New owner of a model on the 'Models to Avoid' list - Yanmar FX235D

[azeller22]

Thanks for explaining the relationship between the 3pt circuit and loader.

Do you know how I get the loader float function to work? The loader joystick detents in float but when I go to float with the loader a few feet off the ground, the loader does not freefall, it just stays there. (I do see one of the loader lines twitches like it sees a pressure spike when I pop it from neutral into float) If I set the bucket flat on the ground, then detent to float, then tilt the bucket down, the loader will raise up, but then the loader loses contact with the ground. The loader does not want it's weight on the ground when in float.

Is there a solution? I'm wondering if this was ever working or if the owner who installed the loader just decided he didn't care about the float working. A Koyker rep mentioned something about adding a power beyond sleeve for Yanmars to fix the loader/3pt association. I'm waiting for a rep to respond to my voicemail.

I did leave the bucket a few feet off the ground, turned the tractor off, disconnected the out hose then place the joystick in float and it free fell to the ground. Not sure if a bad o-ring in the valve control would cause the valve to work when the tractor is off and no hydraulic flow but mess up the float function when the tractor is on and fluid flowing.

Thanks for your assistance!

 

[winston1]

Guess I'll comment. I think the power beyond is probably what you need to take back pressure off your loader valve. Just a weak opinion, no fact.

 

[California]

I did leave the bucket a few feet off the ground, turned the tractor off, disconnected the out hose then place the joystick in float and it free fell to the ground.

I don't have a clear idea what's causing this but I see a possible clue in what you described above. In Float, the bucket should fall regardless of whether the engine is running or not. If it will fall only with the engine off, that suggests there is something downstream that blocks the fluid after it went past the loader control. (Backing up pressure that should have drained out of the loader lift circuit and onward toward the 3-point).

Could that UFO 'black box' control a blocking solenoid downstream from the loader valve? That, or some other cause for downstream blockage, might be the place to start looking for the problem.

The older ones have a big knob under the front of the seat that when closed, will keep the 3-point up forever. And also a small Drop Rate Valve under one side of the seat that meters how fast the the 3-point falls. If either of these valves is nearly closed it could cause the behavior you see. I have no idea if these same features are on a UFO-version hydraulic system. Possibly electronic circuits replace these manual controls.

Or just call for an exorcism.

 

[azeller22]

Mine has the knob under the seat you turn clockwise to slow/stop the lowering and counterclockwise to speed up the lowering. Messing with it doesnt do anything for my float issue. But, there is something in the UFO controls that also supposedly controls speed of something. I'll explore some more, and follow some of the UFO wiring, thx.

 

[clemsonfor]

That knob you describe is a service stop on the older YM tractors. Could be different on the new ones but the old that is to remain open unless you want to burn up or deadhead your pump. Unless your working on it then you can have it closed but the tractor is probably off of that's the case.

 

[azeller22]

Not much more to the tractor. There is a UFO solenoid that controls a directional control valve but it is basically plumbed in/next to the hyd valve that controls the lift arms. Every other wire goes into the UFO controller and comes from a rheostat sensor. The next thing to check is the orings and if nothing there, then replumb the system as Koyker directs with a 3rd line and power beyond sleeve.

 

[k0ua]

Keep in mind that a Japanese speaker you enlist to help you translate the controls will also have to have an understanding of the context of the words as it applies to the machinery. As an example ask any good English speaker what the words "Draft" and "Position control" mean. That you might find on 3pt controls on a tractor labeled in English. The English speaker might think "Draft" has something to do with beer and report it as such. He might think "Position Control" as practice from the Kama Sutra or something like that. Not to mention "1/4 inching".