Great Plains 2025P Operator Manual - Manual (Page 102)

2025P, 2020P Bedded, and
2010HDP
118-928M 8/14/2006
100
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 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 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, misaligned chains, or swelled grain in meter. Install pressure
gauge at motor inlet. Pressure should be 1000-1500 psi. If pressure is above 2000 psi, signif-
icant torque problems are present.
5. 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 engaged.
d. Test speed sensor and hall effect sensor; replace sensor if simulated speed appears on cab
console.
e. Test speed cable between speed sensor and hall effect module; replace 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 con-
troller or chip may need replacement. Call Service Department.
Drive rotates but not at desired speed:
6. 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 propor-
tional valve, or mechanical binding of chain on row unit.
7. 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 controller 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.
8. 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 units with radar speed signal).
b. Check setting of speed signal interrupter switch - reposition as necessary to keep actuator from
disengaging while planting.
c. 1.5 second delay shutting off drive - causes: chain binding, inadequate hydraulics.
9. Drive will not achieve desired rate:
a. Recheck calibration number and rerun calibration procedure if necessary.