Great Plains 2525P Operator Manual - Manual (Page 97)

4/23/2010 118-915M
95 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 Communication trouble-
shooting 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 calibration 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 CON-
SOLE 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 pow-
er/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 cable to cab con-
sole 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 mod-
ule.
3. Test Relay inside external controller:
a. Use Relay Output Tester (PN 27860) to test relay inside external controller. Install tester to weather-pak so-
lenoid 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 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 INJU-
RY. KEEP CLEAR OF DRIVE AREA.
i. Disengage hydraulics.
ii. Reduce flow 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 defective. 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 rotate when pow-
ered directly, tractor hydraulics are not properly engaged.
Rapid drive rotation may occur and
cause serious injury.