JD 850 (Yanmar) Internal Clutch Linkage Issue

[Niji]

I was working my farm road on a hill the other day and I pushed in the clutch to let my tractor roll freely backwards. I heard a pop and the clutch disengaged. The exterior linkage to the clutch pedal is fine, so whatever went is inside the bell housing. The clutch presses and releases normally but does not disengage the clutch. I had the transmission in low reverse and so I just drove it backwards to the house and killed the engine.

Reviewing the shop manual and a couple of videos online, I see there is very little in there that could go wrong, so I am curious just what this could be? There has never been any slippage or weirdness with the clutch, so I am pretty certain this has to be the internal mechanisms to the throwout bearing. Could this be caused by both release springs breaking? Well, no not that bacause the retraction and release tension on the clutch remains normal and I think those springs are responsible for that. So, is there some pin that might have sheared that holds the throwout bearing fork piece to the shaft coming from the clutch pedal linkage? There's just not that much to it, and I'm not really clear on just how this could be.

Thanks!

 

[Harry in Ky]

I would suspect something gave up on one of the release levers on the pressure plate. You'll find out when you split it.

 

[winston1]

I think a split is inevitable.

 

[Niji]

Yeah, that's what I was figuring. Splitting, here we come!

 

[bmaverick]

Yeah, that's what I was figuring. Splitting, here we come!

The Hoye video is helpful, however, you will need to DRAIN the hydraulic fluid to split the tractor. Or be very very very fast at plugging the suction pipe under the right side foot rest when you take the rubber hose jumper off.

I would drain the fluid. If you did a fluid change not long ago, then SAVE the fluid. You can filter it, then put back into the JD850.

ONLY use JDM J20C in our machines aka Hy-Gard or Yanmar TF500A. You can use store brand licensed J20C as well. it must state 'meets' and never compatible with.

 

[Niji]

Thanks for the info BMaverick. I've gotten a lot of parts from Hoye over the years and I came up with that video yesterday and gave it a look. I also found one on Youtube of a guy splitting a JD 950. And I will take your advice on the hydraulic oil. I hope to begin the great undoing tomorrow and get down to splitting in the next couple of days.

 

[bmaverick]

Thanks for the info BMaverick. I've gotten a lot of parts from Hoye over the years and I came up with that video yesterday and gave it a look. I also found one on Youtube of a guy splitting a JD 950. And I will take your advice on the hydraulic oil. I hope to begin the great undoing tomorrow and get down to splitting in the next couple of days.

If you get stuck at any point, jump on here and ask right away. Someone might be here to response.

 

[Niji]

Hey hay! The FEL is off--first time ever. That's a start!

 

[Niji]

Got the JD 850 split today--it was a WAY easier job than I thought it would be. Very straightfoward. And when I got in there, one spring had come off the gizmo holding the throwout bearing that is attached to the clutch pedal linkage, and one surface of clutch pad had crumbled into oblivian, but I got lucky and all of my rotor surfaces came through unscathed! It seems that this is the original clutch and that the tractor had never been split before--so hey, put in a new clutch and call it good for another 40 years! Ordering parts tomorrow morning, and I think this should be just a regular clutch job at this point.

 

[bmaverick]

Got the JD 850 split today--it was a WAY easier job than I thought it would be. Very straightforward. And when I got in there, one spring had come off the gizmo holding the throw-out bearing that is attached to the clutch pedal linkage, and one surface of clutch pad had crumbled into oblivion, but I got lucky and all of my rotor surfaces came through unscathed! It seems that this is the original clutch and that the tractor had never been split before--so hey, put in a new clutch and call it good for another 40 years! Ordering parts tomorrow morning, and I think this should be just a regular clutch job at this point.

Ah, so happy for you.

A new clutch, some cleaning and bolt everything back together.

Fredricks

Fredricks Equipment - Agriculture dealer offering parts in Hartselle, AL, near Florence, Birmingham, Madison, Huntsville, Nashville, and Athens

Fredricks Equipment in Hartselle, AL, offering parts of agriculture equipment near Florence, Birmingham, Madison, Huntsville, Nashville, and Athens

fredricksequipment.com

Steven's Tractor, BEST PRICE,

https://www.stevenstractor.com/home/8-1-2-clutch-disc-for-john-deere-kubota-yanmar-many-other-compact-tractors.html

Southern Global

Clutch Disc, CD-85013YM

Clutch Disc, CD-8513, CD-4276, 194320-21401, 194276-21402, 794081-21400, 194275-21400, 194320-21510, M802964, CH18375

southern-global.com

 

[Niji]

Taking the tractor apart is turning out to be easier that finding the rights parts! I have a dual clutch in this one, and finding that clutch plate that goes inside of the clutch sandwich gizmo is a trick. It is looking like Southern Global may have it, but I have been striking out elsewhere. Once I get everything found and sorted I will post what I managed to come up with here....

