JLG 266 LoPro Operator Manual - Manual (Page 57)

Section 3 - Controls And Indicators
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3.4 OPERATOR SEAT
Adjustments
Mechanical Suspension
Prior to starting the engine adjust seat for position and comfort as follows:
Suspension
Use the knob (1) to adjust the suspension to the appropriate weight setting.
Backrest
Use knob (2) to adjust backrest angle.
Seat Belt
Always fasten seat belt (3) during operation.
Fore/Aft
Use the handle (4) to move seat fore and aft.
Seat Cushion
Use latch (5) to adjust cushion angle.