John Deere 6600 combine, engine dies

farmboy48

Member
Hi guys, don't spend much time on this forum, but my John Deere 6600 combine with diesel engine is giving me fits. She starts and runs fine for from 20 seconds to 2 minutes, and then slows down and dies. Happened about 15 times today as I was starting on my beans. Finally got it back in the yard and cleaned sediment bowl under the tank, and replaced the fuel filter on the engine. I have fuel flow to the injector pump from the electric pump, could it perhaps be a problem with the mechanical pump on the engine not giving enough pressure to the injector pump. The old girl has been working flawlessly for the last 25 years, Any ideas?

Thanks,

Dick ND
 
Did you check the flow from the sediment bowl while you were cleaning it? Might have to pull the whole assembly out to clean the inlet. Also how does the vent on the tank look? Just trying to help. chris
 
yep, good flow out of sediment bowl outlet, vent seems ok, even tried it with fuel cap off to eliminate possible vacuum in tank. Electric pump filled new filter in less than ten seconds. I was advised to check return line check valve for rubber bits from dampening ring in injector pump, will check that when sun comes up.

Dick ND
 
Put a catch can under the injection pump and loosen the two screw timing cover on the side so fuel can leak out. Start the engine, if it runs WITH the fuel leak, but DIES with the cover tight the injection pump needs repair. Just repaired a 3020 and 4010 pumps for the same trouble. Best to repair it soon or there's a chance of head seizure, and pump drive shaft breaking.
 
Different pump, that is not likely the problem,,,, Matthies is closer to where the problem is,,at the fuel bowl,,seen this many times back in the old days, along with the electric fuel pump failing...
 
Had similar issues on a 6600 GAS ....old boy had fought it for year or two, he had rebuilt the carb, swapped govenors,
put a couple of electric pumps on it, no improvement. When I got to it it would run if you didn't engage the seperator.
I found a weak stream of fuel to the carb, pulled the bowl off the bottom of the tank, got a weak dribble. Pulled the
bowl assembly out of the tank found the standpipe packed with ladybugs, had to drill the carcasses out of the standpipe.
Old boy could not believe the ladybugs could get in the tank. The combine was the only gas engine on the farm. I grabbed
a clean bucket, went to his supply tank and shot some fuel into the bucket. You could not see the bottom of the bucket
for ladybugs.
 
In agreement with tank debris angle, sounds like some leaves floating about causing intermittent and absolute fuel shut off when they come across the outlet inside the tank. Rolled up screen inserted from below is one easy fix but would be done with an empty tank.
 
Years ago my Dad left the fuel cap off of our 6620,,that haunted us for a long time,corn silk would plug the screen that went up through the outlet opening and even plug the opening down through the shut off valve,, we carried a pipe plug in the ash tray to plug the opening when we would drop the fitting down out,,and yes what a mess that would make. One morning at about 3AM my brother and I was almost done running corn on frozen ground when the engine started to wind down..we knew just what was happening,,so there we were about 10 below zero pulling our coveralls back to deal with it....
 
thanks for the help guys, looks like the pump is dying, gonna take it to repair shop in the morning, they guesstimate about 600 bucks to overhaul. Not too bad a price if they get it right.

Dick ND
 

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