YM2020D - 3 Pt just stopped working.

[Scotty Dive]

I am posting this to see if the experts here have any ideas on where to look first. I normally would jump right into this and not ask questions until I got in over my head but my tractor is outside and the weather is just down right cold and getting colder so if I can save some troubleshooting time it would be ideal.

So, clearing the snow we received last night and since no good deed goes without punishment, I was assisting two other neighbors with removing their snow drifts, and my 3pt just stopped working and I could not use the back blade. Loader and power steering (Hoye Kit) are all working fine. It just stopped lifting and dropped to the ground. Of course I was able to lift it up manually. The first thing I will check for is if there is some linkage problem, but I spoke to the good folks at Hoye who believe it could have been a failed ORing. That will be the next item, but that seems to be a challenge since it will take the whole tractor out of service until parts are available and put back in. Its been about 50 hours (a year or so ago) since I last changed the hydraulic fluid, filter and cleaned the screen.


Hoye thought it could be o ring 22 under the knob (13)


Any other theories or things to test / check?

 

[careyo63]

I would stick with Hoye. And Might be the Pump Shaft Key....:2cents:

 

[winston1]

I would wonder if something back in the 3 point area could have frozen. Loader working should eliminate the pump key.

 

[careyo63]

I thought he said he could lift it and then it dropped to the ground? The loader. That is why I said the key. So yup! rule that out........

 

[Scotty Dive]

Shaft key should be fine since all other hydraulics are working. I thought about the freezing temperatures locking something up back there, but I had been working the tractor for 30 minutes or more so the Hydraulic oil should have been warm enough not to freeze at that point...at least that's my theory. Will try to get on it tomorrow......but temps are dropping fast around here...

 

[kenmac]

I don't have anything else to add except, it may be time for a back up tractor.
Maybe you can use your bucket until it warms up
High here today was 36. 36 would probably be considered a heat wave where you are

If I'm looking at it right,That O ring doesn't look to be a difficult job. Might find something that will fit in an O ring assortment

 

[California]

That O ring doesn't look to be a difficult job. Might find something that will fit in an O ring assortment

I think that's an application where the identical o-ring is needed.

I found the 'strainer' (wire mesh hydraulic filter) cemented in solid in the YM240 the first time I went to clean it. The o-ring in there intended to seal it in place was not only too fat, crushing the mating surface on the filter, it had also turned into adhesive tar from the heat. I had to replace the strainer. Don't create this problem, in that application!

 

[Scotty Dive]

I partially gave up. I got up at daylight and it was 3 degrees out. Suited up and realized quickly that I had to the take the fender off, possibly the tire and some additional items to gain access. Problem was I was suited up like an astronaut and what would normally take seconds took minutes. At the 45 minute mark my hands were numb my feet were numb and the straw that broke this camels back was I was having trouble getting a socket onto the ratchet and without thinking put the socket to mouth to assist in orientating it correctly and the **** thing almost froze to my lips. I gave up and hope that next weekend it warms up enough to work on it. I have a decent hydraulics place near by and hope they can match the oring assuming that is the problem.

 

[runningbird]

if your loader plumbing uses any quick disconnects I would check them all. Even with the loader functioning you could have one that was dislodged just enough to prevent flow.

 

[Scotty Dive]

Definitely a good thing to check is the quick disconnects. I, however do not have any on this machine

 

[HoyeTractor]

That model has an unusually complicated mess of linkages so that would be my first suspect but it could also be an oring or even a broken relief valve spring.

 

[Scotty Dive]

That model has an unusually complicated mess of linkages so that would be my first suspect but it could also be an oring or even a broken relief valve spring.

View attachment 534921

That is a very helpful schematic. So my plan of attack is to get 59 off and look inside correct? What numbers would I be specifically looking at for the relief spring?

 

[winston1]

That is identical to my old 2002D which is made for the tiller cable controlled draft control. Doubting it is your problem but I know if you get the draft control handle all the way back or forward it will stop the lift from working. Can't remember Whether back or forward. Probably not your problem but something to ponder.

 

[clemsonfor]

I don't have anything else to add except, it may be time for a back up tractor.
Maybe you can use your bucket until it warms up
High here today was 36. 36 would probably be considered a heat wave where you are

If I'm looking at it right,That O ring doesn't look to be a difficult job. Might find something that will fit in an O ring assortment

I think that's an application where the identical o-ring is needed.

I found the 'strainer' (wire mesh hydraulic filter) cemented in solid in the YM240 the first time I went to clean it. The o-ring in there intended to seal it in place was not only too fat, crushing the mating surface on the filter, it had also turned into adhesive tar from the heat. I had to replace the strainer. Don't create this problem, in that application!

I really late but for other in the future reading this yanmar uses a Japanese spec oring that is not common here. Its not the metric sizes that are common and definitely not SAE. For critical seals you need the correct one, other less critical you can sometimes fit an SAE or metric that is very close in the application and get away with it.

 

[Scotty Dive]

I would wonder if something back in the 3 point area could have frozen. Loader working should eliminate the pump key.

Winner winner, chicken dinner. Warmed up a bit here and I started it up and the 3pt worked just fine. Must have had some moisture in the oil. The only way I could be getting water in there is from the shift boot. I have gone through three in 6 years. I hardly ever shift the gears with the power shift but the boots always split. Will drain it when I get over to tractor supply to get some new oil.

 

[clemsonfor]

I was thinking ice in the oil too, or I'm the valve. Glad you figured it out.
Moisture from condensation as well. All these people who onky change their oil once a decade cause they only put 10 hours a year on the tractor probably have all kinds of water and rust in their sumps. There not sealed to the environment so moisture in and cold temps will cause that condensation inside

 

[rScotty]

Winner winner, chicken dinner. Warmed up a bit here and I started it up and the 3pt worked just fine. Must have had some moisture in the oil. The only way I could be getting water in there is from the shift boot. I have gone through three in 6 years. I hardly ever shift the gears with the power shift but the boots always split. Will drain it when I get over to tractor supply to get some new oil.

It certainly could be moisture coming in past the shift boot. Yanmar issued a technical bulletin on that very problem back in about 1982 - I've got a copy of it somewhere. They promised to redesign the boot, but said in the meanwhile people should shift the lever to a position that didn't stress the boot when they leave the tractor for the evening.
Now that's my kind of "down home" tech bulletin.
rScotty

 

[clemsonfor]

It certainly could be moisture coming in past the shift boot. Yanmar issued a technical bulletin on that very problem back in about 1982 - I've got a copy of it somewhere. They promised to redesign the boot, but said in the meanwhile people should shift the lever to a position that didn't stress the boot when they leave the tractor for the evening.
Now that's my kind of "down home" tech bulletin.
rScotty

Even better, keep a gallon plastic bucket a d put over the shifter while it's in neutral. Haha