Great Plains 2420P Operator Manual - Manual (Page 87)

2012-04-17 118-769M
85 Veris Drive Operating Instructions
1. 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 trac-
tor 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 rotate
when powered directly, tractor hydraulics are not properly engaged.
f. Excessive torque in drive system. Disconnect main drive chain to check for rotation under zero load. Check for
a problem with the mechanical portion of drive, such as foreign material wedged in meter, frozen bearings, mis-
aligned chains, or swelled grain in meter. Install pressure gauge at motor inlet. Pressure should be 1000-1500
psi. If pressure is above 2000 psi, significant torque problems are present.
2. Check speed signal (if drive rotates in calibration mode but not when planting)
a. No signal from speed sensor - check connection at sensor and at drive controller.
b. Excessive gap between wheel sensor and sensor plate - readjust to .030.
c. Use Speed Simulator (PN 27858) to troubleshoot speed loop.
Leave tractor stationary and drive hydraulics do not need to be en-
gaged.
d. Test speed sensor and hall effect sensor; replace sensor if simulat-
ed speed appears on cab console.
e. Test speed cable between speed sensor and hall effect module; re-
place cable if simulated speed appears on cab console.
f. Test hall effect module and cable to external controller; replace module and cable if simulated speed appears on
cab console. If speed does not appear with speed simulator, external controller or chip may need replacement.
Call Service Department.
Drive rotates but not at desired speed:
3. Drive (out rate) fluctuating erratically
a. If indicated field speed on drive is also fluctuating erratically, troubleshoot speed signal loop.
b. If field speed is steady, check for loose set screws on motor encoder, contamination of proportional valve, or me-
chanical binding of chain on row unit.
4. Indicated speed fluctuating erratically
a. Use speed simulator to troubleshoot speed loop. Leave tractor stationary and drive hydraulics do not need to be
engaged. If steady speed between 4 -10 mph appears on cab console using speed simulator, troubleshoot radar,
wheel pickup sensor, hall effect module. If steady speed does not appear with speed simulator, external control-
ler may need replacement. Call Service Department.
b. Check radar gun angle.
c. Check gap between wheel sensor and pickup plate.
d. Check power to system < 12 volt power will cause drive to behave erratically - often problem manifests itself in
speed loop.
5. Drive shuts off while planting
a. If it occurs after 20 seconds of not planting, such as turning on headlands, operation is normal safety shutoff (on
Rapid drive rotation may occur and
cause serious injury.
Rapid drive rotation may occur and
cause serious injury.