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John Deere Tractors Discussion Forum
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Power problems

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AGR538

04-06-2004 15:04:16




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I know this isn't antique but my brother just bought a 8640 - 4WD. It has lost its power. Three weeks ago it pulled a field cultivator like it wasn't back there. Rain and other reasons kept him out of the field and when he hooked it to a 5 shank subsoiler it pulled the motor down. Put it on a disc that is pulled by a 4650 and pulled the motor down. Air and fuel filters are good. Pulled the pump to check the governors and they are good. Have not pulled turbo but it has not given any typical symptoms of being bad. We are stumped. Any advice would be appreciated.

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G-MAN

04-06-2004 16:30:14




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 Re: Power problems in reply to AGR538, 04-06-2004 15:04:16  
It could be a weak transfer pump or plugged sediment bowl screen at the transfer pump. You mentioned the fuel filters, but did you check the little screen in the bowl at the transfer pump? If that gets plugged enough, it will make for VERY low power or even kill the engine outright - had a 4630 do it just last week. Another possibility is that the steel line running from the intake manifold to the injection pump aneiroid control is broken, cracked or has leaking seals. The aneiroid controls fuel delivery based on boost pressure, so if the line is broken and not delivery boost pressure, you won't get full fuel. I'd start with the sediment bowl screen, then check for a broken aneiroid line, and then check transfer pump pressure at the fuel filter base. After checking the air filters and fuel filters, those are the next easiest checks to make and most common problem-causers. Another outside possibility is that the cam gear/fuel pump drive gear has slipped. However, if it starts alright, that's probably not it, and that's a rare failure - I've only seen it happen once. I'd still give the injection pump timing a look while I was there, though.

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