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2007 X520 Stops While Mowing

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#1 Waitrain7317 OFFLINE  

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Posted September 02, 2016 - 04:09 PM



PROBLEM:  I have a 2007 John Deere X520 mower with a liquid cooled Kawasaki gas engine at around 400 hours.  Recently the engine started completely shutting down while mowing.  It will run strong at normal power for a couple of minutes and then just stop.  it takes a couple of minutes or so to get it started and running smoothly at which time it will mow for several minutes and shut down and the cycle continues.  When restarting it goes through a short period where the engine cycles between high rpm's and low rpm's.  Eventually it will maintain higher rpm's and run smooth until the next time the engine cuts off.  It will run for quite a while longer without the mower engaged but eventually will stop as well.


WHAT I'VE DONE:  It was time to do normal maintenance so I did the following:

-  Changed Oil and Oil Filter

-  Changed both spark plugs

-  Changed Fuel Filter

-  Changed Air Cleaner

This did not take are of the problem.



-  I removed and completely cleaned the carb and reinstalled.

This did not take care of the problem.



-  I drained almost all the gas from the tank.  Added a fuel system cleaner and stabilizer and refilled the tank

This did not take care of the problem.



-  Checked the fuel lines between the gas tank and carb, including the fuel pump.  Fuel is moving well and there are no cracks.

-  Checked the gas cap to verify air was venting.

This did not take care of the problem.



-  For kicks I removed the deck, sharpened the blades and completely cleaned and lubricated the deck.


I don't know what else to do.

Is there a sensor that can be causing the problem?

Is there something I'm missing?






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Posted September 02, 2016 - 04:12 PM

How is the spark generated on that engine? It maybe that the coil or magneato is breaking down due to heat

#3 Trav1s OFFLINE  


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Posted September 02, 2016 - 04:13 PM

Have you tried to verify if it has spark when it dies?  My suspicion is that it is heat/electrical related.

#4 jms180 OFFLINE  



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Posted September 02, 2016 - 04:37 PM


order you a set of these spark testers


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Posted September 09, 2016 - 07:08 AM

I think Tractorholic is on the fix .    

#6 Waitrain7317 OFFLINE  

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Posted September 09, 2016 - 10:35 PM

Thanks everyone for your help.  I decided to go ahead and replace the Trigger Coils today.  It took off and purred better than normal.  I mowed for about 30 minutes and thought I finally had the problem licked.  Then all the sudden the engine stops.  I go through the same process and eventually get it started.  Runs GREAT...for another 10 minutes and dies.  I'm back at square one...other than I have new trigger coils along with all the other maintenance and fixes I've recently done.

#7 Alc OFFLINE  



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Posted September 10, 2016 - 04:26 AM

I never saw those plug testers that jms180 posted but they sure would be handy when a problem like yours comes along . Do you have a wiring diagram of the tractor ? Thinking it has a maze of relays switches and all sorts of safety items .