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John Deere Tractors Discussion Forum
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720 diesel

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BEL@IN

08-19-2007 14:27:33




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Seems as of late when my 720 sits for a while it will get air in the injection system and will have to be bled. Any ideas where this air is coming from? Any comments are appreciated.




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730virgil

08-19-2007 15:15:32




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 Re: 720 diesel in reply to BEL@IN, 08-19-2007 14:27:33  
i had the same trouble with my 730 diesel. i fianlly drained the fuel tank and took sediment bowel off and used indian head gasket shellac on the threads of brass fitting that goes in bottom of tank. it always dripped fuel when tractor was shut off so i had to turn of fuel when tractor wasn't being used. that took care of needing to bleed it ever time i used the tractor. now if i could stop leak in fuel pump to injection pump i would be a happy camper. when tractor is running i get diesel fuel coming out of back side of fuel pump. i think fuel is coming between shaft and seal. how do i stop it?

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BEL@IN

08-19-2007 15:42:37




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 Re: 720 diesel in reply to 730virgil, 08-19-2007 15:15:32  
Virgil, I have had the transfer pump leaking also, and it is not too bad to replace the two seals on the shaft. One faces the engine and one faces the pump. If your pump has a drain hole don`t drive the seal in so far you block the hole, its on bottom of pump close to the engine. Seals are available from JD or any bearing house.



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730virgil

08-19-2007 20:10:37




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 Re: 720 diesel in reply to BEL@IN, 08-19-2007 15:42:37  
did you do anything else when you replaced the seals? i've replaced them twice and still have them leaking.



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BEL@IN

08-20-2007 01:31:11




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 Re: 720 diesel in reply to 730virgil, 08-19-2007 20:10:37  
Virgil, Unfortunaly replacing the seals didn`t fully correct the leaking for me either, but helped. I still shut off the fuel and put a 5 gallon bucket over the throttle to remind me. I still get fuel in the crankcase.



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730virgil

08-20-2007 16:58:07




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 Re: 720 diesel in reply to BEL@IN, 08-20-2007 01:31:11  
i think replacing the seals made it worse either that or more fuel was getting into crank case than i knew.



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