I have replace my hydraulic rams end caps and Orings twice and still notice water in my trim pump oil. There is no oil leak from the rams so where is the water coming in from. I have had this problem for a while.

Since you seem sure that it isn't getting in at the seals...

Any chance that rain water drips between a hatch edge near the transom and drops onto the top of the pump or reservoir?

I had that once. It stopped when I put a bucket over the top.

Check the hoses, that's where mine was.

If the water is coming in from the hoses would oil be coming out from it.

Thanks Ailina

There is no water leaking in the engine room where the trim pump is mounted.

Thanks Ailina

Maybe Cuda is on to something then?