SharpShooter
®
with Rate Sync
®
- Turf Sprayer Edition
©2003, 2011, 2015 Capstan Ag Systems, Inc., All Rights Reserved | Version:
P-3.0
| 6/9/2016
9.0 - Troubleshooting
54
Service Actions:
If the rate does not stabilize or achieve the target rate:
1.
Verify that the rate controller speed calibration is set correctly and not to zero.
2.
Verify that rate controller is getting a speed signal.
3.
Verify that the pump is ON, the machine is at full throttle and valves for a Chem Loader attachment are closed.
4.
If using a Test Speed, verify that the boom section switches are switched to manual ON and not to AUTOMATIC
CONTROL.
5.
You may have reached the pump output limit, if a newer pump or if the pump is older and its performance is
decreasing.
6.
The BOOST feature may not be working. Verify that both rows of nozzles are spraying. If only one row is spraying,
check the duty cycle. Increase either your speed or rate toward 80% duty cycle. At 80% duty cycle the BOOST
nozzles should start spraying. Then decrease the duty cycle toward 20%. At 20% duty cycle the BOOST nozzle
should stop spraying and the duty cycle should jump to 40% and then settle in at the appropriate duty cycle for
that rate and speed.
If the rate still does not stabilize or achieve the target rate:
1.
Evaluate for defective flow meter, pump impeller or pump bearing components.
2.
With the rate controller in MANUAL Mode, if the GPM reading DOES NOT stabilize, then either the flow meter,
pump impeller, or pump bearings are worn.
NOTE: A test speed is not always accurate, so the calculated GPM number could be slightly off.
a. If doing a static test verify that the test speed did not go to 0.0 MPH. If so, reset the test speed.
b. If moving, verify that there is a GPS signal of adequate signal strength. You may need to move the sprayer
away from buildings or from under trees. If the issue persists, contact your GPS dealer support.
a. Lower the speed so see if the applied rate matches the target rate. You may need to change the duty cycle
(effective tip size) to maintain your pressure.
b. Alternatively, lower the rate and check again.
a.
Locate the rate controller screen with which you can observe the GPM rate reading as the machine sprays
in the rate controller AUTOMATIC Mode.
b.
If the GPM reading is unstable, switch the rate controller to the MANUAL Mode. This locks for flow control
valve or PWM pump valve and isolates the flow meter.
c.
If the GPM stabilizes, the flow control valve or PUMP PWM control valve is likely defective.
a.
If the sprayer rate is unstable at ALL rates, speeds and pressure, the issue is likely the flow meter.
b.
Set the SSRS to 40 PSI and compare the GPM reading from the rate controller to a calculated GPM using
the unit appropriate formula below:
GPM = (GPA x Speed (mph) x Nozzle Spacing (inches) x Number of Nozzles)/5940
GPM = (GPT x Speed (mph) x Nozzle Spacing (inches) x Number of Nozzles)/136
LPM = (L/Hex x Speed (km/hr) x Nozzle Spacing (cm) x Number of Nozzles)/60,000
