Leaking trans/hyd oil

[roxynoodle]

I have been using my FEL this morning for about 3 hours and now there is transmission/hydraulic oil leaking from the top of the reservoir. My first instinct is to think that it was overfilled. My second thought is that the cap could be bad? Any ideas? I think this is the most I've used my loader nonstop, which could be why I haven't seen it leak before if it was overfilled. Any and all suggestions will be appreciated.

 

[John47]

I have been using my FEL this morning for about 3 hours and now there is transmission/hydraulic oil leaking from the top of the reservoir. My first instinct is to think that it was overfilled. My second thought is that the cap could be bad? Any ideas? I think this is the most I've used my loader nonstop, which could be why I haven't seen it leak before if it was overfilled. Any and all suggestions will be appreciated.

Have you checked the level Roxy?? Might also be a failed "o" ring on the filler plug!

 

[roxynoodle]

My level is reading a little low now, but that isn't surprising since I lost fluid today. The leak is coming out from under the reservoir cap. The cap is plastic and does not have an O-ring. Should it? If so, that is my problem.

 

[John47]

My level is reading a little low now, but that isn't surprising since I lost fluid today. The leak is coming out from under the reservoir cap. The cap is plastic and does not have an O-ring. Should it? If so, that is my problem.

Not knowing what or where your filler is I'm not sure.
Mine is a combined dipstick and screw in plastic filler cap. There is an "O" ring on it.
I would imagine yours would be similar and if the oils starts frothing and gets hot, without the "O" ring, it would seep out.

 

[normde2001]

Check/clean the vent, ( upside-down "J" shaped tube on top of your 3ph module, under the seat). It just unscrews.

 

[roxynoodle]

Thanks, Norm, I will check that.

The dipstick is seperate from the reservoir cap. The reservoir cap is behind the seat and the dipstick is on the left side under the seat. The dipstick has an o-ring on it. The tractor is a 1510D. Does anyone know if the reservoir cap should have some kind of gasket on it?

 

[Normmm]

On every cap I have seen on a Yanmar that used a gasket ther is a grouve cut into it to recieve the O ring. Do you have Jd303 equiv. fluid in the trans sounds like foaming fluid. Either wrong type of fluid or maybe air leak on the suction side of the pump.

 

[roxynoodle]

Ok, we spent 3 hours on this trying to figure out what is going on. The fluid comes out the little hole at the top of the reservoir cap only when the loader is being used. We took apart the black thing on the left side that seemed to be a vent and it was not clogged. The cap seems to have a groove for an o-ring but there is no o-ring. The fluid is actually slightly overfull, but just a tad. Our thoughts now are 1. I need a new cap or maybe just an o-ring. 2. could the transmission filter be clogged?

It seems like the fluid is not going down into the reservoir fast enough? It blows out of the cap pretty fast.

How would we check for an air leak?

It does have the right kind of fluid in it.

 

[roxynoodle]

When I did a search about this problem, one person said he had this problem because a 1/4" U-shaped thing was clogged. I do not see anything that looks like that. I also don't see the upside-down J-shaped valve Norm mentioned. Here is a picture of the back of my tractor.


There is also some kind of screen that looks from the paint that it has never been cleaned or replaced.


Could this dirty screen be my problem?

 

[YanmarFever]

Rox, I think you are on the right track with the filter screen being clogged.
When you pop the side cover off be EXTREMELY careful not to break the tabs on it. It is made from aluminum, and they break just by looking at them.
Dont ask how I know.

clean your filter & replace the fluid & hopefully thats a cure.

We have 3 1510s here for parts if you need anything

Ernie

 

[roxynoodle]

Two dealers both think it might have something to do with how the loader is plumbed. If that is the case, I'm not sure what I can do about that. I am going to drain the fluid, clean the screen, refill and possibly try a new cap. If that doesn't work I am not sure what to do next. I don't know anything about how the loader should be plumbed. I have no manual for it nor even a brand name, it is also Japanese. I don't know if anyone around here would work on it.

If anyone else still has ideas, let them fly!

 

[LMTC]

Two dealers both think it might have something to do with how the loader is plumbed. If that is the case, I'm not sure what I can do about that. I am going to drain the fluid, clean the screen, refill and possibly try a new cap. If that doesn't work I am not sure what to do next. I don't know anything about how the loader should be plumbed. I have no manual for it nor even a brand name, it is also Japanese. I don't know if anyone around here would work on it.

If anyone else still has ideas, let them fly!

If it blows fluid out when activating the loader control(s) it has nothing to do with the cap in my opinion. Somehow the reservoir is being pressurized when you use the loader. The japanese loader plumbing we have seen is several levels beyond obtuse. If part of the loader system has failed, you need a hydraulic specialist. It is not homeowner stuff.

 

[roxynoodle]

Got a new cap for the hydraulic oil. Tonight I am going to drain the fluid, clean the screen, fill with new JD 303, put on new cap and hope for the best. One other thing I will do is make sure the tubes leading to the vent are not blocked (think I only checked the vent itself last week). If it requires more than this to repair the family that farms behind me owns a dealership (not Yanmar), and they said they have worked on Yanmars and would be willing to repair it. So I am glad to have a mechanic close by who can do things that I may not be able to.

 

[roxynoodle]

Well, I know what the problems is, I just don't know how to solve it! When the loader comes down it sends the hydraulic oil back and there is nowhere else for the air to go but out the vent hole in the cap. If I provide another way for the air to escape, like by taking out the dipstick, then the oil doesn't come through the cap. I took what I thought were the vent hoses (the ones that go into the black cylinder in the pic) and made sure they were clean along with the itty bitty tubes they connect to on the rear diff. Those hoses seem to vent something else like maybe the rear hubs? I have to be missing something else. This system has to have somewhere else to vent other than the cap.

By the way the screen wasn't that dirty.

What am I missing? Does anybody know? I don't have that U-shaped tube.

 

[roxynoodle]

The problem is that a restrictor is missing in one of the valves, which allows the fluid to return too fast, making pressure. Turns out this same company makes the loaders on JD (surprise, surprise) so I can probably come up with this thing pretty easily. Just making some small adjustments on the joystick has helped already. I think I now know more about hydraulics than I ever thought I would!