Creepy loader

[careyo63]

I lifted the 3 point with the box blade then shut the tractor off. It took 10 minutes for it to drop to the ground. Pretty sure I can live with this.

Mines the same. Which I can live with. If you absolutely don't want the 3pt to fall use the lock between your legs. Then all you have to remember is open it before you go to lift the 3pt.. Lowering is no problem, It's locked and not going to happen but lifting will cause a dead head and your going to hear it!!
When it has sat for awhile and does fall that's no big deal to me either since when I start it back up it raises back to were I left the handle. Your Good then. Not enough Hyd. pressure to effect the starter. Until the motor starts and then the pump has to build up it's pressure.
As far as the loader can't help much on it. But have a opinion it just maybe in the controls.

 

[clemsonfor]

I had a missed spelling . I said Home, that was an auto correct of Hoye as in Hoye tractor. I since corrected my post.

 

[LD1]

Two things to try....

First.....Do just what you did with the loader in float and 3PH in the air but with the tractor OFF. Does the loader still creep up?

Second......do it with the 3PH up, tractor running, just like you did in the video...but WITHOUT the box blade

 

[duanew1]

I have been trying to think about why this is happening.

Is it possible that putting the loader in float causes the the loader cylinders to be connected to power beyond port (could be called something else) and the weight of the 3 point causes a back feed of pressure to the loader valve. This is because of the creep of the 3 point asking for more pressure and the valve opens going the opposite direction.

Just a thought.

 

[California]

I have been trying to think about why this is happening.

Is it possible that putting the loader in float causes the the loader cylinders to be connected to power beyond port (could be called something else) and the weight of the 3 point causes a back feed of pressure to the loader valve. This is because of the creep of the 3 point asking for more pressure and the valve opens going the opposite direction.

Just a thought.

Yes, that sounds right. I haven't figured out if it is that exactly (I don't have PowerBeyond). But the characteristics, and what I see on the pressure gauge I have at the loader valve input, matches what you described. If the gauge is inching up to/past 500 psi, the loader will be rising if it is in float position and I have hydraulic pressure keeping the implement up. I think this pressure rise is due to the feedback rod opening the 3-point rise valve, rather than back pressure.

I suppose it's obvious I don't understand this very well.

 

[winston1]

I think California has pretty much nailed it. Loaders are designed to operate with 0 backpressure. With a heavy implement on the rear and the feedback rod moving the valve to the lift position it therefore puts backpressure all the way back to the pump. I do believe the loader valve has to be somewhat worn to allow the loader to rise. With a slow valve leak the back pressure is going to slowly go to the place of least resistance. That being in the lift cylinders or could be curl cylinders, or whatever has a slow leak. Not good with words.

 

[duanew1]

I think California has pretty much nailed it.

Yea :confused3:

 

[California]

With a heavy implement on the rear and the feedback rod moving the valve to the lift position it therefore puts backpressure all the way back to the pump. I do believe the loader valve has to be somewhat worn to allow the loader to rise. With a slow valve leak the back pressure is going to slowly go to the place of least resistance. That being in the lift cylinders or could be curl cylinders, or whatever has a slow leak.

I think we're inching closer to understanding this, but a couple of comments: I think the lift cylinders receive all of the unwanted fluid because in Float position, fluid is free to enter/depart them. Also, I replaced my loader control a couple of years ago because the original one dribbled on my foot. I don't know that the old one leaked down, however. This rising of the loader in Float is unchanged with the new control compared to the old one.

Maybe the fluid getting past a control valve is at the 3-point lift valve rather than the loader control.

I wish I better understood how the loader control in series ahead of the 3-point actually works.

 

[Rail9222]

I am convinced that the problem is in the 3 point. It could be a couple things including a leaky relief valve.
The circuit shows the 3 point valve as a 3 position so it has a neutral. This part could be leaky as well.








I think I may take the valve apart and see if there is anything obvious.

 

[clemsonfor]

All those 3 points leak with age. The shaft in the valve is just a machine fit. As it wears fluid can slip past and "leak" internally. When the machine is on it just adds the ting bit of fluid so you never see you implement drop, but when tractor is shut off that's when you will see it slowly fall down.

I have had mine apart a few times. There are no spare parts to be had for them other than parts tractors and there is no seviceable/wear parts on the inside of them either.