hyd control valve on 3 pt

[kenmac]

I have no doubt it's clean. You are guessing it's dirty

If I wanted JD303 in it, I would have put JD303 back in when I changes it last yr.

 

[careyo63]

Well if you want it to work correctly you might want to use JD303 or equivalent........ That just maybe the problem. Something Changed and that is no doubt it was that.....

 

[Neat 1500]

I'm not joining the bandwagon but..... I think it could also be something to do with the trans fluid in it. The pump may be a bit lazy and a few other bit worn which is amplifying your problem. As it warms it does turn to water, I notice this with my YM14 trans. Great when it's cold but a bit ordinary when hot.

 

[winston1]

Kenmac, the relief valve is shown in the very bottom parts drawing in that link from post #20 with reference numbers 27 through 38.

 

[rScotty]

Kenmac, the relief valve is shown in the very bottom parts drawing in that link from post #20 with reference numbers 27 through 38.

Winston, I just went to that link and read through the article above that illustration. There is at least one striking inaccuracies in the text of the article which could lead a person down the wrong path entirely, and that makes me wonder just how universal that illustration is. Do we know what model Yanmar is being referenced in post #20?

Looking back on the original post #1 on this thread....if it were my tractor doing that I would go back and get some more information and do some diagnostics. Kenmac says the loader is slow. Well, that could have several causes. Along that line, does anyone know how similar - or not - the gray market YM3110 is to the US YM336? I ask that because I am more familiar with the YM336. It's has a type of standard factory power steering and a proportioning valve which made its hydraulics work a bit different from the under 30 hp YM series.
rScotty

 

[kenmac]

I'm not joining the bandwagon but..... I think it could also be something to do with the trans fluid in it. The pump may be a bit lazy and a few other bit worn which is amplifying your problem. As it warms it does turn to water, I notice this with my YM14 trans. Great when it's cold but a bit ordinary when hot.

Yes, I believe as it gets hot, The fluid thins out too much causing everything to slow down.
At first, I thought it may be something to do with the 3pt control valve. After using the tractor first thing in the mornings, I really noticed how well the loader works until it gets hot.

It did the same thing with the JD303, which is why I switched to transmission fluid.
I believe tractor Ernie used transmission fluid in all his yanmars and never reported any problems.

 

[winston1]

rScotty, I don't know what model the illustrated tractor is. Yes, Kenmac does have power steering. I too, as Carey pointed out, had a 2002D with the factory power steering and factory diverter (proportioning valve). Never experienced the problems Kenmac is having.

 

[kenmac]

Winston, I just went to that link and read through the article above that illustration. There is at least one striking inaccuracies in the text of the article which could lead a person down the wrong path entirely, and that makes me wonder just how universal that illustration is. Do we know what model Yanmar is being referenced in post #20?

Looking back on the original post #1 on this thread....if it were my tractor doing that I would go back and get some more information and do some diagnostics. Kenmac says the loader is slow. Well, that could have several causes. Along that line, does anyone know how similar - or not - the gray market YM3110 is to the US YM336? I ask that because I am more familiar with the YM336. It's has a type of standard factory power steering and a proportioning valve which made its hydraulics work a bit different from the under 30 hp YM series.
rScotty

The 3110 also has this valve. The manual states that ps has priority . After checking , I think my loader problem is related to the fluid getting hot and thinning out causing the pump not to flow as well

I have transmission fluid in it now, but it did the same thing with JD303 fluid.

I did add some STP to the fluid to see if it would help the fluid stay thicker when hot, and yesterday when I used the tractor all day, It seemed to really help !

 

[winston1]

I'm sure thinning fluid could cause some slower response but I think you have other issues. When I used my 2002D all day I could not tell any difference in the speed and it did get hot. Still thinking you have something leaking by or a badly worn pump.

 

[rScotty]

The 3110 also has this valve. The manual states that ps has priority . After checking , I think my loader problem is related to the fluid getting hot and thinning out causing the pump not to flow as well

I have transmission fluid in it now, but it did the same thing with JD303 fluid.

I did add some STP to the fluid to see if it would help the fluid stay thicker when hot, and yesterday when I used the tractor all day, It seemed to really help !

Maybe...... Are you thinking that you may have two entirely separate problems? Even if the pump itself is worn, I don't see how the 3 point dropping would be connected to the pump. That's more likely to be a leaky valve somewhere in the system. On the other hand, a leaky valve would certainly make the pump appear weak.

It sounds to me like you are going to replace that relief valve in the 3pt anyway. I agree that would be a good place to start, and might even be the whole problem. Based on what's been written, I'd do that in any case.

There's a lot of trans/hydraulic fluids on the market. Frankly I've not found much difference in any of the name brand trans/hydraulic fluids. That may be because our little tractors just don't really stress a modern trans/hydraulic oil. JD makes a low vis 303, but I've not heard of a high vis 303. A pump would have to be really, really WORN before you will see a difference based on viscosity. And if it was that worn I'd think that you would also see quite a difference in loader speed depending on how much load you are lifting. Do you see that? Not just empty vs clear full, but depending on how full.

Just thinking out loud now.....Lots of oil companies market a JD 303 "lookalike"oil. No idea if they really are the same or not, and no idea how to tell.

Most Yamars had multiple hydraulic filters. Typical setup was for one to be a spin-on high pressure filter, and the other was a hand-cleanable tubular stainless screen down lower. I change the spin-on every 5 years or so when I remember to, but have never seen that make a difference. I have seen the hand-cleanable screen filter clogged up so much with some sort of dirt and oily film that it restricted flow. But that was in Yanmars with a power shift tranny and there the main symptom was slow engagement when power shifting gears.
luck,
rScotty