JLG 860SJ Operator Manual - Manual (Page 60)

SECTION 3 - MACHINE CONTROLS AND INDICATORS
3-20 – JLG Lift – 3121630
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 verify that the drive control is being operated in
the proper direction (i.e. controls reversed situations).