3PYPA
Table of Contents
Index
Troubleshooting
Great Plains
| 401-647M | 2019-06-11
Table of Contents
Index
99
Steering Troubleshooting
Always check any steering switch box flash error codes
before searching for other causes of problems.
See “
Steering with Module Control
” on page 31 for
switch box operations.
Then see “
Steering Flash Error Codes
” on page 100.
The chart below presumes that the switch box is
reporting normal operation.
Problem
Cause
Solution
Any
Most that cannot be corrected in place
If the planter must be moved for repairs, or planting must continue
without steering, see “
Emergency Moves Without Steering
” on
page 113. Make ONLY careful forward moves unless tie rods and
caster stops are removed.
Casters turn
abruptly at
system
power-up
This is normal if the tractor steering at
hitching is substantially different from
that at unhitching
Keep all persons away from casters at power-up. Allow no one on
the walkboard at power-up.
To minimize caster movement at power-up, unhitch
and re-hitch with the tractor steering in a consistent
orientation, usually straight ahead.
No steering
Hydraulic hoses not connected
Correctly connect steering hydraulics (page 20).
Steering sense line not connected
Correctly connect steering hydraulics (page 20).
Power-Beyond hoses reversed
Correctly connect steering hydraulics (page 20).
Power-Beyond sense line disconnected
Correctly connect steering hydraulics (page 20).
No pressure at Power-Beyond port
Unless there is a valve for the port, that is shut off, this is a tractor
system malfunction
Steering manifold valve malfunction
Have dealer check solenoid coils and plungers.
Tractor sensor failed (other than open
circuit or short to ground)
Check for obvious mechanical problems (such as loose
fasteners). Replace failed or damaged sensor.
Caster sensor failed (other than open
circuit or short to ground)
Check for obvious mechanical problems (such as loose
fasteners). Replace failed or damaged sensor.
ECU does not
power up
(no lights on
switch box)
Fuse blown
Check fuse, located at + battery terminal. If blown, check for
underlying problem before using system:
1. Set STEER switch off on console.
2. Disconnect harness to ECU
(ECU has standby power, even with console off).
3. Replace fuse.
4. Switch on console - check fuse.
If OK, switch off console and continue.
5. Connect ECU harness. Check fuse. If OK, continue.
6. Switch on console and check fuse.
Power input disconnected or damaged.
Check voltage at 70-pin ECU plug, with console on:
Pins 1 and 2, then Pins 2 and 3
Low battery voltage
Check tractor voltage. Must be between 10 and 16Vdc.
Steering
doesn’t match
tractor
Calibration needed
Perform a steering calibration (page 109). If calibration does not
solve the problem, check for damaged sensor.
No caster float
in transport
No radar signal (seen by ECU as 0 mph) Check radar Y-cable connection and radar function
Disengage speed not set to proper value
in ECU setup
Contact Great Plains support. If the ECU firmware was recently
updated, there may be other incorrect settings.
