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Tractor Talk Discussion Forum

780 David Brown Starting Problem

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Greg in Canada

02-12-2005 13:13:47




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My neighbor is moving and has offered me his tractor, a David Brown 780 Selectomatic
serial 780/1/ 6069321/S. I went over today to atempt to start the tractor which has been sitting for around 2 years. Needless to say it would not fire. Being a diesel I began to check the fuel system. I am getting fuel up to the injector pump but not up to the injectors. My two questions are what year is the tractor and what might be causing the fuel problem. The injector pump was rebuilt prior to the tractor sitting. Thanks for any help

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crw

02-13-2005 19:59:07




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 Re: 780 David Brown Starting Problem in reply to Greg in Canada, 02-12-2005 13:13:47  
there should be a hand pump to pump fuel thur the injector pump back to the tank. after fuel is going back to tank, crack open lines at injectors. with the tractor sitting, injector pump could have locked up or pump shaft could have broke. my pump shaft was broke last year.



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Greg in Canada

02-14-2005 13:12:18




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 Re: 780 David Brown Starting Problem in reply to crw, 02-13-2005 19:59:07  
Thanks for all the advice. I did manage to get the tractor running. Had to bleed all of the injector lines and free up the throttle and fuel shut off controls.



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rod s

02-13-2005 06:52:53




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 Re: 780 David Brown Starting Problem in reply to Greg in Canada, 02-12-2005 13:13:47  
I would drail all fuel and flush lines and tank and pump first then with new fuel in and new filters also bleed at the filters then the pump then crack injector line open and whirl engine over till fuel drips from injector do this to all of them and it should start. I have the shop manual if you need it copied let me know.
regards
rod
David Brown 990



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RAB

02-13-2005 01:20:36




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 Re: 780 David Brown Starting Problem in reply to Greg in Canada, 02-12-2005 13:13:47  
First thing: Is the fuel shut-off completely free and in run-position at the pump?
Regards, RAB



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