Posted by andy r on December 03, 2014 at 19:19:56 from (75.91.149.15):
I am still having problems with my combine. For new readers my JD 6620 combine will run for 2 to 3 minutes and then will struggle and die. Not even trying to run the thresher, just move it. Before it dies it will loose power, but continue to run with reduced load. Combine ran perfect through bean harvest under full load. Right rear wheel dropped into a tile hole so it sat in the field while I used another combine to finish. Warmed up last week so I temporarily put the axle back on and was going to run it to the farmstead. In attempting to move it is where I run into the engine problems.
UPDATE - I have changed the two fuel filters. Checked the tank sediment bulb. Checked the injection pump sediment bulb. Fuel has winter additives from supplier. With sediment bulb loose it will run a constant stream - it filled a five gallon bucket half full in a 2 to 3 minutes. Have opened the tank filler cap to check for vacume. With sediment bulb off of the injection pump and the key switch turned on fuel runs out of the sediment bulb housing on the injection pump. Hand pump on injection pump works and will push fuel into the fuel filters forcing air out. Can't seem to get all of the air out - just a little at the top center of the filters. Some one mentioned that the right side countershaft bearing may have went bad and has worn the fuel pipe - no, can slide a finger inbetween the pipe and shaft - also no visable fuel soaked spots on side of machine/no drips.
NEW INFORMATION - a couple of times when the engine has quit or I have pulled the fuel shut off knob and I have walked around the combine near the fuel tank, I could hear diesel apparently running (gurgling/bubbling) back into the fuel tank from the engine compartment I would assume. Should the fuel run back?? Can't really remember hearing that before. I don't think there is a return line from the injection pump.
When the engine is running and you are standing in front of the engine with your head looking over it you can see a stream of tiny bubbles in the fuel flow into the bottom of the glass fuel filter nearest the injection pump.
Just seems like the fuel filter somewhat empties out. Maybe the one I see the stream of tiny bubbles in empties the worst. What should I do next??? I am willing to go back to check things I already have if you feel necessary. Thanks.
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