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off color Kubota MX5200
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Tracy Martin TN View Drop Down
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Joined: 11 Sep 2009
Location: Gallatin,TN
Points: 10728 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Topic: off color Kubota MX5200
    Posted: 17 Oct 2021 at 6:39pm
Friend has a Kubota MX5200. Engine ran away and he could only stop it by putting PTO in gear and getting off of seat.  Won't start now, it turns over and seems to have compression. Pump has a electric solenoid on it, it like rail system fuel delivery. Anyone out there have an idea what went wrong? Thanks, Tracy
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Tbone95 View Drop Down
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Joined: 31 Aug 2012
Location: Michigan
Points: 12080 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tbone95 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2021 at 6:34am
No, but why would you try to start it if you don't know why it ran away?  Is....the pto off now?
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DiyDave View Drop Down
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 53698 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2021 at 6:01pm
If an oil seal blew in the turbo, if so equipped, that is a common cause.  I'd take the question to the kubota forum, link below...
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ryan(IN) View Drop Down
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Joined: 11 Sep 2009
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Points: 770 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ryan(IN) Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2021 at 6:38pm
If he didn’t turn the pto off it won’t restart. Does the fuel solenoid move?
ryan
1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62
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Tracy Martin TN View Drop Down
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Joined: 11 Sep 2009
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Points: 10728 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2021 at 9:10pm
Ryan, turned the pto off. I think it is a computer problem with the electronic firing of the injectors. The solenoid does shake some for a few seconds while electric lift pump does its stuff. After talking with some Kubota service techs today, I found that the wiring harness on the newer Kubota tractors have some bugs. There have been a few runaway engines on the MX5200's. The service techs seem to know very little other than wanting to swap engines. I wanted to know why this one ran away. Can't talk to anyone that has any common sense. I am going to stay after it just to have peace of mind. Yes, we are prepared to shut it off immediately if it tries another run away. Any help always appreciated. Thanks, Tracy
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Tracy Martin TN View Drop Down
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Joined: 11 Sep 2009
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Points: 10728 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2021 at 9:13pm
Originally posted by DiyDave DiyDave wrote:

If an oil seal blew in the turbo, if so equipped, that is a common cause.  I'd take the question to the kubota forum, link below...

Dave, I had already thought of that, but after the seat switch and pto switch killed it, I think it is something else. Thanks for any help. It is always appreciated. Tracy
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Dusty MI View Drop Down
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Joined: 13 Sep 2009
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Points: 5058 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dusty MI Quote  Post ReplyReply Direct Link To This Post Posted: 19 Oct 2021 at 2:45pm
I've never had a diesel, but was told that the easy to shut down a runaway diesel is to remove the rain cap on the air intake and put your hand over it to block off the air. That would starve it of air. 
I wonder how much vacuum there is, and what that would do to your hand? 
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JoeM(GA) View Drop Down
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Joined: 12 Sep 2009
Location: Cumming,GA
Points: 4788 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JoeM(GA) Quote  Post ReplyReply Direct Link To This Post Posted: 19 Oct 2021 at 6:51pm
never, never, ever use your hand, or a rag, etc. we used to keep a thick piece of plywood with a sheet of rubber on it to drop over the intake it one ran away
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8556 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 19 Oct 2021 at 7:29pm
Yeah...a board not your hand
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 19 Oct 2021 at 9:06pm
28 - 30 inches of vacuum is the most vacuum it can pull and that won't hurt your hand. I do agree a board works much better.                     MACK
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AC720Man View Drop Down
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Joined: 10 Oct 2016
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Points: 5167 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AC720Man Quote  Post ReplyReply Direct Link To This Post Posted: 19 Oct 2021 at 9:16pm
What causes a run away diesel? Broken fuel arm where it attaches to the throttle? Pump? You would think a computer these days would prevent it from happening. Have heard of it, but thankfully haven’t experienced it.
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Tbone95 View Drop Down
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Joined: 31 Aug 2012
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Points: 12080 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tbone95 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Oct 2021 at 7:05am
Originally posted by AC720Man AC720Man wrote:

What causes a run away diesel? Broken fuel arm where it attaches to the throttle? Pump? You would think a computer these days would prevent it from happening. Have heard of it, but thankfully haven’t experienced it.
Various reasons.  As mentioned above, it frequently comes from the oil at the turbo, possibly anywhere else it could suck oil.  A diesel, especially warmed up good, can run on the oil, and since it's past the pump and governor and essentially "unlimited" supply, it will run away.
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Ray54 View Drop Down
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Joined: 22 Nov 2009
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Points: 4700 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ray54 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan 2023 at 7:08pm
LOL Now that is tractor forum scammer if ever I saw one. Cannot tell a car from a truck or a tractor as he rambles. LOL
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ryan(IN) View Drop Down
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Joined: 11 Sep 2009
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Points: 770 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ryan(IN) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jan 2023 at 7:21pm
Especially since an Mx doesn’t have def.
ryan
1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62
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