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44 Troubleshooting
TEST SETUP
1. Set valve No. 1 for the GPM of the test.
2. Stop flow with valve No. 2.
3. Clear Total Volume display counter to 0, put
the controller in “RUN.”
4. Open valve No. 2 (use a ball valve, it will
give you fast ON/OFF times).
5. Shut valve No. 2 when tank reaches select-
ed volume.
6. Refer to Step D to determine the Pulse/Gal-
lon.
SERVO BUTTERFLY VALVE
TROUBLESHOOTING
The Servo Valve does the actual controlling or ad-
justing of the flow rate. If the Servo Valve is not
functioning properly the gallons-per-acre readout
will fluctuate by more than +/-10% or the RATE per
acre will remain extremely low or high. If the Servo
Valve is not functioning correctly, the 8605 can still
be used as a monitor by putting the RATE 1, RATE
2 switch in the MANUAL (center) position.
1. See cable and connector trouble shooting.
2. Check calibration question, “Servo loca-
tion?” If the question was answered yes, then
when in MANUAL, the key should OPEN
the valve to increase flow to the boom. If the
question was answered no, then the valve is
mounted in a return line to the tank. In this
case, the key should CLOSE the valve to
increase flow to the boom.
CALIBRATED
TANK
TEST SET-UP
SUPPLY
TANK
PUMP
NO. 1
VALVE TO SET GPM
ON/OFF
NO. 2
BALL VAVLE
FLOWMETER
DWG. NO. 1280
3. Select manual on the Rate 1, Rate 2 switch.
Turn the sprayer pump and valves on, and
press the key. The controller will now send
pulses to the valve. Drive the valve fully open
until the display reads MAX. Select the VPM
display. The console will now read the maxi-
mum gallons per minute that your sprayer
will pump (note this figure). Press and hold
the key until the display reads MIN (approx-
imately 10 seconds). Select the VPM display.
This is the minimum gallons per minute your
sprayer will pump (Note this figure). Now cal-
culate your desired gallons per minute.
MPH = Miles Per Hour
WIDTH = Width of Implement in feet
GPA = Gallons Per Acre
GPM = Gallons Per Minute
MPH X WIDTH X GPA
= GPM
DIVIDE BY 495