John deere 55 Combine problems

andy75 · 01-25-2012, 12:01 PM

My dad and I purchased a John Deere 55 square back combine 3 years ago. While running the combine, it would stall out. It acts like there is air bubbles in the fuel line not alowing it to get fuel. Once you let it sit for an hour or so it will start right up and will run for another hour or so. Any advise on what is causing this problem, and how can I fix it.

johndeere95 · 01-26-2012, 10:15 PM

Sounds like it could be the fuel pump or possably ignition problems.

Bruce Avison · 01-26-2012, 10:20 PM

Is there proper venting and flow back to the fuel tank, or is it forming a vacuum? Dad once saw a combine do that, wouldn't run for more tahn 15 minutes because the vacuum from a collapsed fuel line caused it to stall. Over time, the vacuum was released, and fuel flow was restored.

Bruce

rfruth45890 · 01-26-2012, 10:52 PM

Check your voltage at the fuel pump when it shuts down and maybe see if it is still pumping fuel when its hot. You may have a bad fuel pump that is shorting out internally. If no voltage chek your feed from the ignition switch.

medicineman · 01-26-2012, 11:33 PM

or perhaps it is a bad coil. As the coil warms up voltage will break down and it will act like a carb problem. Do you have a picture of your 55. I have a 65 pull type , do they look alike?

andy75 · 01-27-2012, 12:55 AM

Medicineman
I can get a picture for you tomarrow.

andy75 · 01-27-2012, 12:59 AM

It only quits when its in the field for about 3 hours.

Ackerman Farms · 01-27-2012, 01:00 AM

What about vapor lock?

andy75 · 01-27-2012, 11:51 AM

thats what i thought it was too. But how do i fix it?

medicineman · 01-27-2012, 09:54 PM

Vapor lock occurs when fuel in the fuel line "boils so to speak" somewhere in the fuel line usually between the pump and the fuel tank. The causes can vary from overly warm fuel which can quickly turn to vapor in the fuel line when the fuel pump applies a vacuum to the intake line which causes the fuel to instantly vaporize and therefore the pump quits pumping or perhaps the vent on the fuel cap is plugged or maybe someone changed the cap to a none vented cap which will lead to a vacuum in the fuel tank which in about 3 hrs could become quite severe to the point of stopping fuel flow by once again causing the fuel to flash to a vapor in the line leading to the pump from the tank.
I would check the fuel cap for proper venting. I doubt that fuel temperature is the cause in this case as there is no return of fuel from the carb to the tank. I suppose another cause could be some junk in the tank plugging the outlet leading to the same problem.

01-25-2012, 12:01 PM	#1 (permalink)
andy75 Junior Member Join Date: Jan 2012 Posts: 4	John deere 55 Combine problems My dad and I purchased a John Deere 55 square back combine 3 years ago. While running the combine, it would stall out. It acts like there is air bubbles in the fuel line not alowing it to get fuel. Once you let it sit for an hour or so it will start right up and will run for another hour or so. Any advise on what is causing this problem, and how can I fix it.

01-26-2012, 10:20 PM	#3 (permalink)
Bruce Avison Senior Member Join Date: Apr 2010 Posts: 1,837	Is there proper venting and flow back to the fuel tank, or is it forming a vacuum? Dad once saw a combine do that, wouldn't run for more tahn 15 minutes because the vacuum from a collapsed fuel line caused it to stall. Over time, the vacuum was released, and fuel flow was restored. Bruce __________________ And on the 8th day, God looked down on his planned paradise, and said "I need a caretaker." So God made a farmer.

01-26-2012, 10:15 PM	#2 (permalink)
johndeere95 Member Join Date: Oct 2011 Location: manitoba Posts: 59	Sounds like it could be the fuel pump or possably ignition problems.

01-26-2012, 10:52 PM	#4 (permalink)
rfruth45890 Junior Member Join Date: Nov 2010 Posts: 16	Check your voltage at the fuel pump when it shuts down and maybe see if it is still pumping fuel when its hot. You may have a bad fuel pump that is shorting out internally. If no voltage chek your feed from the ignition switch.

01-26-2012, 11:33 PM	#5 (permalink)
medicineman Senior Member Join Date: Mar 2009 Posts: 262	or perhaps it is a bad coil. As the coil warms up voltage will break down and it will act like a carb problem. Do you have a picture of your 55. I have a 65 pull type , do they look alike?

01-27-2012, 12:55 AM	#6 (permalink)
andy75 Junior Member Join Date: Jan 2012 Posts: 4	Medicineman I can get a picture for you tomarrow.

01-27-2012, 12:59 AM	#7 (permalink)
andy75 Junior Member Join Date: Jan 2012 Posts: 4	It only quits when its in the field for about 3 hours.

01-27-2012, 01:00 AM	#8 (permalink)
Ackerman Farms Member Join Date: Dec 2011 Location: NC Ohio Posts: 41	What about vapor lock?

01-27-2012, 11:51 AM	#9 (permalink)
andy75 Junior Member Join Date: Jan 2012 Posts: 4	thats what i thought it was too. But how do i fix it?

01-27-2012, 09:54 PM	#10 (permalink)
medicineman Senior Member Join Date: Mar 2009 Posts: 262	Vapor lock occurs when fuel in the fuel line "boils so to speak" somewhere in the fuel line usually between the pump and the fuel tank. The causes can vary from overly warm fuel which can quickly turn to vapor in the fuel line when the fuel pump applies a vacuum to the intake line which causes the fuel to instantly vaporize and therefore the pump quits pumping or perhaps the vent on the fuel cap is plugged or maybe someone changed the cap to a none vented cap which will lead to a vacuum in the fuel tank which in about 3 hrs could become quite severe to the point of stopping fuel flow by once again causing the fuel to flash to a vapor in the line leading to the pump from the tank. I would check the fuel cap for proper venting. I doubt that fuel temperature is the cause in this case as there is no return of fuel from the carb to the tank. I suppose another cause could be some junk in the tank plugging the outlet leading to the same problem.

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