TROUBLESHOOTING 8
en-57
No steering (Electric steer-
ing system)
Check if Seat Switch is functioning. Check
MCU LED #24 should be on when on seat
and off when off seat.
Check switch and harness connection.
SCU does not have power.
Check to see if circuit breaker 5 is tripped.
Fault Code on LDU
Review any fault codes and take appropriate
action.
Overcurrent protection device in PDU
tripped. Check for open connection or
shorted wire to GND for SCU logic power.
Cycle power once corrected.
Proximity switches dirty.
Clean all dirt or debris from proximity switch.
Check for obstructions that may interfere
with switch operations.
Manual Actuator Mode not
working
Park brake off. Check LDU Park Brake LED
should be on.
Cycle power.
No CAN communication.
Check connections.
Fault Code on LDU
Review any fault codes and take appropriate
action.
Mow switch is in ON position.
Ensure Mow switch is in OFF position.
One or more reel motors
won't run
Mow switch is in OFF position.
Ensure Mow switch is in ON position.
Reel enable switches are in OFF position.
Ensure to enable reels.
Machine not moving. (applicable if FOC is
not zero)
Reel motors should come on when machine
starts moving forward.
Fault Code on LDU
Review any fault codes and take appropriate
action.
No power to reels. When actuators are down
check RCU LED's #8 for Left, #14 for Cen-
ter, #7 for right should be on.
Check PDU circuit breakers for tripped: CB3
for left, CB2 for center, CB1 for right.
Reel motor temperature or
current high when mowing.
Excessive amount of grass being cut.
Reduce mower speed, increase FOC, or
change height of cut.
Actuators raise and motors
shut off while mowing
Low Battery Power. LDU-Red 48V Battery
LED will be on.
Recharge Batteries.
Reel or Actuator Fault. LDU-Yellow Caution
LED will be on.
Review fault codes to determine which reel
or actuator is faulted.
Steering wheel has no
resistance
Overcurrent protection device in PDU
tripped. Check for open connection or
shorted wire to GND for Lord brake, Lord
protection diode.
Cycle power once corrected.
Headlights
don't
turn
on
Overcurrent protection device in PDU
tripped. Check for open connection or
shorted wire to GND for headlight(s).
Cycle power once corrected.
Genset overheating.
Genset fan not running. Overcurrent protec-
tion device in PDU may be tripped. Check
for open connection or shorted wire to GND
for genset fan 12V power.
Cycle power once corrected.
