JLG 4017RS Operator Manual - Manual (Page 26)

Section 2 - Pre-Operation and Inspection
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8. Operational Check - Once the walk-around inspection is complete, perform a warm-
up and operational check (see page 2-8) of all systems in an area free of overhead
and ground level obstructions. See Section 3 - Controls and Indicators for more
specific operating instructions.
WARNING
If telehandler does not operate properly, immediately bring machine to a stop, lower
boom and attachment to ground and stop the engine. Determine cause and correct
before continued use.