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574, the one hour tractor HELP

B

Bill Allis

Member
Put my "new" old tractor (574 diesel) to work today. Plowed for about an hour and it just quit, like I turned the fuel off. Had fuel at the filters. Wasn't sure what to unscrew at the injector pump, so went to see my IH mechanic. Since the previous owner had blown out the fuel lines, he suggested the filters were plugged. Before installing I checked the banjo fitting on the pump and had fuel. Tractor started and I finished plowing. Installed the new filters and started out again. In about one hour the tractor started to miss and backfire and quit again. With ether I got it started and nursed it home, all down hill. Any ideas??

Already ordered a new PTO clutch, this is beginning to look like an expensive learning experience.
 
Hi Bill, suspect jumk in the bottom of the fuel tanks. A test is use a clean bucket and disconnect the fuel line at the inlet to the first fuel filter and let it flow into the bucket. The flow should be the full of the pipe for at least 5 minutes. The other problem could a semi floating piece of jump in the fuel tank. My brother had a dead lady bug floating in the fuel tank of his 684 and it acted the same. Had to pull the fuel lines out of the bottom of both sides of the tank and drain tank into bucket.
Another thought, when it stalls remove the fuel tank filler cap and listen for in rush of air. If there is an in rush of air then check the tank breather.

To bleed the fuel system loosen the bleed screw on top of the primary fuel filter and let fuel flow until no air bubbles are present, repeat for secondary fuel filter, then for the injection pump, loosen one of the injector lines at the rear of the pump, slightly pressurize the fuel tank then start crank the engine with the STOP/START/RUN lever on the START position.
BECAREFULL WITH THE HIGH PRESSURE DIESEL FUEL FROM THE INJECTION PUMP.

Hope this helps
JimB
 
Jim,

Thanks for the reply. My next move was draining the fuel tanks. I am gong to check the tank cap. It would take about an hour for a vacuum to build enough to slow or stop the fuel. The first time it just died but the second time it smoked and missed and backfired, like extra air. I sure hope it is just fuel.
 
Diesels cannot backfire, and cannot get "extra air." Diesels run wide open all the time. RPM is controlled by how much fuel the injection pump puts into the cylinders.

They could get starved of air from a clogged air filter, but it would have to be REALLY clogged...

Just FYI so you're not chasing after gremlins that don't exist.
 
Hi, I believe what you are hearing is the following:
Engine is starved for fuel and RPM decreases, gouvener opens to full throttle to compensate for decrease in RPM, some fuel gets to injection pump engine speeds up to full throttle then gouvener again corrects engine RPM downward.

This is how my brothers 684 was acting one day when I was disking and the carcus of a lady bug was floating around in the fuel tank.

JimB
 
I drained the fuel tanks and removed all the stand pipes. Put it all back together and it started and seemed to run all right. Will test tomorrow. I did not find anything major in the fuel, I strained it all, a little dirt but nothing big.

I swear there is a little guy living in all my equipment that hates me, maybe I scared him!
 
thoes tractors can be a real problem with fuel . first every where there is a elbow like at fuel tank trash plugs them. next at filter where the line enters the filters check there, then at the bang fitting where the line comes off the filter it goes behind the filters . that line can calasp and reduce fuel flow to the pump. also at pump line that pervide the fuel bang fitting front of pump can be pluged what i do when one of thie tractor does as your does i statr at pump working back tell i find plug it can take some time but well worth it.
 
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