Jacobsen LF 570, Parts & Maintenance Manual

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3 LDU
12
3.1.2 Alarm Codes _____________________
In addition to the lights on the LDU, there are eight
screen displays that are used to alert the operator or
mechanic of a problem the needs to be corrected.
Figure 3B
Low Oil Pressure screen is shown, alarm sounds,
reels stop and raise to full up position, and engine oil
pressure light turns on if engine oil pressure drops
below a safe operating level. Shut mower down
immediately. Inspect oil level in engine.
Hydraulic Oil Filter screen is shown and reels stop
and raise to full up position when filters need to be
replaced. Return mower to service area as soon as
possible and replace filters.
High Engine Temperature screen is shown, alarm
sounds, reels stop and raise to full up position, and
coolant temperature light turns on when coolant
temperature rises above 220° F (110° C). Shut down
unit immediately. Remove debris such as leaves and
grass clippings that may be restricting air flow
through rear screen and radiator.
Low Battery Voltage screen is shown when system
voltage drops below 12 Volts DC. If screen does not
turn off once engine starts, or battery light is also on,
check the battery charging system.
Low Hydraulic Fluid Level screen is shown, alarm
sounds, reels stop and raise to full up position, and
oil level light turns on when hydraulic fluid level in
tank is low. Visually inspect mower for obvious signs
of leaks around connections, hoses, and hydraulic
components.
Pedal and Brake On screen is shown, and alarm
sound, when traction pedal is depressed in either
direction with parking brake switch engaged. Return
traction pedal to Neutral position, and disengage
parking brake switch before attempting to drive
mower.
3.1.3 Diagnostic Screens _______________
As an aid in troubleshooting, the following screens appear if
an open circuit or short circuit is detected on the indicated
output.
Figure 3C
3.1.4 Operator Mode ___________________
When ignition switch is turned to the RUN position, the
alarm will sound and all indicator lights will be on for one
second.
Operator mode is used by the operator to view engine
operating hours, mow switch status, and brake switch
status. The LDU will rotate through the screens every 3
seconds.
Figure 3D
HYDRAULIC
OIL FILTER
LOW OIL
PRE SS URE
HIGH ENGINE
TEMPERATURE
LOW BATTERY
VOLTAGE
LOW HYDRAULIC
FLUID LEVEL
PEDAL AND
BRAKE ON
Alert Di s play s
BRAKE RELEA S E
FAULT
GLOW PLUG
FAULT
FUEL HOLD
FAULT
MOW S OLENOID
FAULT
LIFT S OLENOID
FAULT
LOWER
S OLENOID FAULT
BACKLAP
S OLENOID FAULT
S TARTER RELAY
FAULT
EDC COIL
FAULT
PEDAL OUT
OF RANGE
Dia g no s tic Di s play s
TEMP S EN S OR
OUT OF RANGE
CAN COMM
ERROR
BRAKE
OFF
Di s pl a y s b r a ke
s witch s t a t us .
ENGINE HOUR S
000000.0
MOW S WITCH
ON
Di s pl a y s mow
s witch s t a t us .
Di s pl a y s engine
oper a ting ho u r s .