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John Deere 316 Turning on pto kills engine


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#1 TLP OFFLINE  

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Posted June 05, 2016 - 02:20 PM

I have a 1989 jd 316 with the onan engine,when i turn the pto on it kills the engine.Here is what i have done so far,replaced the pto switch,checked the seat,neutral switches ok there unpluged the pto clutch and it still kills the engine.What should i look for next ?I thought about trying another set of wires from the battery to the clutch ?



#2 Cat385B ONLINE  

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Posted June 05, 2016 - 03:02 PM

You're on the right track. Short in the wire somewhere maybe. Where is the pto safety on the 316? Is it part of the switch?
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#3 TLP OFFLINE  

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Posted June 05, 2016 - 03:13 PM

Not sure 



#4 KC9KAS OFFLINE  

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Posted June 05, 2016 - 03:33 PM

TLP, 1st of all :welcometogttalk:

 

You will need to find a JD manual if you can so you can trouble shoot it.

There are a lot of manuals here and on the www, but I understand that the green/yellow manuals are not easily accessible because dealers still sell 'em.

Maybe a JD collector here has one and can better help you!


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#5 TLP OFFLINE  

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Posted June 05, 2016 - 03:37 PM

I have the tech.manual about 1 in thick but im still lost lol



#6 Leonard VanCamp OFFLINE  

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Posted June 05, 2016 - 10:38 PM

If you have a wiring diagram trace the wires back from the PTO. If it kills the tractor even with the PTO unplugged then there's probably a short somewhere, since there is no draw from the electromagnetic clutch.
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#7 NathanM OFFLINE  

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Posted June 14, 2016 - 04:54 PM

Test the regulator/rectafier. My 12 hp kohler was doing that.
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#8 Trav1s OFFLINE  

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Posted June 14, 2016 - 06:02 PM

You need one of those 318 experts to chime in.  I am of little help on the new stuff.   :watch_over_fence:



#9 WNYTractorTinkerer ONLINE  

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Posted June 14, 2016 - 06:41 PM

Test the regulator/rectafier. My 12 hp kohler was doing that.

It was the PTO pulling too much juice due to low alternator / stator voltage output.  

 

If the Coil voltage drops below ~10.5 VDC it won't make fire on a Kohler..  

 

An Onan has electronic ignition so it is independant of the charging / battery ignition systems..

 

A low power or too much drag on the PTO situation is the cause..  The usual interlock on that is a seat switch or possibly the PTO switch or relay/wiring..  


Edited by WNYTractorTinkerer, June 14, 2016 - 06:51 PM.


#10 mtoney OFFLINE  

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Posted June 15, 2016 - 11:20 AM

I would look toward  a failure of the time delay module(black box behind battery).  They tie all the safety switches together, sort of a brain box with what they call a time delay circuit, so when you bounce up and down in the seat, the PTO/Engine doesn't die instantly.  They do go bad and they are not cheap.  They are a common failure item on 316/318's   Changed many of them over the years in both models, and the symptom was the same, turn the pto switch on, even with the clutch not hooked up and she would die.   Mike


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