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Jd 730 diesel

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Paul

05-19-2002 20:05:26




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I have a 730 diesel that i got 2 years ago.. had a cracked block . its basically a restoration project. but i'm still having some problems. i know its a really fussy machine when getting it into right timing when trying to make it run right. first when we started it up the first time.. it smoked, knocked and started hard, and didnt have any horse power. . so we checked the valves and timing. nothings wrong. so we took it to some guy and he found the injectors were dirty. we brought it back.. it started better, smoked alot less and had alot more power.... but it still knocks, it actually knockcs more. i dont know what to do about it. we just over hauled the whole engine. does the pump coming off the tank to the filters have to have pressure. cause that kinda just flows a little. not really has pressure. we dont know what else to do.. i just want the damn thing fixed cause it doesnt make money sitting. is there something else to check. like cam shaft or something? any suggestions would be awesome. thanks. paul

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DON IN ILLINOIS

05-20-2002 08:30:08




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 Re: jd 730 diesel in reply to Paul, 05-19-2002 20:05:26  
Paul, on the return line from the pumps there is a fitting that is a return valve.Install a pressure gauge to the second stage filter bleed screw. Should have 65 psi.at WOT.If the pressure is not there take the return valve apart and clean and add a shim under the spring.If you cant raise the pressure a new transfer pump is probably in order. A fresh overhaul on a 730 diesel knocks pretty loud but be sure it is only diesel knock. Hope this helps DON

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Blksmok

05-20-2002 06:45:36




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 Re: jd 730 diesel in reply to Paul, 05-19-2002 20:05:26  
Paul....Are you sure the flywheel is tight and not the source of the knock? I had a 720 diesel with similar behavior and I had an experienced JD mechanic listen to it. He said "they're all noisy like that, especially the 720 and 730's". I eventually found out the flywheel was loose even though it had a taper-lock flywheel. The hub was tight on the crankshaft but the flywheel was loose on the hub.

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