When it does it, you can feel it in the motor. It doesn't do it all the time. It also doesn't bleed down. I have left it up all the way and in the morning she's still up all the way.
I see. This is with the assumption you used the correct type of fluid and that you did not overfill it. You can actually overfill the system if you try to top off the fluid while the tilt and trim are in a out position. Make sure when you top off the system, both tilt and trim rams are in full down position. To bleed the system just remove the fill valve and cycle the system to its full out and all the way back down a couple of times.
The service manual called for ATF. My other Force/Chryslers used a 30 WT. non detergent motor oil. This outboard uses the Mercury tilt. On the fill cap it states that the system is under pressure when all the way down and to fill it, the outboard should be all the way up?
So your best recourse for now is to remove the fill plug and then lower the tilt and trim all the way down. Standby for excess fluid from the fill hole. Then you can replace the fill plug and hopefully this will fix the problem.
I didn't take the motor itself apart but I put power to it and found that the brushes are worn. It will run and then start to jerk. I would say that the bushings/bearings are also bad. There is a Generator Exchange shop in town that rebuild small electrical motors, I drop it off to them.
