Power trim will not stay sags

[josmos23]

"I have an 1987 Chris Craft 21

"I have an 1987 Chris Craft 21' Seahawk with an 88 Evinrude 200 hp. The power trim and tilt seem to work fine except that when on the trailer, when left in 3/4 full tilt, it slowly (over a day or two) will lower itself almost all the way down. Any ideas?"

 

[makomark]

Hydraulic leak in the ram or

Hydraulic leak in the ram or there's air in it and it needs to be bled.

may get a faster response posting in the evinrude outboard section.