Attention: TDR Forum Junkies 
I spoke with a tech an the local John Deere dealership today about our lift pump problems.
Deere makes a 12V lift pump for the 9600 combine. It is about as big as a pop can (slightly smaller) and has pressure from 6psi - 50psi. Thats what the book said. He didn't know how it adjusts that pressure, except that it may be varying voltage based upon engine load and rpm. Maybe its the Deere computer control. But thats a good thing maybe considering Dodges duty cycle voltage variance.
The fuel tank on these machines is much lower than the engine so Deere had to use one. He said they were very reliable and had only ever replaced one because it had a drip leak. He kept it and uses it to transfer fluids in the shop area still. He said the owner just didn't like the occasional drip from it.
It sounds like a possibility. I would test 12V constant voltage and see what pressure it produces. Then, if its high (which I suspect it would be) then it could be regulated. He also didn't know about the volume but believed it should be decent since these engines have decent HP.
Its only $70 so I might order one and bench test it for pressure and flow. It may not work but could be worth researching more. If its regulated, and lasts for a long time, who knows, maybe it will cure the problems.
Deere makes a 12V lift pump for the 9600 combine. It is about as big as a pop can (slightly smaller) and has pressure from 6psi - 50psi. Thats what the book said. He didn't know how it adjusts that pressure, except that it may be varying voltage based upon engine load and rpm. Maybe its the Deere computer control. But thats a good thing maybe considering Dodges duty cycle voltage variance.
The fuel tank on these machines is much lower than the engine so Deere had to use one. He said they were very reliable and had only ever replaced one because it had a drip leak. He kept it and uses it to transfer fluids in the shop area still. He said the owner just didn't like the occasional drip from it.
It sounds like a possibility. I would test 12V constant voltage and see what pressure it produces. Then, if its high (which I suspect it would be) then it could be regulated. He also didn't know about the volume but believed it should be decent since these engines have decent HP.
Its only $70 so I might order one and bench test it for pressure and flow. It may not work but could be worth researching more. If its regulated, and lasts for a long time, who knows, maybe it will cure the problems.
