Alpha1 gen2 won't go down without cracking open hydro line

[ECVCHAMP]

My buddy has a 99 Maxum 170 with a 280hp Mercruiser Alpha1 gen2. When we put the drive all the way up with the trailer button it gets stuck there and will not go down. to make it go down we cracked open the line on the end of the cylinder closest to the transom on both and then it will go down, If we bring it up about an inch short of all the way up it will go down just fine. I checked the trim limiting switch as the book recomended and the distance of the rams as it said to.

 

[Bondo]

Re: Alpha1 gen2 won't go down without cracking open hydro line

Ayuh,... It shouldn't be stored ALL the way up anyways,...
If you run it Up, then tap it back down abit,... Does it still hang up,..??
If so, it's probably the check-valve inside the pump protesting it's abuse...

 

[ECVCHAMP]

Re: Alpha1 gen2 won't go down without cracking open hydro line

Ayuh,... It shouldn't be stored ALL the way up anyways,...
If you run it Up, then tap it back down abit,... Does it still hang up,..??
If so, it's probably the check-valve inside the pump protesting it's abuse...

Yes, if you run it all the way up it will not come back down without opening the line and thanks for the advise on storage. I told him when he got it not to store it all the way up, not sure what the po did he just purchased this boat last season. So he only has it all the way up when trailering as I also do on my boat.

 

[ECVCHAMP]

Re: Alpha1 gen2 won't go down without cracking open hydro line

Also, the check valve was kinda what I was thinking, but not sure. I'm trying to not just throw parts at it. He is looking into a new pump. Thanks

 

[basstracker219]

Re: Alpha1 gen2 won't go down without cracking open hydro line

i think its an abused check valve.

 

[ECVCHAMP]

Re: Alpha1 gen2 won't go down without cracking open hydro line

Looks like he got lucky. took it apart and cleaned everything, replaced the power steering fluid with the proper oil and it looks like she is working fine. Thanks for the help.