JLG 740AJ Operator Manual - Manual (Page 61)

SECTION 3 - MACHINE CONTROLS AND INDICATORS
3121295 – JLG Lift – 3-21
11. Boom Malfunction Indicator
When an audible alarm sounds and the Boom Malfunc-
tion Indicator illuminates when attempting to activate a
tower boom function, the function is being cutout by
tower boom limit switch. This function is not permitted at
the current boom configuration.
When an audible alarm sounds and the Boom Malfunc-
tion Indicator illuminates steady without a boom function
attempt, the upright is out of alignment.
DISCONTINUE OPERATION IF THE UPRIGHT IS OUT OF ALIGNMENT OR
THE BOOM MALFUNCTION LIGHT REMAINS ILLUMINATED.
IF THE UPRIGHT IS OUT OF ALIGNMENT WITH THE PLATFORM RAISED,
LOWER THE MAIN BOOM AND TELESCOPE OUT UNTIL THE PLATFORM
REACHES THE GROUND. THE TOWER BOOM DOWN FUNCTION IS CUT
OUT IN THIS CONDITION. REPORT THE PROBLEM TO THE PROPER SER-
VICE PERSONNEL. DO NOT OPERATE THE MACHINE UNTIL THE CONDI-
TION IS CORRECTED.
12. Drive Orientation Indicator
When the boom is swung beyond the rear drive tires or
further in either direction, the Drive Orientation indicator
will illuminate when the drive function is selected. This is
a signal for the operator to activate the Drive Orientation
Override Switch and verify the drive control direction is
correct.