Great Plains 3N-4025P Operator Manual - Manual (Page 126)

3N-4010P, 3N-4015P, 3N-4020P and
3N-4025P
196-286M 4/23/2010
124
Troubleshooting
Drive will not rotate: (see Troubleshooting flow chart and electronics overview pages 9-10)
1. Check cab console:
a. No power to cab console - check with voltmeter.
b. Upper line (set) is visible but no lower line (out rate and speed) on display: move to Communication
troubleshooting below.
c. 1 or 10 amp fuse on power cable may be blown.
d. Engage button is not on - check to see if green indicator light is on.
e. Use Cab Console Power Tester (PN 27857) to check power out of cab console. Install tester on round
7-pin power/com cable from cab console. Turn drive on. Green LED shows power to external control-
ler. Red LED shows power to solenoid. If LED lights are not lit, double-check power and connections;
replace cab console if needed.
2. Check communication between cab console and drive:
a. Check to see if power and communication cable (main harness) is properly connected.
b. If no lower line on cab console appears (speed and output rate), and drive will not rotate in calibration
mode, use Cable Continuity Tester (PN 27859) to test power and communication to external control-
ler. (WARNING: TO PREVENT DAMAGE TO COMPONENTS, DISCONNECT POWER/COM CA-
BLE FROM CAB CONSOLE AND EXTERNAL CONTROLLER BEFORE INSTALLING THIS
TESTER). Install 4-pin test plug on end of 4-pin power/com cable directly to cab console.
c. If Cable Continuity Tester shows power is getting to external controller, turn power off and remove Ca-
ble Continuity Tester and 4-pin test plug from ends of power/com cable. Reattach power/com cable to
cab console and external controller.
d. If power/com cable tester shows power and communication is reaching external controller from cab
console, and no lower line appears on cab console, replace chip or external controller. Call Service
Department.
e. If Cable Continuity Tester (PN 27859) isn’t available, check cable with voltmeter at connection at con-
trol module.
3. Test relay inside external controller:
a. Use Relay Output Tester (PN 27860) to test relay inside external controller. Install tester to weather-
pak solenoid connector from external controller. With tractor engine off, start drive calibration func-
tion. Auditory alarm should buzz for 1.5 seconds when drive is engaged in calibration mode. If alarm
does not sound, relay or external controller may need to be replaced. Call Service Department.
4. Check hydraulics:
a. Check to see if hydraulic lever is in detent position.
b. Hydraulic lever is in wrong detent direction - a check valve at outlet of motor prevents reverse rotation.
c. Make sure that both hoses are properly connected to tractor remotes.
d. Inadequate system pressure. Place pressure gauge at filter and check reading. If system pressure is
below tractor specifications, check system.
e. Power solenoid directly: DANGER! RAPID DRIVE ROTATION MAY OCCUR AND CAUSE SERIOUS
INJURY. KEEP CLEAR OF DRIVE AREA.
i. Disengage Hydraulics
ii. Reduce flow to 30-50%
iii. Power solenoid directly by connecting power weather-
pak connector to solenoid weather-pak connector. If drive
doesn’t rotate, proportional coil (PN 19799) may be defec-
tive. Check continuity with meter, or energize with 12v power and check for magnetic pull with small
screwdriver. Double-check connections on solenoid cable. If solenoid energizes but drive does not ro-
tate when powered directly, tractor hydraulics are not properly engaged.
Rapid drive rotation may occur and
cause serious injury.