Chapter 7
46 SCS 660 & 660M Serial Interface for Granular Applications Installation & Service Manual
Rate Control Issues
The SPEED is inaccurate or unstable.
(Wheel drive speed sensor)
1. Check the speed sensor.
c. Run a speed check on a hard surface road.
d. If the speed is accurate, move the speed sensor to a
different wheel and perform a recheck.
2. Check the magnets.
a. Remove one red magnet and one black magnet on the
wheel.
b. Reposition the remaining red and black magnets directly
across from each other.
c. Enter a SPEED CAL number in the console twice as large
as the correct SPEED CAL number.
d. Run a speed check on a hard surface road.
e. Remove the two magnets and replace them with the other
magnets previously removed.
f. Run a speed check on a hard surface road.
• If the speed is accurate with only one set of magnets,
replace the bad set of magnets.
• If the speed is inaccurate with both sets of magnets,
replace the speed sensor assembly.
Important: Re-enter the original SPEED CAL figure after
testing is complete.
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.
Issue Corrective Action
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