 

[Niji]

Okay...I found both clutch plates and throw out bearing for the dual stage clutch in my JD 850 with shipping at just under $250 at Southern Global Tractor. They were the only place that I found with all three parts for the dual stage, and I was pleased to find that the person on the other end of the phone was very capable of getting the right parts sorted out with me. They did not have the bushing that goes into the carriage assembly for the throw out bearing, and mine is worn pretty badly. The JD number for that part is CH-13095. Luckily a search of Ebay turned up a new one in an opened box for $25 with $4 shipping. So now I await the deliveries. By the way, JD did list all of these parts as available and their total for them was nearly $1050. Wow is all I'm going to say.

For this dual stage clutch I see that there is a special tool made for adjusting the PTO assembly "clutch fingers." That tool, JDG-52, is just a special measuring tool that looks like a carpenter's square with two right angles instead of one. Luckily I see that someone here on the Forum has posted a diagram of it with measurments, so I am going to whip one out of metal, or maybe even stiff cardboard...the link to that post is here:Drawing & Measurements for JD Clutch Adjustment Tool - JDG-52

I hope I can get the adjustments all dialed in correctly--I have the shop manual, so the whole process is detailed there. So that's the update, and I hope to be running again by next week sometime....

 

[bmaverick]

Okay...I found both clutch plates and throw out bearing for the dual stage clutch in my JD 850 with shipping at just under $250 at Southern Global Tractor. They were the only place that I found with all three parts for the dual stage, and I was pleased to find that the person on the other end of the phone was very capable of getting the right parts sorted out with me. They did not have the bushing that goes into the carriage assembly for the throw out bearing, and mine is worn pretty badly. The JD number for that part is CH-13095. Luckily a search of Ebay turned up a new one in an opened box for $25 with $4 shipping. So now I await the deliveries. By the way, JD did list all of these parts as available and their total for them was nearly $1050. Wow is all I'm going to say.

For this dual stage clutch I see that there is a special tool made for adjusting the PTO assembly "clutch fingers." That tool, JDG-52, is just a special measuring tool that looks like a carpenter's square with two right angles instead of one. Luckily I see that someone here on the Forum has posted a diagram of it with measurements, so I am going to whip one out of metal, or maybe even stiff cardboard...the link to that post is here:Drawing & Measurements for JD Clutch Adjustment Tool - JDG-52

I hope I can get the adjustments all dialed in correctly--I have the shop manual, so the whole process is detailed there. So that's the update, and I hope to be running again by next week sometime....

A great post with plenty of good info. Even the found tool diagram. I'll have to save it as well since these Yanmars use it as well. The JD1050 is the YM4300.

The TM1192 covers JD850, JD900HC, JD950, JD1050, YM2500, most of YM2610, and YM4300.

Fredricks may have the bushing you found on eBay.

Glad you are using the Yanmar suppliers. I mention to people how the JD parts are pricey. You can literally see why.

 

[Niji]

Hey Bmaverick--on that bushing...I thought I had found it at Fredericks, but when we cross referenced the JD number we discovered that the type they have (and they had 50 in stock, so I was doing a happy dance there for a sec) was for the single stage clutch and they did not have the right one for the dual stage. I had to search the JD number for the dual stage one, CH-13095, online to come up with it.

And yes, it super duper pays to check pricing. I've only had one issue with substandard parts over the years, and I've ordered a lot of stuff. I got a front stub axle one time that had been made in India and that sucker sheared right off when I installed it. The supply house replaced it right away, and I put that second one on and it sheared right off just driving down the driveway test driving it! Unreal! So I got a refund, went to another supplier and got a Chinese made one and it has been doing fine for a year now. I'm going to be careful not to get the Indian stuff in the future after that experience!

 

[etpm]

So I got a refund, went to another supplier and got a Chinese made one and it has been doing fine for a year now. I'm going to be careful not to get the Indian stuff in the future after that experience!

