Great Plains 3N-4025P Operator Manual - Manual (Page 128)

3N-4010P, 3N-4015P, 3N-4020P and
3N-4025P
196-286M 4/23/2010
126
10. Drive plants significantly higher than desired rate:
a. Recheck calibration number, and rerun 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 significantly higher, recalibrate speed on drive.
11. 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.
12. Fluid weeping from motor shaft seal:
a. Excessive backpressure in return hose. Check quick coupler connection. Use motor control port for re-
turn if available.
Calibration Troubleshooting:
1. 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 in-
crease the calibration 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.
2. While rate calibration is running, one of four error messages may be displayed:
Pressing FUNCTION will exit rate calibration from these error screens.
Message Cause Solution
COMM TIMEOUT Power to or communication with
the external controller was inter-
rupted during calibration. Check power and communication
connections from the cab console
to the external controller and
rerun calibration.
TIME OVER LIMIT The external controller ran too
long in calibration. Rerun calibration. If the same
message appears, call technical
support.
USER TERMINATED The engage key was pressed dur-
ing calibration. Rerun calibration.
CALIBRATE ERROR The drive did not turn when cali-
bration began. Check encoder cable and connec-
tion, solenoid cable and connec-
tion, and hydraulic lever position.