John Deere 6220 ‘hunting’

Tractorjoe

Member
Mixed Farmer
Hi, not sure if anyone can help or had similar problems. Sorry for the long message!
I’ve got a John Deere 6220 which isn’t a common rail engine. When you run the tractor hard with the PTO running in warmer weather it starts ‘hunting’. It doesn’t return to idle, it sticks. If you turn it off and turn it back on, it doesn’t idle at 850.
I have changed the electronic lift pump, PTO speed sensor, engine speed sensor and all the fuel lines. It is also regularly serviced.
I have spoken to my John Deere dealer and they weren’t sure, said it could be the high pressure fuel pump but it doesn’t do this all the time.
I have had it plugged in, showing no error or fault codes where it is so intermittent. You can occasionally start it up in the morning and it’ll hunt in the yard when warming up on tick over.
I don’t know if this is linked to it but the battery light always comes on when you start it up. If you rev it up, the battery light will turn off. I have also changed the battery and alternator and that hasn’t solved it.

Any advice would be greatly appreciated.

Thanks, Joe.
 

Tractortech

Member
Location
Cumbria
Now Then...
If it isn't common rail, it won't have a suction control valve (SCV)!!
Have a look under the bonnet. See which fuel injection pump it has. There's a Stanadyne one with a mechanical throttle control or the all electric Stanadyne DE10..
 
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Bury the Trash

Member
Mixed Farmer
Just use the advanced search but at tge bottom of the search area ' Google customs

 

Tractorjoe

Member
Mixed Farmer
Now Then...
If it isn't common rail, it won't have a suction control valve (SCV)!!
Have a look under the bonnet. See which fuel injection pump it has. There's a Stanadyne one with a mechanical throttle control or the all electric Stanadyne DE10..
it’s the all electric control I have also change the potentiometer and speed sensor
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4C758FEA-F1FC-4D4F-A903-4E921A9B6358.jpeg
 

Tractortech

Member
Location
Cumbria
Do you have the engine management light flashing?? How many hours has it done?? Can you supply a picture of the engine side from further away so I can see the low pressure fuel hoses.
How long have you had this issue?? Did it happen suddenly or gradually?? 🤔
 
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Those d10 pumps went very reliable, looks like its had a replacement plug put to it from ecu, chech all fuel pipes to it or just replace them there not expensive

Chech plug on ecu and wires to pump particularly the terminals on the 2 pin plug going into centre of injection pump.

If everything else is ok will need pump overhauling if you put a mug full of clean engine oil every fill up of fuel fill up seems to keep them going a bit longer
 

Tractorjoe

Member
Mixed Farmer
Do you have the engine management light flashing?? How many hours has it done?? Can you supply a picture of the engine side from further away so I can see the low pressure fuel hoses.
How long have you had this issue?? Did it happen suddenly or gradually?? 🤔
tractor has done 9,700 hours

occasionally when it starts hunting The glow plug light will come on but it’s not all the time

it’s always done it ever since I’ve had it only when you work it hard on the PTO
 

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Tractordave

Member
Location
West Kent, UK
It looks like your fuel return line orifice is missing. It may not be your problem but it’s definitely worth checking first. To test the theory put some locking pliers or a pipe clamp on the hose I’ve crossed. It will temporarily boost the inlet fuel pressure into the injection pump. If the hunting then goes away that could be your problem...
 

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Tractortech

Member
Location
Cumbria
Ahhhhh, as I suspected, item 6 in the parts drawing (L167846 Orifice) . Without it you'll probably have low fuel pressure at the injection pump supply
It may be worth looking at the old hoses. To the untrained eye it just looks like a hose joint..
Screenshot_20210504-204747_Chrome.jpg
 

Tractorjoe

Member
Mixed Farmer
It looks like your fuel return line orifice is missing. It may not be your problem but it’s definitely worth checking first. To test the theory put some locking pliers or a pipe clamp on the hose I’ve crossed. It will temporarily boost the inlet fuel pressure into the injection pump. If the hunting then goes away that could be your problem...
Thanks for that, it’s been a big help. I’ll get the orifice!
 

Tractorjoe

Member
Mixed Farmer
Those d10 pumps went very reliable, looks like its had a replacement plug put to it from ecu, chech all fuel pipes to it or just replace them there not expensive

Chech plug on ecu and wires to pump particularly the terminals on the 2 pin plug going into centre of injection pump.

If everything else is ok will need pump overhauling if you put a mug full of clean engine oil every fill up of fuel fill up seems to keep them going a bit longer
Thank you
 
We had this problem when we were new to JD. Turned out it was the rotary control on the R panel which sets the max revs for a particular job. We had it set for 540E speed. May be irrelevant here of course but a cheap fix if it works.
 
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Could a ‘Meat Tax’ be on the cards in the UK?

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Written by Richard Halleron from Agriland

The latest machination coming from the so-called ‘opinion formers’, who seem to have the ear of government advisors in London, is the introduction of a ‘Meat Tax’ at consumer level.

This approach, it is argued, would have the combined impact of reducing meat consumption levels (I can really see the health benefits coming through now), while also helping to reduce the overall carbon footprint of production agriculture.

What absolute drivel! In my opinion, none of this makes sense at any level. This is a scurrilous and unfounded attack on livestock farming in this part of the world.

Yet, it has to be taken seriously. I make this point because economists at Rothamsted Research have already crunched the numbers where the introduction of a ‘UK...
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