Bleeding trim system: Help

[billmac]

So I got a new trim motor / pump in my '88 Mercury I6. Is there a handy process for bleeding out the air? It moves up, shakily, but not really down. I have repeatedly opened the fill tube and topped up the fluid, so maybe that's all I need. But it appears to be a slow process. If you saw my other posts you know that my manual release valve is frozen, so I can't use that as part of the process. Thanks.

[Deephaven]

Just did my jack plate pump which is a trim pump and you have to raise it, fill, raise it, fill, raise it, fill until you get to the top and then it worked.