JLG 1500SJ Operation And Safety Manual page 153

AXLES EXTENDED
When the axles are extended for the first time (meaning previous
state is retracted and current state is extended), regardless of the
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SECTION 5 - LCD DISPLAY PANEL - GENERATION 1 & 2
Engine state, the Axles Extended image will show up on the
machine status tray for first 3 seconds.
Figure 5-38. Axles Extended Screen
– JLG Lift – 5-53