Great Plains 2510HDP Operator Manual - Manual (Page 99)

Great Plains Manufacturing, Inc. Table of Contents Index Hydraulic Drive Operation 95
2013-10-21 Table of Contents Index 118-245M
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, significant torque
problems are present.
5. Check Speed signal (if drive rotates in calibration
mode but not when planting)
Rapid drive rotation may occur and cause serious
injury.
a. No signal from speed sensor - check connection
at sensor and at drive controller.
b. Excessive gap between wheel sensor and sen-
sor plate - readjust to .030.
c. Use Speed Simulator (p/n 27858) to trouble-
shoot 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 con-
troller; 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 Ser-
vice Department.
Drive rotates but not at desired speed:
1. Drive (out rate) fluctuating erratically:
a. If indicated field speed on drive is also fluctuat-
ing erratically, troubleshoot speed signal loop.
b. If field speed is steady, check for loose set
screws on motor encoder, contamination of pro-
portional valve, or mechanical binding of chain
on row unit.
2. 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.
3. 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.
4. Drive will not achieve desired rate:
a. Recheck calibration number and rerun calibra-
tion procedure if necessary.
b. Check to make sure that your desired rate is
within the range of the meter that is installed.
c. Inadequate hydraulic flow. Adjust flow control 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 Assembly
and Parts Manuals for the planter you are oper-
ating (30P and 40P models).
f. Check speed shown on cab console against
other speedometer - tractor, planter monitor. If
drive speed is significantly lower, recalibrate
speed on drive.
5. Drive plants significantly higher than desired rate:
a. Recheck calibration number and re-run calibra-
tion procedure if necessary.
b. Ensure that you have installed the correct seed
meter.