Won't go!

[Caveman3250]

Hey any of you guys out there had your Yanmar FX32D just quit going in middle of working? By quit going I mean this: I was doing some grading on our property and was nearly done, no problems, all worked fine, then put transmission in 4th with rpms in medium range and let off of clutch, box blade was up, and it sounded like the engine just started to labor a few rpm then went back to normal....like I had put it in neutral. No response in either gear or shifting the hi/med/low as well. PTO still spins, 3 point still works, engine runs fine, just no power to wheels. BTW, it was in 4 wheel drive at the time. I have a bad feeling that something internal in transmission sheared or something like that! Where would you suggest I start, I have an exploded diagram of entire tractor but it's in Japanese... Thanks

Caveman
Eads TN

 

[winston1]

Assuming your tractor has differential lock, try engaging it and see if you have anything.

 

[HoyeTractor]

Yep try the diff lock and then there is also a powershift relief valve spring that has been known to fail on some FX models. It just dumps all of the powershift oil before it can build up enough pressure to engage the clutches. Symptoms are similar to what you are describing.

 

[284 International]

Since the PTO functions, it seems like the Powershift circuit is suspect. Somewhere here someone had several posts about, and I think a picture/chart of Powershift troubleshooting information. I would assume it was Winston, but do not recall.

 

[shawnjvl]

Here is the powershift trouble shooting guide. Don't know why I saved it since I have a YM2000

 

[Caveman3250]

Thanks guys for the responses. I will troubleshoot the flow chart that shawnjvl attached. Only problem, don't know where ports are to check pressures. Any idea? Is there a access plate or plug to attach gauge or is it a internal type of deal? I do have dif lock and tried this, nothing. Thanks for helping!!

Caveman

Eads TN

 

[winston1]

Here is a drawing of port locations and instructions on a YM226. Ref D on the drawing and you can see one plug on the back and one on the side. I have no idea whether your FX32 is the same or not. I would pay close attention to Aarons mention of the relief valve spring. You can see the ym226 relief valve in the same ref D. Only guessing the ST 1/8 threads mentioned might be British standard threads. Same as used on the oil pressure sending unit. Again, only guessing. Some have screwed in a 1/8" npt fitting at that point. Just one thread per inch difference. Should you be interested here is an adapter. http://www.hoyetractor.com/mm5/merc...re_Code=HTE&Product_Code=OGA-1&Category_Code= The more I look at the drawing it sure looks like a larger plug than 1/8?????

 

[careyo63]

The FX32 Has a internal Power Shift Pump and so does the 226. If the Relief valve spring isn't Broken and the Valve isn't stuck or sticking. I would be looking hard at the Internal Pump. Blown seal,O-ring or Gasket Or the Dr. Shaft to the Pump.. I couldn't find any pics. Of the pump itself but there has to a way to check the pressure out of it to the valves or Valve Body.

Ah now that makes sence Typo! I believe 22- 4 power shift lever is the Internal Pump. I would start there and make sure it has pressure or the pump is working.

 

[runningbird]

the relief valve spring is quick and easy to check....I would do it first.

 

[Caveman3250]

Will do the test this weekend I hope, temps have fallen below freezing this weekend so might have to wait till monday.

Thanks guys, I will post results when I get them....

Caveman
Eads TN

 

[murphy1244]

The way you guy's help each other is awesome, keep it up. :thumbsup:

 

[Caveman3250]

I checked what I think is relief valve spring, it was on side of transmission body held in by spring clip, pulled long piston out with heavy spring and smaller spring inside of it. Neither was broken. I looked into the transmission through the oil fill hole and could see fluid moving like it was being pumped through system but not sure which port I need to hook gauge to. The photos that were sent are too dark to tell details of which one to check. I will take photos and post them later today if I can. Maybe you guys can tell by looking....

Thanks

Caveman

 

[winston1]

Both ports are for checking. The rear side port is for checking transmission operating pressure. the front side plug is for checking transmission lubricating pressure.

 

[Caveman3250]

Here are the pictures I took. You can see the plugs, one set on left side, one set on right side. On the right side top, you will see the pressure valve I took out and checked, big round plug held in by snap ring. Pulled assembly out and all looked well, o-rings intact, springs not broke, nothing obvious. Am I even in the right area?

Thanks

Caveman

 

[winston1]

I think you are in the right area. Your fx series is definitely different than the ym series. Did you put a pressure gage on any of those ports just to see what happens? I have no idea about the ports on yours.

 

[grainger12002]

Caveman-Just a thought here but did you actually (physically)move the range shifter in and out as well as the difflock ? move all the shift levers completely,seems like a simple remedy should be in order....
Just a thought

 

[Caveman3250]

Grainger, yes I have moved all many times, was thinking just a linkage broke/slipped (hoped this anyhow!) but nothing happens. Winston, I haven't put gauge on it yet, just wanted to check first with those in the know but I will in next day or two.... I guess the solution will ultimately be to crack open the transmission case..... I guess best case would be to be able to repair by removing one of the cover plates.......we shall see!

Caveman

 

[Caveman3250]

Here is update of what I have found.... I was able to test the right side upper port right under pressure relief valve... When at idle, no pressure, when shifting it kinda fluctuates between 1 and 5 psi. Sounds like it's trying to do something but either the pump has failed or seals like you guys have said. I will attach the drawings from the manual I have....it's all in Japanese however the drawings are a real help when working on tractor.....only if I knew what the words said.
I do have question on the attached drawings, there appears to be 2 pumps on these pages, which one would be the suspect one. I put pages in order of drawing and their part numbers.

Thanks

Caveman

 

[winston1]

I don't see the pump in your drawings. If you go back to post #7 and look at ref #B that should be the location on your power shift pump. At least I think so.

Are you going to test the other port? I would check everything humanly possible in the cover area. Any other relief valves, etc that could be pulled and checked for spring breakage, clogged ports, etc. Pulling that power shift pump is going to be major. It would be a terrible feeling to pull it and find it wasn't the real problem. I know it is possible and has probably happened but I have never read of one of these power shift pumps failing. I have read of clogged ports, broken springs, stuck valves.

If, just if, a relief valve spring is broken, or relief valve stuck, it could loose pressure. Ok, I preached long enough, just doubtful the pump is the problem. Sure can't know.

 

[Caveman3250]

I have started to open up the tractor. The cover plate shows a clutch pack but no obvious mess ups there. So I drained the tractor and got the tractor cracked open but will wait until tomorrow to pull it all the way apart.... I have two more diagrams to attach that I thought I did the other day. I think the pump is in this diagram.....

Thanks

Caveman