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If you have a bleeder valve on a filter or a sight bowl with valve where you can check your fuel for junk that has possibly gotten into the fuel system do it often for awhile.
from what I understand these pumps are not able to be rebuilt because no parts are available so a new injection pump has to be placed on the tractor. Now with that said. I do not know what engine you have but some have a oil line that supply's engine oil to the injector pump ,they do not have a captive oil reservoir. So if you was to have one of those your engine oil would be thin and smell like diesel also. I have read on this forum about people having a oil and fuel mixing problem with these pumps, usually the tractor runs ok but a fuel, oil mix comes out of the pump vent or is noticed when changing pump oil.
black smoke indicates a rich fuel condition or to little intake air and unless there has been engine work the timing would not change but I am wondering if the hydros are loading the engine, maybe you could pipe around your bucket control valves as a test? ,people have had issues with some controls valves sticking and creating a deadheading issue which is can take out the hydro pump . This has been covered in the past, take a look thru old chats maybe you will find something.
well mine is not designed like that the hydro oil is common sumped in the trans., rear end diff. and power steering. no separate collection tank. I think it is around 7 gal.
I sure will like to know what is doing this just as a curiosity ,I have a 2005 (Lenar)(DFAM) dong feng le204 that is common sump, knock on wood it has been very trouble free.
this is just a wild guess but could there be a plugged up vent that as the tractor heats and cools causes that vacuum or operating the lift?? and sucks by a worn seal? yes grasping at straws for a idea
if you tractor has a tach. make sure that when running wide open throttle you do not exceed you tractors engine max rpm. I guess that it is no big deal if you NEVER run it at max power.
I think that might be the governor ,no fool with must be set by diesel injector shop tech's.
