John Deere engine 6068 (Bateman) variable geometry turbo problem

[JohnDeere8530]

I have a 2008 Bateman RB35 fitted with what I believe to be a 6068 225hp John Deere engine

It sometimes loses power, to the point whereby it will not rev and go up hills. The errors produces are...

1569 Fuel Derate
2795 VGT callibration version
641 VGT actuator

The old owner had the same problem a while back and had Deere out to look at it - but it was never sorted. Both their and Bateman's stance is that "some engines do it and some don't". Obviously this is not ideal.

When the engine is started the linkage on the turbo goes through its test mode, ie moves to either extreme before settling down, so the mechanics of it seem ok at least?

Anyone have any ideas? I'm starting to think a software issue ?

​

 

[fieldfarmer]

Is there any slack in the linkage, have you had the fault show up while driving it while it's linked to the service advisor? Had a similar problem on a 7530 and what the ecu was asking the turbo to do was to far adrift from the actual vain position so would go into de rate mode until you eased off the request load.

 

[Farmer_Joe]

if it get hot the variable vanes can expand and jam on left over soot, can you take the linkage off and operate the vanes are they perfectly smooth?

i had to dismantle my mondeo st turbo as it had dont just this, its all stainless steel so was easy to clean but was sooted up, when they were try to move to vary the geometry they were binding on soot.

another problem i have heard of with variable turbo is the controller the arm is linked too, they get super hot next to turbo and solder within them can fail, but this usually would result in permanent fault, but its possible when its hot a connection is failing due to heat.

 

[NZ Tech]

The 641 code. Should be 641.07 or .xx. can you get the whole # please. Probably a failing vgt actuator. Tho i have seen this code with failing ecu as well.

I have a 2008 Bateman RB35 fitted with what I believe to be a 6068 225hp John Deere engine

It sometimes loses power, to the point whereby it will not rev and go up hills. The errors produces are...

1569 Fuel Derate
2795 VGT callibration version
641 VGT actuator

The old owner had the same problem a while back and had Deere out to look at it - but it was never sorted. Both their and Bateman's stance is that "some engines do it and some don't". Obviously this is not ideal.

When the engine is started the linkage on the turbo goes through its test mode, ie moves to either extreme before settling down, so the mechanics of it seem ok at least?

Anyone have any ideas? I'm starting to think a software issue ?

​

 

[fermerboy]

Think I'd be trying the Derv Doctor.

 

[JohnDeere8530]

ok thanks everyone I have a freelance JD mechanic coming out to look at it. In the mean time I will try and find Derv Doctor on the net

 

[Farmer_Joe]

my moneys on turbo actuator

 

[Timbo]

my moneys on turbo actuator

How.many hours she done?

 

[Robt]

Think I'd be trying the Derv Doctor.

Why, an he fix VGT turbos?

 

[Farmer_Joe]

Why, an he fix VGT turbos?

agree with this he just fits a std turbo of fixes the vanes from what i understand, a vgt turbo is better than this fix although they can require maintenance...

 

[Phil P]

It’s a bit of a misconception that the jd turbos are variable geometry, they are actually a variable nozzle turbo.
The actuator opens and closes the inlet vanes to the exhaust turbine in order to create back pressure in the exhaust manifold which creates enough pressure to force the exhaust gasses though the egr system back to the inlet manifold (if that makes sense!)
Hence when there’s an actuator fault it’s can literally shut the exhaust causing excess back pressure and stall the turbo which equals no power!

 

[Serup]

It’s a bit of a misconception that the jd turbos are variable geometry, they are actually a variable nozzle turbo.
The actuator opens and closes the inlet vanes to the exhaust turbine in order to create back pressure in the exhaust manifold which creates enough pressure to force the exhaust gasses though the egr system back to the inlet manifold (if that makes sense!)
Hence when there’s an actuator fault it’s can literally shut the exhaust causing excess back pressure and stall the turbo which equals no power!

So when the actuator stops working, it's possible to reprogram it to just be open all the time?
I have changed several of these vgt turbo's on 6068 engines (US 7030 tractors), because the actuator stops working. It's an expensive operation.

 

[Phil P]

So when the actuator stops working, it's possible to reprogram it to just be open all the time?
I have changed several of these vgt turbo's on 6068 engines (US 7030 tractors), because the actuator stops working. It's an expensive operation.

Possibly if you have the software to rewrite the ecu, you’d need to also program the egr to stay closed.
The ecu also monitors turbo speed among other things such as calculated air flow inlet temp exhaust gas temp etc, if any go out of tolerance you get codes and a derate situation.
All these would need reprograming to the correct poramiters to run properly and without damaging anything. I find it easier to just replace the turbo!

 

[Serup]

Possibly if you have the software to rewrite the ecu, you’d need to also program the egr to stay closed.
The ecu also monitors turbo speed among other things such as calculated air flow inlet temp exhaust gas temp etc, if any go out of tolerance you get codes and a derate situation.
All these would need reprograming to the correct poramiters to run properly and without damaging anything. I find it easier to just replace the turbo!

I have a tractor where we replaced the turbo at 2000, 4000, 6000 and 8000 hours. At 6000 we threw the egr cooler and valve in the bin, but it didn't help any.

 

[Farmer_Joe]

I have a tractor where we replaced the turbo at 2000, 4000, 6000 and 8000 hours. At 6000 we threw the egr cooler and valve in the bin, but it didn't help any.

then i believe you are best speaking to derv doctor, he has a none vgt turbo that can replace the original unit which is supposed to be much more reliable, i dont know the details try his website.

 

[Serup]

then i believe you are best speaking to derv doctor, he has a none vgt turbo that can replace the original unit which is supposed to be much more reliable, i dont know the details try his website.

I talked with him last time we changed it. His solution is only for the smaller mannheim tractors, and doesn't fit mine. If it did, it would have been on now.

 

[JohnDeere8530]

spoken to Derv Doctor, the solution is to scrap the JD turbo and fit a Borg Warner S20SX turbo, a new manifold and blanking for the egr valve. The ecu will need sending to them to do a egr delete etc. Hopefully then I should have a reliable engine

 

[fieldfarmer]

spoken to Derv Doctor, the solution is to scrap the JD turbo and fit a Borg Warner S20SX turbo, a new manifold and blanking for the egr valve. The ecu will need sending to them to do a egr delete etc. Hopefully then I should have a reliable engine

I dont regret putting the kit on one of mine, it seems a bit noisier than before though but very happy.