Erratic Hydraulics

[Gary Sweat]

Thats got to be it. Either oil can't get into the pump fast enough, or there is a restrictor fitting. Like JJ said, look for a standard fitting with a 1/8" or smaller passage. A restrictor plate could be installed between what looks like 2 fittings. Ford use to put one way restrictor plates between 2 fittings on the hoses. The idea was a fast raise, slow drop, or fast curl, slow dump. A lot of times, these plates were installed backwards, that would cause a slow lift, fast drop, etc.

Restrictor fittings would slow the functions in both directions. A little piece of debris in the fitting would make them restrict even more.

Also, never rule out a QC as a restrictor. If they are mismatched, say a Parker w/a ball check plugged into an Aeroquip w/a poppet check, the QC's wont open all the way. And, damaged or worn QC's wont open all the way, either.

I have checked and cleaned the transmission filter screen. It is clean and no holes or obstructions in the screen. The transmission has been flushed out with 3 oil changes until it is running clean with no milky look or foaming.

There are no QD in the system. I built the loader and installed all of the hydraulics. There are no leaks in the lines or anywhere and it runs quiet and smooth. The 3pt still works as it always has and doesn't have any problems lifting either. I have also noticed the 3pt doesn't work any faster with rpm either. But then, I don't know the ins and outs of how the internal workings are in it so it may not matter with rpm.

 

[AKKAMAAN]

I have checked and cleaned the transmission filter screen. It is clean and no holes or obstructions in the screen. The transmission has been flushed out with 3 oil changes until it is running clean with no milky look or foaming.

There are no QD in the system. I built the loader and installed all of the hydraulics. There are no leaks in the lines or anywhere and it runs quiet and smooth. The 3pt still works as it always has and doesn't have any problems lifting either. I have also noticed the 3pt doesn't work any faster with rpm either. But then, I don't know the ins and outs of how the internal workings are in it so it may not matter with rpm.

Your problem sounds like it is caused by a mis-plumbed priority valve in your system....sending priority flow to your 3pt and FEL, and exhaust flow to power steering?? LOL

 

[Jbrink64]

Your problem sounds like it is caused by a mis-plumbed priority valve in your system....sending priority flow to your 3pt and FEL, and exhaust flow to power steering?? LOL

That would be a new one...alway possible.

 

[Gary Sweat]

Your problem sounds like it is caused by a mis-plumbed priority valve in your system....sending priority flow to your 3pt and FEL, and exhaust flow to power steering?? LOL

That could be it except I don't have power steering or a priority valve.:laughing: Maybe I just have situation that I am stuck with.

Does anyone know if the bigger Yanmars (2210 and up) have a larger volume pump that I could interchange with mine. That is if I could locate one

 

[mmurphy]

Maybe at max flow through your valve, so revving up causes valve to restrict extra flow? You would be dumping extra through relief.

 

[AKKAMAAN]

Maybe at max flow through your valve, so revving up causes valve to restrict extra flow? You would be dumping extra through relief.

well, it is a 10gpm valve getting 4gpm flow, so it shouldn't resist flow that much....I think the PRV might be stuck open a little....debris?? or CV still not allowed to 100% fully close "center" to tank....

 

[Gary Sweat]

well, it is a 10gpm valve getting 4gpm flow, so it shouldn't resist flow that much....I think the PRV might be stuck open a little....debris?? or CV still not allowed to 100% fully close "center" to tank....

Not sure how I could tell that. The gauge goes back to zero when the CV returns back to the center when using the loader. If the PRV was not fully closed would the gauge show any pressure or would I hear some noise from it?

I do see when the 3pt creeps down that the gauge will start showing pressure and I hear something start relieving but I don't know if it is the 3pt or the PRV in the CV making the noise. lf I back off the 3pt handle a little then it goes back to zero and I don't hear the noise.

 

[RickB]

This is where a flow meter would tell you exactly what is going on. A pressure gauge only gets you so far, and you have been to that point for a while now.

 

[Gary Sweat]

This is where a flow meter would tell you exactly what is going on. A pressure gauge only gets you so far, and you have been to that point for a while now.

So, would the flow meter go in the tank port return line? Where would it give me the answer I'm looking for?

 

[RickB]

Ideally it would go between the pump and main relief valve. From a practical standpoint it would probably be easier to install it before the inlet to the loader control valve. No matter where it is installed, you just need to consider which components are isolated by the test and which are not.