JLG 4017PS Platforms Operator Manual - Manual (Page 27)

Section 2 - Pre-Operation and Inspection
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2.4 OPERATIONAL CHECK
After start-up from platform and when engine warms, perform an operational check:
1. Horn must be audible from platform.
2. All boom and platform functions operate smoothly and correctly.
3. Ensure all boom functions stop when function enable trigger is released.
4. Ensure all functions are disabled when power/emergency stop switch is
depressed.
5. Perform any additional checks described in Section 8.