JLG 4017RS Operator Manual - Manual (Page 57)

Section 3 - Controls and Indicators
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13. Frame Level Switch: Controls the left to right frame level. Depress right side of switch
to rotate frame right; depress left side of switch to rotate frame left. Frame level
operable with boom below 20 degrees or with boom fully retracted and between 20
and 55 degrees.
Climate Controls
14. Air Conditioning Switch: On/Off switch.
15. Fan Speed Switch: Adjustable rotary switch.
16. Temperature Control: Adjustable lever.