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If it ends up being a bad pump figure out why it dead headed and blew out the seal. There are many threads on this issue. Plumbing a pressure gauge in even on a temp basis will help.
what does the engine oil look like has it combined with diesel, hydro oil or water? was it running at a normal temp. before it quit? was your oil pressure good enough?Was the head retorqued after 50 hrs. or so?
I do not know exactly where it is but have you checked the flow control valve it should be a round hand wheel near or underneath the seat, it should be open some and closed down depending on how much weight the arms have on them to control downward hydro. flow from the cylinders back in the sump. I believe I got that right.
If you are not familiar with diesel injection systems find a mech. I would not start it as 3000 rpm it could go bang, clank and quiet and possibly hurt you, run away condition not good . but I think you need a injector pump. I do not believe anyone rebuilds them here. And most likely a oil change too. Others will crime in.
the valve control body there was a guy who just found a loose screw in a joystick valve ,his problem was a slow movement but the idea of the problem is the same a restriction of flow . search on this site you should be able to find it.
a pressure gauge should tell you , could your system be dead heading and causing it to blow out something the system? what did you find wrong with it when you had trouble before?
do the simple stuff first make sure all your connections are good and clean and double check the grounds
