bed lift bleeding?

[Rare1a1]

Gents,

Purchased a used bed lift assembly. Just set it up without attaching to bed. the rams don't lift synchronized so I assume I need to top off the hydraulic oil/ bleed. Can anyone tell be the procedure? I see the big screw down near the bottom of the assembly facing behind the gator as mounted and the small hex head about 2/3 the way up the pump. Assuming that's the fill point? I opened that screw and no oil in sight when the rams were retracted. Basically one extends up then the other starts when the first is fully extended. Sometimes they retracted evenly and sometimes they do not. Again, keep in mind haven't connected them to the bed yet so no load.
Also where do you mount the relays on the wire harness? Drill tap into the frame rail?

Thanks!

[Rare1a1]

bump! any details/ experience bleeding/filling these pumps?

[Rare1a1]

I should be all set - according to techs, this is common when the actuators have no load.