Happened again - Yami T9.9XPA

[Brian D]

A couple of years ago I had an issue with this motor. The Tilt and Trim function didn't work. There were no other issues with the motor or the electrical system, it is just the motor would not go down when pressing the down button. I asked the boat bottom cleaners if they would take a look and the next time I went to the boat the motor Tilt and Trim worked. Not sure what they did but I think it had to do with a pressure release valve screw on the side of the hydraulic pump.

Well I have been very busy lately and haven't had a chance to get to the boat. But when I did, I find, again, the Tilt and Trim is not working. I have been trying to unlock the pressure release screw to see if I can fix it, but I cannot get the screw to move more than 1/4 turn CCW. According to videos regarding releasing the pressure so the motor will go down (or up depending the current position) the screw should get maybe 2 full turns. I have even tried using an impact tool, but I don't think I am getting enough umph to move the screw. I am practically upside down trying to use the tool. I do plan on either moving the boat in the slip so I can get to it from the dock, or using my dinghy.

Now, for your expertise. Is there another way to release the pressure inside the cylinder? Maybe by opening the port to fill the reservoir? Do you think that might work (if I can get it open). Also, there seems to be a bit of dirt on the dirt seal of the cylinder rod. I might use either some oil or PB Blaster or Liquid Wrench on that part.

Thoughts, especially if you have a Yami Outboard with Tilt and Trim and have used the pressure release screw.

Thanks in advance.

 

[JamesG161]

The issue is caused by their safety design to NOT let the Motor drop unexpectedly.

The same thing is true for Hydraulic back hoes, Cranes , etc.
The normal repairs are made on Hydraulics when they are in their "relaxed" mode, or no pressure needed.

Then they release a hydraulic hose or other spot, catching the fluid.
Power brakes on an Auto, uses Brake Fluid in a similar method.

Sounds like a call to the Manufacturer to find out "tip and tricks".

Sorry I could not help in a more direct method.
Jim...

 

[Brian D]

That's OK Jim, I understand the safety part. There have been complaints that the release screw is not easy to use and it's location is in a dangerous spot. Like I said, in order for me to access it (if not in the water) is by literally hanging over the transom upside down. Now that is not safe at all.

 

[JamesG161]

Ok how do you fix the Hydraulic lift?
Draining the fluid is the easy part, so to speak.

Power for the pump comes from the Battery.

I would start with electrical, before Hydraulics.

Remember your Walmart Battery issue and post?

Step by step tracing.
I am not trying to pushy.
Jim...

 

[Brian D]

Batteries are brand new, two in parallel, and work just fine. The old batteries were lagging and quickly died as I pressed the button. So I can confirm that electrical is not an issue.

I am 95% sure it is the hydraulic pump issue. If I can release the pressure (which might really be air within the cylinder) the motor will go up and down. Just wondering if loosening or removing the cylinder plug (fill port) will do the same thing like the pressure release screw. Probably the only way to find out is to try it next time I am at the boat. My thinking is if the air is released then the cylinder should move the rod. Should being the operative word.

Think I will move this thread to the motor forum.

 

[Brian D]

Well, it has been solved. I was only able to get the relief valve open by a total of about 1/3 to 1/2 turn. But eventually the motor started to move in the down position by gravity. I eventually coaxed it all the way down by applying a little pressure with my foot while using the down button. Now the motor moves up and down without any issues.

 

[kappykaplan]

Good news!

 

[jssailem]

When struggling with an mechanical problem... Get a bigger hammer... or in this case a Marine's Foot.

Problem solved.