Great Plains 3PYPA Operator Manual - Manual (Page 101)

Great Plains Manufacturing, Inc. Table of Contents Index Troubleshooting 97
03/20/2012 Table of Contents Index 401-647M
Steering Troubleshooting
Always check any steering switch box flash error codes
before searching for other causes of problems.
See “Steering” on page 28 for switch box operations.
Then see “Steering Flash Error Codes” on page 99.
The chart below presumes that the switch box is report-
ing normal operation.
Steering Troubleshooting (other than flash error codes)
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 With-
out Steering” on page 111. 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.
Note: 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 19).
Steering sense line not connected Correctly connect steering hydraulics (page 19).
Power-Beyond hoses reversed Correctly connect steering hydraulics (page 19).
Power-Beyond sense line discon-
nected Correctly connect steering hydraulics (page 19).
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 dam-
aged. 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 107). If calibration
does not solve the problem, check for damaged sensor.