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LeeBoy 8520C Conveyor Paver 4-25
Operation
Plus One Controller
The Plus One is a 50-pin controller operating in the
background that monitors paver control systems and
alerts the operator in the event of a fault. When the
Plus One controller senses a system fault, the Plus
One light on the control panel (Figure 4-50) illuminates
green and blinks continuously or blinks, then pauses,
then blinks again. A complete list of fault codes with
corrective action messages are shown in Section 5,
Troubleshooting.
Figure 4-50. Plus One Light
When the key is turned on, the Plus One light will
illuminate for approximately three seconds while the
controller powers up, then turn off when the machine
is ready to start. The Plus One will not allow the engine
to start if any joystick is out of neutral or more than one
Run/Stop switch is in the RUN position.
These faults will prevent machine movement:
• Steering control box not detected.
• Joystick(s) not in neutral at start-up.
• Pump control coil fault.
• Brake valve/pump neutral bypass coil fault.
• The fault happens in the steering control box that has
control (Run/Stop switch in the RUN position).
• The fault occurs when neither steering control box is
in control.
Figure 4-51. Driving the 8520C
Driving the Paver
The dual operator platforms allow easy and convenient
access for controls of most paver functions. Controls
can also be lowered to operate as a low deck or the
high deck option with an assistant standing on the
screed walkboard.
The paver is usually operated from the left operator
station, but can also be operated from the right side.
Dual joysticks propel and steer the paver. (Figure 4-50
on the following page.) An optional steering wheel
control box is also available. (Page 4-41)
NEVER leave the operator station
unattended while the paver is in gear or in motion.
Operator must return joystick(s) to the neutral posi-
tion and turn the RUN/STOP switch to the STOP posi-
tion before leaving the operator platform.
NOTE: The engine will not start unless the E-STOP
button is disengaged and the joystick must be
in the NEUTRAL (center) position.
Stopping the Engine
1. Place joysticks to the neutral position.
2. Throttle back to idle using settings on the digital
display screen.
3. Turn ignition key on the instrument panel
counterclockwise to the OFF position and remove
key.
NOTE: If the engine does not shut down when key is
turned to OFF, press the E-Stop button on the
control panel to terminate power.
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