Great Plains 1525P Operator Manual - Manual (Page 94)

1525P, 1510HDP
118-949M 8/14/2006
92
1. Check Speed signal (if drive rotates in calibra-
tion mode but not when planting)
a. No signal from speed sensor - check con-
nection at sensor and at drive controller.
b. Excessive gap between wheel sensor and
sensor plate - re-adjust to .030.
c. Use Speed Simulator (part #27858) to trou-
bleshoot speed loop. Leave tractor station-
ary and drive hydraulics do not need to be
engaged.
!
DANGER
Rapid drive rotation may occur and cause serious injury.
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 sim-
ulated speed appears on cab console.
f. Test hall effect module and cable to exter-
nal controller; replace module and cable if
simulated speed appears on cab console.
If speed does not appear with speed simu-
lator, external controller or chip may need
replacement. Call Service Department.
Drive rotates but not at desired speed:
2. Drive (out rate) fluctuating erratically
a. If indicated field speed on drive is also fluc-
tuating erratically, troubleshoot speed sig-
nal loop.
b. If field speed is steady, check for loose set
screws on motor encoder, contamination of
proportional valve, or mechanical binding
of chain on row unit.
3. Indicated speed fluctuating erratically
a. Use speed simulator to troubleshoot speed
loop. Leave tractor stationary and drive hy-
draulics 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 con-
troller 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.
4. 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 - re-position as necessary to keep
actuator from disengaging while planting.
c. 1.5 second delay shutting off drive - causes:
chain binding, inadequate hydraulics.
5. Drive will not achieve desired rate
a. Re-check calibration number, and re-run
calibration procedure if necessary.
b. Check to make sure that your desired rate is
within the range of the meter that is in-
stalled.
c. Inadequate hydraulic flow. Adjust flow con-
trol to higher position. Check with flow meter
if flow is suspect.
d. Field speed too high. Check maximum
planting rate in seed chart for rate that you
are planting.
e. Check sprocket combinations; see Assem-
bly and Parts Manuals for the planter you
are operating (30P and 40P models).
f. Check speed shown on cab console against
other speedometer - tractor, planter moni-
tor. If drive speed is significantly higher,
recalibrate speed on drive.
6. Drive plants significantly higher than desired
rate
a. Re-check calibration number, and re-run
calibration procedure if necessary.
b. Ensure that you have installed the correct
seed meter.
c. Check sprocket combinations; see Assem-
bly and Parts Manuals for the planter you
are operating (30P and 40P models).
d. Check speed shown on cab console agains
other speedometer - tractor, planter moni-
tor. If drive speed is significantly higher,
recalibrate speed on drive.
7. Drive continues to rotate after tractor has
stopped
a. Contamination or wear in proportional valve
(PN 19798). Remove and inspect. Blow out
with compressed air. Check o-rings and re-
install. Replace if necessary.
8. Fluid weeping from motor shaft seal
a. Excessive backpressure in return hose.
Check quick coupler connection. Use motor
control port for return if available.