I remember when stuff from Taiwan was the worst, then Chinese stuff took over while stuff from Taiwan improved a great deal. Now most Chinese stuff I am forced to buy is mostly while metal parts from India are terrible. The stuff I'm talking about is mostly metal stuff for use in machine shops and much of the stuff is only available from Asian countries. I find it interesting how the quality has improved from one nation to the next. However, the very worst metal parts I have ever seen have been from India. Just terrible quality. No surprise either after watching videos of men pouring cast iron wearing only sandals for footwear, no gloves, and no eye protection. It seems like nobody is willing to spend even a tiny amount for safety and worker protection, so no wonder the quality of the metal is crap.
Eric

 

[careyo63]

Grand father worked At a steel mill, Fayette Co. WV. is the city I believe. There for Decades. Everybody wanted his Job. Crane Operator. Eventually AC. even before he retired! LOL..
Went through the Vn. Tractors in Ga. big time back in the Day! Terrible on parts. Nice paint jobs though!
How I found my All Org. YM2000. Kicking tires when I found it in 2008. Fredricks supplied dealer. Seat and Muffler was replaced that was about it! Knew where he was across from the Atl. motor Speedway! Many conversations come up at that trac. about Yanmar and the Good ole boy days!. Yanmar roll over was often Trust me!! Snowed in the Mothers motor coach etc.. Oh some conversations was interesting Trust Me!! 1 to the day from the comments she made.
Referb. Ym2500 from Spalding and BH. also in 2009! It was Nice and everything work really well! The Yrs. they kept it or may still have it I only had to Go straighten something out Once or twice. New Operator and Hyd. line at the pump. Looked as though somebody left the PTO. lock on. knob just under the seat. It was leaking at the Hyd. line O-ring on the pump. Tightened it up and it quit. Retired Catholic Priests Property. Actually, they was really cool!!
I ordered from Hoye and looked to be the same filter also. I was going through them so it really didn't matter. Super heavy after the first Oil changes which was kind of expected knowing what I was dealing with. Finally used the last one and seen the Fram Orange in a CL add from the same Dealer. Used The Fram for Yrs. but noticed they was out of inventory often so I just use NAPA. No complaints with either of them. I do like the Fram with the Grip to tighten it up though. I dented the El. cheapo's hand tightening it. L. hand even........ in the 900tach hrs I put on it. My lawn mower so I've cut a lot of grass with it over the Yrs.. Craftsman Garden tractor was what I replaced that was worn beyond repair in 4yrs.. The Org. Yanmar 16 and no sign of it not lasting that much longer to the day!
My 63 Ford has a 2 stage I had to replace it. Dealer replaced Clutch Pressure plate and repaired shifter 1350.00 Tow truck/Parts and it's nice.!!

 

[R Barger]

Hey Bmaverick--on that bushing...I thought I had found it at Fredericks, but when we cross referenced the JD number we discovered that the type they have (and they had 50 in stock, so I was doing a happy dance there for a sec) was for the single stage clutch and they did not have the right one for the dual stage. I had to search the JD number for the dual stage one, CH-13095, online to come up with it.

And yes, it super duper pays to check pricing. I've only had one issue with substandard parts over the years, and I've ordered a lot of stuff. I got a front stub axle one time that had been made in India and that sucker sheared right off when I installed it. The supply house replaced it right away, and I put that second one on and it sheared right off just driving down the driveway test driving it! Unreal! So I got a refund, went to another supplier and got a Chinese made one and it has been doing fine for a year now. I'm going to be careful not to get the Indian stuff in the future after that experience!

[Curious] Where in southwest Virginia. I have 3 of those John Deere 850s.

 

[Niji]

FedEx got the clutch plates and throw out bearing here today, a day ahead of schedule...wow! Still waiting on the bushing for the throwout bearing carrier that I had to order on Ebay, but I plan to dive into setting the clutch plate into the assemble and doing all of the adjustments. I am going to cut out that adjustment tool from the diagram mentioned above and see how it goes....

 

[Niji]

[Curious] Where in southwest Virginia. I have 3 of those John Deere 850s.

I just noticed your note--sorry for the delayed respose. I am in Floyd, VA. Wow, you have three of them? Are they all running or some for parts?

 

[R Barger]

I just noticed your note--sorry for the delayed respose. I am in Floyd, VA. Wow, you have three of them? Are they all running or some for parts?

2WD 700hrs use it to mow with a finish mower. 4WD 1400 hrs loader and backhoe use. I have another 4WD with a Curtis Cab only problem it has a spun bearing. A winter project when I get time.