4 post car lift issue- squealing

[Happytech]

I have a perfect park 4 post lift that i am having issues with
It squeals going up/down. I have greased the columns and added cat anti chatter juice. When testing today hydraulic fluid started leaking out of what i believe is a brass valve to empty. The valve is not screwed all the way in. So i have two issue and trying to determine if it is the cylinder that is bad. I have attached a photo of the brass valve and as shown in pic it is not completely secured in cyclinder and not sure if it is supposed to be
Thanks

 

[rburke65]

Is there a line connected to that brass fitting? or is that just a solid plug? Tighten it.

 

[Awag]

I can't tell from that pick but if thats a two way cylinder and they are only using one port on it and your getting fluid out of that plug you have an internal leak on your cylinder. Is it a plug or a filter? I wouldn't think you'd want it plugged off solid.

 

[nadogail]

IMHO, that blocked port should have a vent installed.