How do you engage outriggers on this?

[bigamericandream]

 

[moondoggie]

Lever?

 

[mauldinoutdoor]

Last old utility truck I worked on had turn handle gate valves on the turret to control each outrigger then a hand lever to actuate them. Open the valves for the outriggers you wanted to move then move the lever to set them. Had 4 valves. Hope it helps