JLG 800A Operation And Safety Manual page 66

10. Overload Indicator (If equipped)
Indicates the platform has been overloaded.
11. Boom Malfunction Indicator
When an audible alarm sounds and the Boom Malfunction
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 Malfunction
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 PROB-
LEM TO THE PROPER SERVICE PERSONNEL. DO NOT OPERATE THE MACHINE UNTIL
THE CONDITION IS CORRECTED.
3121209
SECTION 3 - MACHINE CONTROLS AND INDICATORS
12. Drive Orientation Indicator
When the boom is swung beyond the rear drive tires or fur-
ther 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.
– JLG Lift – 3-21