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  1. #11
    New Member
    Join Date
    Jun 2014
    Posts
    4
    Location
    Lunenburg, VA
    Tractor
    JD 850 4x4

    Default Re: JD-850 FUEL Return

    Chris,
    When I spoke I was the adult in the room. I am a diesel mechanic, own a farm, so certainly not a greenhorn from suburbia. Great little tractor other than its color. I made no mistake in my posting. While this thing is cute and works good, it has no position on a real farm. Its 10 or more HP for its size short in PTO area, a tad light, too. Really needs the tires weighted. I have a set of rear weights that will go with it.
    I bought this tractor and had it running within an hour. My post was about fuel return flow or seemingly a lack of it. Its not a keeper, never was.
    It would already be gone, for a good price and with a happy buyer, except I have recently been grounded by the VA Doc for a pulmonary condition. When I get the green light from Doc, the 850 will get shiny green paint, and a new owner.

    Quote Originally Posted by chriswheeler View Post
    I guess the high priced Deere parts thing cuts both ways. I have lots of neighbors with tractors and it seams some price their parts much cheaper, but in the end they always seam to end up with more problems needing more replacement parts. Had a Yanmar, it was a very reliable tractor, and when it did need parts, they were much cheaper than Deere parts. Trouble was, even Hoye tractor, the parts supplier couldn't get every part, some things just weren't available for any price. Deere, even though expensive, has never failed to have something I need be available. What I'm talking about here is product support, some just don't have it, some do. I'm sure the price for maintaining that availability is passed on to the customers in the price of the parts as well as some price gouging. That 850 was a very reliable tractor in it's time, and still should be in good condition. but only you know what it's been through in it's service life. Might want to give a good look at what the replacement will cost before making that decision.
    Chris

  2. #12
    Gold Member
    Join Date
    Nov 2004
    Posts
    436
    Location
    Nevada
    Tractor
    John Deere 970TLB, John Deere 125 automatic

    Default Re: JD-850 FUEL Return

    Post was not intended to be some sort of personal attack or even personal critique, just a statement of what I've seen as well. Hope no offense was taken. Your application only you will know and be able to judge. My experience with diesel engines is limited to large stationary stuff, little with stuff that can move. If you need to pull a 12' disc, it's sure not the right machine around your parts. Good luck with the VA, I'm lucky enough to have not needed to go down that road yet, but I could surely meet you in line there some time for the same reason. Again, hope no offense was taken, mine was a comment on quality, not suitability to your application or situation.
    Chris

  3. #13
    New Member
    Join Date
    May 2017
    Posts
    2
    Location
    Washington, Illinois
    Tractor
    John Deere 850

    Default Re: JD-850 FUEL Return

    Help I have the same issue, does the fuel reservoir and lines that return to the tank need to be full. Mine are not sand it won't run. I also see bubbles coming out around an injector. I am assuming that is sucking air.

  4. #14
    Platinum Member
    Join Date
    May 2014
    Posts
    600
    Location
    Paarl South Africa

    Default Re: JD-850 FUEL Return

    Pushing air out. Did you replace the internal washers ?

  5. #15
    New Member
    Join Date
    May 2017
    Posts
    2
    Location
    Washington, Illinois
    Tractor
    John Deere 850

    Default Re: JD-850 FUEL Return

    If you were talking about the ones around the injectors I have not. I have not been able to get the injectors out and I'm not sure if they unscrew or pull out. They are very tight in there.

    I will tell you how it started and what I have done.

    The tractor head white smoke coming out of the bypass tube so I thought I would clean out some of the lines and the fuel filter to see if that helped it did not. Then took off the lines to the injector pump which is gravity fed and bleed the lines. That didn't help. i then tried to take out the middle of three injectors but it wouldn't come out and so I put the screws back on it and screwed it in but may have over tightened it and shoved it into the hole about a centimeter further than it probably should. then the tractor started smoking black smoke out the stack. Drove it around the lawn and it's still smoked black. Then unfortunately I decided to take the fuel pump out and disconnect the governor and cleaned it and put it back in and ever since then I haven't been able to get the tractor started. But it may be because I have air in the lines going to the reservoir tank that feeds the glow plug. I have disconnected the fuel lines at the injectors multiple times and I get some fuel spitting out of each one but not enough to fill up the reservoir lines.

  6. #16
    Veteran Member
    Join Date
    Dec 2001
    Posts
    1,249
    Location
    Maryland

    Default Re: JD-850 FUEL Return

    The reservoir for the glow plug does not need fuel in it to run. It will fill on its own after it runs for a while. There is a very small amount of return fuel from injectors. If you need fuel for the glow plug before it is full, you could fill it manually. Is the fuel rack on the pump moving when you move the throttle? If the linkage got bent when you removed the pump, it could bind and not allow it to move to the run position. Also, did you disassemble the pump when it was out? The copper washers that seal the delivery valve holders should be replaced. If the copper washers leak, it won't allow pump to build pressure and tractor will not run. The leak will not leak to the outside where you can see it. It leaks internally.

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