JLG 1250AJP Service Manual - Manual (Page 487)

SECTION 6 - JLG CONTROL SYSTEM
3121171 – JLG Lift – 6-55
• During calibration if the main boom becomes
extended the Control System will abort the calibra-
tion sequence and the analyzer will display “CAL
FAILED” and “MAIN EXTENDED”. Continue to dis-
play “CAL FAILED” and follow the electrical
retrieval system sequence for positions of back-
ward stability concern until all transport positions
are met or the power is cycled. Refer to Section
4.9, Electrical Retrieval System.
Step 1 - Position 1
1. After the machine is in Position 1, using the analyzer,
put the machine into Access Level 1 and enter the
“BOOM SENSORS” calibration.
The analyzer will read:
After pressing the ENTER key , the Control
System will verify the load pin, main boom angle,
tower boom angle, tower lift cylinder rotary angle,
and tower boom length sensors are reporting valid
data, the axles are completely extended, the wheels
are straight within 10, the tower length sensors are
reading less than 8.41 inches plus 6.39 inches
(21.36 cm plus 16.23 cm) of tolerance for the upper
length and 12.47 inches plus 6.39 inches (31.67 cm
plus 16.23 cm) of tolerance for the lower length,
tower boom transport length, main boom transport
length, and main boom dual capacity length, limit
switches are all in the retracted positions, the main
boom transport angle switch is in the transport posi-
tion, the tower lift cylinder rotary angle sensor reads
less than 21.5 +15 of tolerance, the drive orienta-
tion switch is indicating the turntable is between the
rear tires, the jib aligned switch is on, the chassis tilt
sensor reads less than 1.5 out of level, the steering
and tilt sensor calibrations have been successfully
completed, and the machine is in Ground Mode.
If these conditions are not met, the analyzer will
prompt the operator with any of the following ana-
lyzer messages necessary to satisfy the initial condi-
tions.
• “BLAM CAN LOST”
• “AXLE VALVE FAULT”
• "OSC AXL SW FAULT”
• “PARK BRAKE FAULT”
• “LOAD PIN FAULT”
• “MAIN ANGL1 FAULT”
• “MAIN ANGL2 FAULT”
• “TWR ANGL1 FAULT”
• “TWR ANGL2 FAULT”
• “CYL ANGL FAULT”
• “TWR LEN1 FAULT”,
• “TWR LEN2 FAULT”
• “EXTEND AXLES”
• “CENTER WHEELS”
• “TOWER IN”
• “MAIN DOWN”
• “TOWER DOWN”
• “RETRACT MAIN”
• “ALIGN TURNTABLE”
• “CENTER JIB SWING”
• “LEVEL MACHINE”