAL VOLUME does not register.
1. Check the flow meter cable for breaks and shorts. Refer to the
Testing Flow Meter Cables section on page 48.
2. Clean, adjust, and check the flow meter parts. Refer to the Flow
Meter Preventative Maintenance and Adjustment section on
page 47.
3. Replace the flow meter transducer.
TOTAL VOLUME registers the flow
inaccurately.
Verify that the arrow on the flow meter is pointing in the direction of
the flow. Refer to the Flow Meter Preventative Maintenance and
Adjustment section on page 47 and the Recalibrating the Flow Meter
section on page 48.
Motorized control valve rotates more
than 1/4 turn.
Replace the motorized control valve.
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