Hydraulic drive troubleshooting, Drive will not rotate – Great Plains 3N-4025P Operator Manual User Manual
Page 134
130
3N-40P
Great Plains Manufacturing, Inc.
196-538M
2014-01-29
Hydraulic Drive Troubleshooting
Drive will not rotate:
(see Troubleshooting Flow Chart and Electronics
Overview, page 133 and page 134)
1.
Check cab console:
a.
No power to cab console - check with voltmeter.
b.
Upper line (set) is visible but no lower line (out
rate and speed) on display: move to
Communication troubleshooting below.
c.
1 or 10 amp fuse on power cable may be blown.
d.
Engage button is not on - check to see if green
indicator light is on.
e.
Use Cab Console Power Tester (p/n 27857) to
check power out of cab console. Install tester on
round 7-pin power/comm cable from cab
console. Turn drive on. Green LED shows power
to external controller. Red LED shows power to
solenoid. If LED lights are not lit, double-check
power and connections; replace cab console if
needed.
2.
Check communication between cab console and
drive:
a.
Check to see if power and communication cable
(main harness) is properly connected.
b.
If no lower line on cab console appears (speed
and output rate), and drive will not rotate in
calibration mode, use Cable Continuity Tester
(p/n 27859) to test power and communication to
external controller.
TO PREVENT DAMAGE TO COMPONENTS, DISCONNECT
POWER/COM CABLE FROM CAB CONSOLE AND
EXTERNAL CONTROLLER BEFORE INSTALLING THIS
TESTER.
Install 4-pin test plug on end of 4-pin
power/comm cable before powering the Cable
Continuity Tester - remove before reattaching
power/comm cable directly to cab console.
c.
If Cable Continuity Tester shows power is getting
to external controller, turn power off and remove
Cable Continuity Tester and 4-pin test plug from
ends of power/comm cable. Reattach
power/comm cable to cab console and external
controller.
d.
If power/comm cable tester shows power and
communication is reaching external controller
from cab console, and no lower line appears on
cab console, replace chip or external controller.
Call Service Department.
e.
If Cable Continuity Tester (p/n 27859) isn’t
available, check cable with voltmeter at
connection at control module.
3.
Test Relay inside external controller:
a.
Use Relay Output Tester (p/n 27860) to test relay
inside external controller. Install tester to
weather-pak solenoid connector from external
controller. With tractor engine off, start drive
calibration function. Auditory alarm should buzz
for 1.5 seconds when drive is engaged in
calibration mode. If no alarm, relay or external
controller may need replacing. Call Service
Department.
4.
Check hydraulics:
a.
Check hydraulic lever is in detent position.
b.
Hydraulic lever is in wrong detent direction - a
check valve at outlet of motor prevents reverse
rotation.
c.
Make sure that both hoses are properly
connected to tractor remotes.
d.
Inadequate system pressure. Gauge pressure at
filter and check reading. If system pressure is
below tractor specifications, check system.
e.
Power solenoid directly:
Rapid drive rotation may occur causing serious injury.
i.
Disengage hydraulics.
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 (p/n 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 or
swelled grain wedged in meters, frozen