JLG 4017RS Operator Manual - Manual (Page 131)

Section 7 - Lubrication and Maintenance
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7. Remove four thumb screws (1) and panel (2) from under dash.
8. Remove cab air filter (3) and inspect.
9. If filter is not damaged, clean and place back under dash. If damaged, replace filter.
10. Replace panel and secure with thumb screws.
OZ4020
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2
3