1999 Johnson 50 hp tilt and trim lowering while giving throttle

[jrtax]

As I was backing my boat in today I forgot i had the motor trimmed most of the way down and it bumped the concrete. Now when at about half throttle, the t&t slowly moves down. It has plenty of power when I raise the motor but as soon as I take my finger off the switch it starts moving down . Any suggestions what could be wrong. Thanks

[jrtax]

It also lowers when just sitting

[boobie]

First thing to do is check the oil level in it. Second is to check to make sure your manual release valve is tight.

[jrtax]

The fluid level is good. And manual release is tight. What would have happened when it hit the concrete?

[Will Bark]

Try running it up and down 5 or 6 times .

[jrtax]

I lowered it up and down 5-6 times. It didn't help. It makes a sputtering sound every once and a while. any ideas what could have happened when the motor hit the concrete. thank you for all your help.

[jrtax]

could it have blown a seal or something causing it to loose pressure. No fluiod is leaking out but it seems like its losing pressure.

[jrtax]

i drained all of the fluid so i could replace it. I raised the motor and locked it up. Filled to the bottom of the threads,put the cap in and now it will not raise the motor on its own. i tried raising it by hand a few times (helping the t&t) and the took the cap off to add fluid and it blew air out. So i added fluid and did the same thing and still nothing. I did this about 5 times and it still will not lift the motor on its own. Am i doing something wrong or does anyone have any ideas what i can do

[jrtax]

The problem was that the O-ring was broken on the end of the manual release valve. I replaced it and now it workks perfectly.