Great Plains 2025P Operator Manual - Manual (Page 101)

8/14/2006 118-928M
99 Veris Drive Operating Instructions
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 Commu-
nication 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 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 cal-
ibration mode, use Cable Continuity Tester (PN 27859) to test power and communication to
external controller. (WARNING: TO PREVENT DAMAGE TO COMPONENETS, DISCON-
NECT POWER/COM CABLE FROM CAB CONSOLE AND EXTERNAL CONTROLLER BE-
FORE 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 di-
rectly to cab console.
c. If Cable Continuity Tester shows power is getting to external controller, turn power off and re-
move Cable 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 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 function. Auditory alarm should buzz for 1.5 seconds when drive is engaged in cal-
ibration 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 SE-
RIOUS INJURY. KEEP CLEAR OF DRIVE AREA.
i. Disengage hydraulics