JLG 4017RS Operator Manual - Manual (Page 39)

Section 3 - Controls and Indicators
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11. Accessory Control Lever: See page 3-22.
12. Joystick: See page 3-14.
13. LSI Indicator: See page 3-10.
14. Frame Level Indicator: Enables operator to determine the left to right level condition
of the telehandler.