John Deere 850 tractor

[ckennedy1601]

I have a john deere 850 tractor with a three cylinder yanmar diesel motor. I just changed the oil and fuel filter. The tractor wouldnt start due to air in the fuel lines. I sprayed ether into the air cleaner to try and get it started. I then bled the lines and got it to start and run fine. The next morning i went out and checked the oil level before starting it. Diesel fuel came pouring out of the oil cap. What could have happened to cause this ??? Please help

 

[Domush]

No idea regarding the fuel in the oil, but I can definitely say I've read pretty much everywhere never to use ether in a diesel.

 

[winston1]

Stupid quiestion I guess, but is the "oil cap" where you check the oil or the cap on top where you fill with oil?

Don't guess it matters, diesel shouldn't be coming out of either. I'm thinking the only way diesel could flood your system that much with the tractor not running is to come through the injection pump and leak into the crankcase. I have never heard of this but lots of things I haven't heard of.

 

[careyo63]

Yep! sounds like a broken injector pump. Did you loosen the fuel line to bleed the pump? Thats about the only way your going to get that much fuel in the block. I believe the 850 is the same pump as the YM2500. I'm sure Hoye has it.

 

[ckennedy1601]

Yes i cracked the fuel lines that come from the pump to the injectors. How would i go about finding out if the pump is bad or if its just a seal that is letting fuel into the block?

 

[careyo63]

I would call Hoye there be the one's to talk to. I used and am familiar with the 2500 but IMHO a seal or gasket is Very Doubtful thats why I would talk to Aaron or one of his Guys

 

[Domush]

Obviously it is going to have something to do with the pump, so why not remove it and, with the fuel line still attached, see where the leak is happening? Then, at least, you will have something to go by and can work from there.

 

[careyo63]

Be real careful if you remove it. Thats another reason why I suggested to talk to Hoye. There' s couple of linkage pins that are hard to get to and remove I believe. If you bend it or get it out of time it's a Royal PIT:ashamed: to get back right.

I was right Aaron made a reply on a 2500 .

The only time I have heard of a governor problem is
1- a hydraulic pump shaft broke & the end got caught in the governor - freak accident
2- a person tries to pry their injection pump off without unhooking the internal linkages & breaks/stretches them.

 

[Barry 1]

Did you crack them loose at the pump,or up at the injectors?

 

[duke7595]

I had a John Deere 950 w/ loader a couple years back. The 950 is the next
model up a little more h.p., but the same concept.

You should have a Waring label on your tractor that states NEVER use EITHER.
These tractors are ruined quite often by owners using either.

Now the older John Deere's like the 820 were made to accept either. The same
820 I own started to get fuel into the oil. It turned out that the two seals
were bad on the injector pump, had them replaced and it was fine
Good luck.

 

[Neat 1500]

because the pump ran dry it flogged the plunger seals out, these will need to be replaced. for these reasons alone i run 2 stroke oil in my diesel to keep everything lubed...:thumbsup:

 

[brownie1]

My 1050 has to much fluid in the crank case. how do you determine if it is diesel or hydraulic fluid?
Is it possible for a seal on the hydraulic pump to go bad and let hydraulic fluid to get into the crank case?

 

[winston1]

My 1050 has to much fluid in the crank case. how do you determine if it is diesel or hydraulic fluid?
Is it possible for a seal on the hydraulic pump to go bad and let hydraulic fluid to get into the crank case?

Should have a diesel smell if diesel is leaking. Watch the transmission level for lowering of fluid. Yes, I have read of hydraulic fluid leaking through the pump. Also read of diesel leaking through the injection pump.

 

[clemsonfor]

Brownie you should start a new post. Instead of this zombie post.

And a post in the JD form may help more. Not saying we dont know what were talking about but ask the JD experts they will know the common failures. Better than us.

 

[winston1]

Brownie you should start a new post. Instead of this zombie post.

And a post in the JD form may help more. Not saying we dont know what were talking about but ask the JD experts they will know the common failures. Better than us.

He has a Yanmar with John Deere wrote on it. 3t90t-J engine, turbocharged. You are probably right about posting on the John Deere forum but I would be interested in the findings.

 

[kenmac]

He has a Yanmar with John Deere wrote on it. 3t90t-J engine, turbocharged. You are probably right about posting on the John Deere forum but I would be interested in the findings.

Yep, He has my tractor with a turbo,, If you have a good amount of diesel in the oil,, The oil probable wouldn't be as thick as straight oil (watered down so to speak).. If it were hyd fluid. I would think the oil would still be kinda thick

 

[clemsonfor]

oh ok, i was envisioning a much older tractor with an actual JD deisel in it from earlier.

 

[bmaverick]

because the pump ran dry it flogged the plunger seals out, these will need to be replaced. for these reasons alone i run 2 stroke oil in my diesel to keep everything lubed...:thumbsup:

Lycas upper lube works well too.

 

[bmaverick]

These JD850, JD950 and JD1050 are all YANMARS from the ground up. Not just the engines. I have seen all too often owners of these tractors getting really no response in the JD forums. Glad they swung here in the Yanmar section.

I had once owned a JD850. Good machine while it ran. The governor rod got bent and jammed and the #2 and #3 injector lines got swapped after a rebuild. The engine blew shortly there after. I had looked high and low for a 3T80 engine or head. No luck until I had found Fredricks. The price to overhaul the JD850 or get a YM2500 or YM2610 on trade-in was very close. I got the YM2610. Glad I did.
Happy with the quality and 1-yr warranty too. This will never be found on a Vietnam Yanmar.

 

[clemsonfor]

i knew the 850 and 950 were full yanmars but i guess i missed the 1050 as one, i keep seeing like the old 1020s in my head even though i read 1050