Troubleshooting – Great Plains YP1625 Operator Manual User Manual
Page 94
1625
401-182M
7/12/2005
92
Troubleshooting
Drive will not rotate: (see Troubleshooting Flow Chart and Electronics Overview)
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
controller. Red LED shows power to solenoid. If LED lights are not lit, double-check power and con-
nections; 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 calibra-
tion mode, use Cable Continuity Tester (PN 27859) to test power and communication to external
controller. WARNING: TO PREVENT DAMAGE TO COMPONENTS, DISCONNECT POWER/
COM CABLE FROM CAB CONSOLE AND EXTERNAL CONTROLLER BEFORE INSTALLING
THIS TESTER. Install 4-pin test plug on end of 4-pin power/com cable before powering the Cable
Continuity Tester - remove before reattaching power/com cable directly to cab console.
c.
If Cable Continuity Tester shows power is getting to external controller, turn power off and remove
Cable Continuity Tester and 4-pin test plug from ends of power/com cable. Reattach power/com ca-
ble 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
control 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 rota-
tion.
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 SERI-
OUS INJURY. KEEP CLEAR OF DRIVE AREA.
i.
Disengage hydraulics.
ii.
Reduce flow to 30-50%.