JLG 642 Operation & Safety Manual page 31

8. Operational Check—Once the walk-around inspection is complete, perform a
warm-up and operational check (see page 2-14) of all systems in an area free of
overhead and ground level obstructions. See Section 3—Controls and Indicators for
more specific operating instructions.
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.
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Section 2—Pre-Operation and Inspection
WARNING
2-3