JLG 1850SJ Service Manual - Manual (Page 337)

SECTION 6 - JLG CONTROL SYSTEM
3121619 – JLG Lift – 6-55
6.8 CALIBRATION PROCEDURES
Axle Calibration
The axle angle sensors need to be calibrated to ensure that the
axle angle can be accurately calculated. The machine must be
in transport position to perform an axle calibration. If the steer
sensors have not been calibrated, they will be calibrated as
part of the axle calibration procedure.
Axle Calibration is available under AXLE SWING under the CAL-
IBRATIONS menu using the analyzer.
When performing a calibration, the first prompt will be to
RETRACT AXLES.
The analyzer will prompt to move to the next sequence once
the axle retract conditions are met and retract values are
stored in the Control System.
If the steer sensors have not been calibrated when an axle cali-
bration is attempted, the system shall require the steer sensors
be calibrated. If this is the case, the analyzer prompt shall auto-
matically redirect to the steer sensor calibration section after
the axle retract position is calibrated (Refer to steer sensor cali-
bration). If the steer sensors have been calibrated, this step
shall be skipped.
The analyzer will prompt to EXTEND AXLES.
The analyzer shall prompt to move after the extend conditions
are met and extend values are stored in the Control System.
The axle calibration is complete at this point.
Boom Sensor Calibration
Initial conditions prior to initiating boom sensor calibration:
• Steering sensor, tilt sensor, and telescope crack point cali-
brations are complete
• Axle calibration is complete
• Chassis tilt calibration is complete
• Ensure the axles are completely extended and axle set
lamp is ON
• Ensure the wheels are straight
• Ensure the platform is unloaded and boom is clean
• Ensure the jib is horizontal
• Ensure the jib swing is centered if Jib swing is configured
• Ensure the platform is level
• Ensure the platform is not rotated
• Ensure the turntable is centered between the rear tires
• Ensure the boom is fully retracted
• Ensure the machine indicates that it is on a level surface +/-
1.5°
• Ensure Ground Mode is selected
General notes:
During all controller lag times the controller should display
“CALIBRATING…”
After each operator “ENTER” input preceding the recording of
sensor values, the controller will wait 10 seconds for the boom
dynamics to settle down before readings are taken.
During the calibration if the ESC key is pressed after the cali-
bration procedure is started, the calibration will be aborted
and “CAL FAILED” will be displayed on the bottom line of the
analyzer and the previous calibration values will be used for
the boom sensors.
1. With the analyzer, put the vehicle into Access Level 1
and enter the “BOOM SENSORS” calibration. The Con-
troller will display “CAL. POSITION 1” on the top line and
“CHECK SYSTEM?” on the bottom line.
2. After the operator presses the ENTER key, the controller
will verify:
• the angle sensors and length sensors are reporting valid
data,
• the axles are completely extended,
• the wheels are straight within 10°,
• the Boom Length Limit switch is in the retracted position,
• the drive orientation switch is indicating the turntable is
between the rear tires,
• the Jib aligned switch is on if equipped,
• the chassis tilt sensor reads less than 1.5° out of level,
• the machine is in Ground Mode and the steering, tilt sensor
calibrations have been successfully completed,
• Jib Transport sensors are healthy,
• the Jib Level, Jib Swing, Main Cylinder Angle, Jib Lift, Plat-
form Level Cylinder Position and turntable sensors are
healthy,
• the Jib is fully retracted and the Jib Pin is Locked,
• if Model 1850 the axle calibration has been performed.