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John Deere 318


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#1 jjisdeerhuntin OFFLINE  

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Posted May 23, 2013 - 06:52 PM

I have a John Deere 318 with an Onan engine. The problem I am having is that the engine run great when the pto is off but when I turn it on to mow it just run like crap. Turn it off and it runs great. I have put a new coil in it and replaced the carb. Does anyone have any ideas on what this problem may be.
Thanks,
Jake

#2 olcowhand OFFLINE  

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Posted May 23, 2013 - 07:03 PM

Likely it's a pto clutch beginning to short out.  Draws so much current that it pulls power away from the coil.  To rule out any wiring issue between the battery & the pto, you could run a temporary wire direct from the battery to the pto clutch.  If it mows & runs fine like this, then there's a wiring issue.  If it still runs like crap, then more than likely it's the clutch itself.


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#3 Rock farmer ONLINE  

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Posted May 23, 2013 - 07:07 PM

I would look for a wire grounding out when the pto is energized . Maybe somewhere a wire has had it's insulation worn down?

Of course, I'm assuming its an electric clutch!

Joe

#4 crittersf1 OFFLINE  

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Posted May 23, 2013 - 07:50 PM

Sounds like a short in the clutch. :welcometogttalk:



#5 New.Canadian.DB.Owner OFFLINE  

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Posted May 23, 2013 - 08:09 PM

Olcowhand is never wrong, but my first thought was that the engine's governor system isn't compensating for the extra load of the blades spinning. 



#6 motobreeder OFFLINE  

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Posted May 23, 2013 - 08:20 PM

If the belt has jumped off an idler pulley, it could be running through tight places and that will cause enough load to stop most motors.  Make sure the mower deck isn't seized.  Try engaging the PTO without a belt on it.


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#7 motobreeder OFFLINE  

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Posted May 23, 2013 - 08:24 PM

Almost forgot my manners - this is a new person's first post.   Welcome to the forum.



#8 olcowhand OFFLINE  

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Posted May 23, 2013 - 08:47 PM

Olcowhand is never wrong, but my first thought was that the engine's governor system isn't compensating for the extra load of the blades spinning. 

 

I truly appreciate that thought, but trust me, I am wrong more than I care to be. 

 

Almost forgot my manners - this is a new person's first post.   Welcome to the forum.

 

You know, I completely missed that!  Welcome Jake!   :wave: 



#9 JDBrian OFFLINE  

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Posted May 24, 2013 - 05:44 AM

Welcome to the forum. It could be electrical as others have said but also could be that the engine has an issue that shows up only when it's under load. A quick once over to check for fuel system or ignition issues may turn up some problem. Good luck getting it sorted out!



#10 Jehtro OFFLINE  

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Posted June 13, 2013 - 10:25 PM

I had that happen once, got bad gas,drained the tank, fixed the problem. Mine was in the winter and would act like that when the blower went under load.

 

jk






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