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 11-16-2003, 17:52 Post: 68928
Jkinney
2003-11-16 17:52:49
Post: 68928
 runaway then wont start

I have a 7274 I use commercially with 1600 hrs I lit her off today to do a few chores for myself, around the yard.
She started to run away while still in the barn, I shut her down with the key,restarted and let her Idle at 1200 backed her out of the barn and let her run for 15 min. I then got on her to move some soil and she ran away I turned the key off and she continued to run away I jumped off the seat and turned the fuel off and killed the engine. Turned the fuel back on, lit her off and she ran away again, again had to shut the fuel off to kill her. I tried to start her again and she wont start. I have cleaned the bowl primed the fuel system. no Luck I have bled the fuel system many times on this tractor with no problems. A diesel mech I know said the selenoid on the fuel pump might be bad. I can hear it click (lightly) when I try to start it, it clicks loudly when I turn the key off. any suggestions?






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 11-16-2003, 18:31 Post: 68930
loghouse95



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 runaway then wont start

Sounds like you might have a broken governer spring in the injector pump also Have you checked the governer on the throttle






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 11-16-2003, 18:46 Post: 68932
jkinney



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 runaway then wont start

Checked the throtle, all springs, cables attached and operating the selenoid my friend refered to is on the injection pump. Im gona hate to load this on the trailer and haul it to the dealer.






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 11-17-2003, 05:50 Post: 68946
Art White



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 runaway then wont start

Often when a diesel is just about out of fuel it will run up on rpm's. I would think that if your shutoff was about to fail that might be the culprit as it might have just about closed the fuel off before but not quite. Now it might have closed it off well.






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 11-17-2003, 06:47 Post: 68949
TomG

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 runaway then wont start

I'd guess that the mechanic was saying that a faulty fuel solenoid may cause the failure to shut down when the key was turned off but not the run away problem.

If 7274's use a jerk pump type system, the run away problem sounds like a governor or control rod problem. Many pumps and governors are the same unit and these units aren't serviceable except by trained techs. That sort of limits self-help and do it yourself repair.

You might check if the throttle lever moves when the hand throttle is changed and if the throttle lever operation is smooth and free throughout its range when the governor linkage is disconnected. However, chances are that knowing what the problem is still going to take a trip to the dealer for a new pump assembly. There is some potential for self-help. For example, there's a small chance that some lube on the counter-weight pivot points or replacement of broken internal governor springs fix it but you'd need a manual to know.

If the pump is shot there's a chance that a diesel shop may not need the whole tractor to repair or replace a pump as long as you were willing to do removal and installation. Installation would require setting the timing. Anyway that's another possibility for some self-help. I guess there's no chance the tractor was operated around propane or natural gas leaks when it ran away. That'd be a rare event but taking in propane would cause a run away and even shutting off the tank valve may not shut it down.






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 11-17-2003, 07:53 Post: 68955
Peters

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 runaway then wont start

From your description of what happens the mechanic and Art maybe right. If the diesel is in starved fuel mode then the diesel will often run up. Normally this is a run up and then the motor quits as it runs out of fuel.

If the fuel solenoid is not closing properly and possibly leaking air in then the run away condition could persist. I am not sure if it can damage the pump?

As the problem is related to the shut down. The shut off solenoid is the first place I would look. The relay connecting the solenoid to the switch is the second area.






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 11-17-2003, 11:52 Post: 68965
kwschumm



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 runaway then wont start

I'm a newbie to diesel engines and I don't understand how a diesel engine can runaway if the fuel is being starved. It seems to me that when fuel is starved the engine will run lean and quit. What phenomenon causes the engine speed to run up?






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 11-17-2003, 13:59 Post: 68971
Art White



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 runaway then wont start

To lean out any engine the first thing that happens is rpm gain.






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 11-17-2003, 15:52 Post: 68973
kwschumm



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 runaway then wont start

Thanks Art, I did not know that. I knew that lean mixtures resulted in hot running, burning valves and damaging pistons but I didn't know about the RPM gain.






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 11-17-2003, 18:13 Post: 68978
jkinney



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 runaway then wont start

The tractor went to the dealer today, FM Abbotts in Waterboro Maine. He spent about 15 minutes looking at it and is not sure of the problem. Regardless of a runaway he does not yet understand why she would not shut down when I turned the key off because he states the key shuts off the air valve.
He thought he will have an answer in a couple days.
His first check will be the selenoid.






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Discussion Boards > Active Subjects > Messages as Posted > Cub Cadet Forum

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