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Wendy MillerAug 1, 2025
What to do if the Skyjack SJ 3219 Boom Lifts function will not operate when the handle is moved?
- RrmcintoshAug 1, 2025
If the function won't operate when the handle is moved and the LEDs don't light, start by checking for voltage at the positive (+) input terminal and ensure the ground is connected to the negative (-) terminal. If there's an in-line fuse, inspect it. Also, check the controller on/off switch and connectors, ensuring voltage is present at the (X) terminal when the controller is on. Verify that valve wiring isn't shorted to ground, as this will prevent the LEDs from lighting. Finally, check the trimpot settings; a fully “CCW” turn shuts the output off, while “CW” turns it fully on.
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