Ram drives not holding

[jbauman102]

I have a dp-sm and it doesn't hold when I trim up while cruising. It holds when I'm not cruising. I've replaced the diaphragm below the pump and rebuilt the rams. There are no leaks also. Any suggestions?

 

[Scott Danforth]

You either have leaking cylinder piston seals or a load holding check valve in the pump is not sealing

 

[jbauman102]

Would replacing the seals on the rams fix the leaking cylinders because I already did that.

 

[Scott Danforth]

did you inspect the bores when you pulled the pistons?

quick test, trim up all the way, then pull the rod end hoses. hit trim up some more. if oil comes out the rod end hoses, you have leaking piston seal