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Kubota B7800 Engine Stops

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jr1228ideal
Join Date: Mar 2014
Posts: 7 Shipshewana,IN
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2014-03-20          189647


I am having my 2004 B7800 tractor shut down sometimes while driving on road and can't restart. Other times I shut off motor and 10 minutes later try to start again and it turns over but doesn't start. It acts like a gas motor would with spark plug unplugged. I had it looked over by a Kubota dealer with no results.

Of course it didn't act like that when they had it. any ideas?

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Kubota B7800 Engine Stops

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kthompson
Join Date: Oct 2005
Posts: 5219 South Carolina
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2014-03-20          189648


What color is the exhaust when you are cranking the engine over and it will not start?

Look in the fuel tank for a piece of trash than can float but will be sucked to and closed the fuel outlet when running and remain there till suction slowly releases. When it does this break a fuel line or unscrew filter to see if fuel is coming out of tank freely.

If it was doing it when taken to the dealer would think they would have looked for restriction in the air intake system such at mouse or wasp nest. ....

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Kubota B7800 Engine Stops

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mdpinh
Join Date: Feb 2009
Posts: 26 MA
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2014-03-20          189654


Hi
Did your dealer check the fuel and air systems?
Did he test the inject pump? Lets start there.

Mark ....

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Kubota B7800 Engine Stops

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jr1228ideal
Join Date: Mar 2014
Posts: 7 Shipshewana,IN
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2014-03-20          189658


I will check your suggestions next time it happens. thanks ....

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Kubota B7800 Engine Stops

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Art White
Join Date: Jan 2000
Posts: 6877 Waterville New York
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2014-03-20          189676



You didn't state what the hours are but there must be a few for the age. It could be a fuel flow issue, broken wire going to the shut off with several other possibilities.

Does it happen about the same amount of operating time?
Is the fuel tank about the same level? ....

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Kubota B7800 Engine Stops

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jr1228ideal
Join Date: Mar 2014
Posts: 7 Shipshewana,IN
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2014-03-20          189681


there are 1200 hours on the tractor. It doesn't seem to matter where the fuel level is. It happens so little that when it does happen its usually when its shut off for 5-10 minutes, and I want to start it again. But this morning it happened on the road which is [embarrassing] and hasn't happened for a long time. ....

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Kubota B7800 Engine Stops

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Art White
Join Date: Jan 2000
Posts: 6877 Waterville New York
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2014-03-20          189682



So your saying if you shut it off for 10 to 15 minutes it won't start. Then if you are going down the road it might stall? ....

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____________________________________________________________________________________
Kubota B7800 Engine Stops

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jr1228ideal
Join Date: Mar 2014
Posts: 7 Shipshewana,IN
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2014-03-20          189685


Just randomly, in the last 3 days it didn't start pry 2 out of 10 starts and hasn't happened for months and stalling in the middle of the road just once in pry 5-6 months. very frustrating. ....

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Kubota B7800 Engine Stops

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Murf
Join Date: Dec 1999
Posts: 7141 Toronto Area, Ontario, Canada
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2014-03-20          189687


The first thing that comes to mind to me is the fuel shut off relay is the issue, likely either the relay has gotten weak, or the wiring to it has some corrosion issues.

I'd check all wiring to the relay, especially the connections and grounds.

If it happens again try putting power straight to the relay/solenoid.


Best of luck. ....

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gaspur
Join Date: Jun 2012
Posts: 16 Elberton, Ga.
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2014-03-20          189690


How cold is the weather there and what kind of fuel are you using? ....

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bristan8
Join Date: Apr 2010
Posts: 61 Camden NSW, Australia
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2014-03-21          189693


Does that model have any safety cut out switches? My 2320 has one under the seat and also on the hydro pedal. If the hydro pedal doesn't return fully it wont start. If the switch under the seat is intermittent that could also cause your symptoms. I adjusted my switch on the hydro pedal so that it most always operate correctly these days. ....

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jr1228ideal
Join Date: Mar 2014
Posts: 7 Shipshewana,IN
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2014-03-21          189694


The temperature is 30 - 40 and fuel from the local supplier or some times gas station. Last night it did it again then this morning pops of on the usual first crank. I tried releasing pressure from fuel line but it didn't help. Thanks for all the suggestions. ....

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Art White
Join Date: Jan 2000
Posts: 6877 Waterville New York
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2014-03-21          189695



Right now for what I've read I'd be looking at the wires and fuel shut off as Murf suggested. When you are cranking does it show any signs of smoke? ....

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jr1228ideal
Join Date: Mar 2014
Posts: 7 Shipshewana,IN
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2014-03-21          189699


No smoke at all. Called local dealer and they suggested cleaning solenoid post wire connection.
....

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Art White
Join Date: Jan 2000
Posts: 6877 Waterville New York
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2014-03-24          189751



That is a good start. We often find a weak connection with the wiring is often the problem. ....

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