JLG 4017 Operator Manual - Manual (Page 48)

Section 2 - Pre-Operation and Controls
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Load Moment Indicator (LMI)
The Load Moment Indicator (1) provides a visual indication for forward stability
limitations.
• All five LEDs (2) will light (three green, yellow & red) and the warning buzzer
sounds as the telehandler reaches its forward stability limitations.
• When the red LED is illuminated the automatic overload protection function is
activated. Boom extension, boom lower and outrigger functions are disabled.
• Test the Load Moment Indicator (3) at the beginning of each work shift. See
Section 7 - Additional Checks.