I have these actuators on a set of rocker tabs. I was told they come from a Cessna airplane. Never seeing ones like these on a boat before I tend to believe it.




The question is, what is this nipple for? The pin at the top is pressed in and the angles allow it to pivet so I don’t think it’s for grease.

Mark,,it looks like a greece zurt,,mabe it goes to the mounting bolt..

Bleeder valve...?

Thats what I'm afraid of. Is it for air to pressurize the cylinder like hydraulic steering has? Grease? Bleeding?
I'm leaning away from grease because the pin doesn't pivot at the cylinder. It's pressed in now but who knows if it could have moved before the cylinder made it's way to the boat. Figured an airplane guy would know. Don't want to squirt grease in it when it's an air bleeder or something like that.

Take the fitting out of the actuator with a open end wrench if its got greese behind it by god its a greese fitting. If its a bleeder there will be fluid of some sort probably red in color. I am about 95 percent sure its a greese fitting

+1 just painted

Cessna maybe, airplane no. Most likely tractor or large riding lawn mower part, from Cessna fluid power now owned by Eaton.

Likely bleeder nut. Just make sure piston is fully extended before you take it out.


Oh, and bleed in situ (attached).

Looks like a grease fitting.

Looks like a zerk fitting to me. I am sure it goes to the top of the cylinder to grease the piston.

a grease zerk remove it and you'll find grease behind there