JLG 1250AJP Service Manual - Manual (Page 499)

SECTION 6 - JLG CONTROL SYSTEM
3121171 – JLG Lift – 6-67
2. After the operator presses the ENTER key , the
Control System will verify that the BCS is in the Nor-
mal state:
• The “AXLE LOCKOUT VALVE – SHORT TO BAT-
TERY OPEN CIRCUIT FAULT”, “OSCILLATING
AXLE PRESSURE SWITCH DISAGREEMENT” and
“BRAKE – SHORT TO BATTERY” faults are not
active
• the axles are completely extended
• the tower is retracted the boom transport length
• main boom dual capacity length and limit switches
are all in the retracted positions
• the main boom transport angle switch is in the
transport position
• the tower lift is below elevation
• the drive orientation switch is indicating the turnta-
ble is between the rear tires
• the chassis is not tilted
• the Boom Sensors and tilt sensor calibrations have
been successfully completed
• the machine is in Ground Mode.
If the initial conditions are not met, the Control Sys-
tem will prompt the operator with analyzer mes-
sages to satisfy the initial conditions.
• “CHECK FAULTS”
• “AXLE VALVE FAULT”
• "OSC AXL SW FAULT”
• “PARK BRAKE FAULT”
• “EXTEND AXLES”
• “TOWER IN”
• "MAIN DOWN”
• “TOWER DOWN”
• “RETRACT MAIN”
• “ALIGN TURNTABLE”
• “LEVEL MACHINE”
• “CAL. BOOM”
• “SELECT GRND MODE”
3. The Control System will then prompt with the follow-
ing:
The control system will then suppress the “BCS VIO-
LATION – BOOM LOCKED” fault to allow the boom
to be taken out of transport position and disable all
hydraulic functions except Tower Lift Up and Down.
4. Once the Tower boom lifts such that the Tower Cylin-
der Angle sensor reads greater then 20 degrees,
Tower Lift up will be suspended and Main Lift up and
down will be enabled. The screen will read: