Great Plains 2420P Operator Manual - Manual (Page 88)

2410P and 2420P
118-769M 2012-04-17
86
a. units with radar speed signal).
b. Check setting of speed signal interrupter switch - reposition as necessary to keep actuator from disengaging
while planting.
c. 1.5 second delay shutting off drive - causes: chain binding, inadequate hydraulics
1. Drive will not achieve desired rate
a. Re-check calibration number and re-run calibration procedure if necessary.
b. Ensure that you have installed the correct seed meter.
c. Check sprocket combinations; see Assembly and Parts Manuals for the planter you are operating (30P and 40P
models).
d. Check speed shown on cab console against other speedometer - tractor, planter monitor. If drive speed is sig-
nificantly lower, recalibrate speed on drive.
2. Drive plants significantly higher than desired rate
a. Re-check calibration number and re-run calibration procedure, if necessary.
b. Ensure that you have installed the correct seed meter.
c. Check sprocket combinations; see Assembly and Parts Manuals for the planter you are operating (30P and 40P
models).
d. Check speed shown on cab console against other speedometer - tractor, planter monitor. If drive speed is sig-
nificantly higher, recalibrate speed on drive.
3. Drive continues to rotate after tractor has stopped
a. Contamination or wear in proportional valve (PN 19798). Remove and inspect. Blow out with compressed air.
Check o-rings and reinstall. Replace if necessary.
4. Fluid weeping from motor shaft seal
a. Excessive back pressure in return hose. Check quick coupler connection. Use motor control port for return if nec-
essary.
Calibration Troubleshooting
5. If the time to run for calibration is less than 4 seconds, the cab console will display TIME TOO LOW. Pressing the
FUNCTION key will bring up the ENTER TARGET AMOUNT screen. The target should be raised to increase the cal-
ibration time. If the time is greater than 255 seconds, the cab console will display TIME TOO HIGH. Pressing the
FUNCTION key will bring up the ENTER TARGET AMOUNT screen. The target should be lowered to decrease the
calibration time.
6. While rate calibration is running, one of four error messages may be displayed:
Message Cause Solution
COMM TIMEOUT Power to or communication with
the external controller was inter-
rupted during calibration.
Check power and communica-
tion connections from the cab
console to the external controller
and re-run calibration.
TIME OVER LIMIT The external controller ran too
long in calibration.
Re-run calibration. If the same
message appears, call technical
support.
USER TERMINATED The engage key was pressed
during calibration.
Re-run calibration.
CALIBRATE ERROR The drive did not turn when cali-
bration began.
Check encoder cable and con-
nection, solenoid cable and con-
nection, and hydraulic lever
position.
Pressing FUNCTION will exit rate calibration from these error screens.