JD620 gasoline - Gasoline tube vent installation

Ron Fargen · Jun 2, 2014

My JD620 gasoline siphons gas out around the filler cap and down the hood if there is just 5 gallons in the tank. I have a new filler cap and added extra gaskets and problem still exists. The parts manual lists part number AA5796R(Vent tube), A5161R(Vent tube drain)and A5171R(Vent Tube extension). My question is that what I need and if so, how are the parts installed. The installation isn't evident to me by looking at the parts manual picture. Thanks.

58 Deere · Jun 5, 2014

My 620 did the same thing. One summer baling hay I smelled gas and felt gas as it was spraying on my arm. Stopped using the 620. I checked into it and found a small hole drilled through the gas cap. I am guessing a "vent" from the previous owner. I used compressed air and blew through the tank vent. Small tube at bottom of radiator. Puff of dust later I was sure I had it fixed. With the gas cap off I could feel air from the top of the tank while blowing in the vent . I put a screw in the cap to fix the hole. Finished baling. New cap with vent now. Cap leaks a little gas. Two gaskets and it still seeps a little. Tank vent is open. New cap with vent. Gas tank heat shield in place. Like you said only about five gallons or so of gas. I think I will replace one of the rubber gaskets with cork and run two cork gaskets. That should make the cap tight.

JD620 gasoline - Gasoline tube vent installation

Ron Fargen

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58 Deere

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