Hd7g injector pump filter in pump?

He sould't have a filter at bottom head, he has a line from fuel filter who connect to bottom pump injection head .

Try this

http://www.oldengine.org/members/diesel/Ambac/Fuel1.htm

I got back down home to my loader and changed the fuel filters, had a heck of a time getting this normally flawless-running machine started. I traced my problem to a sticky control sleeve in the injector pump head. With some manual manipulation of the linkage I managed to free it up and got it started. Worked perfectly again but then displayed a tendency to get sticky again. More working the linkage by hand and freed again. Next morning stuck again, freed it again and used the loader for 2 straight hours with flawless performance. I think there's still some varnish or gunk in there, hopefully with the clean fuel and a little fuel conditioner it will eventually stay free. THis problem started last year when the tractor had sat for a year or so. I started it up and it ran away full throttle. I hit the cutoff handle and it died, would not restart without a lot of cranking and cussing. Months later same thing but I finally got it started and it ran fine till last week. If I still have problems I'll remove this valve, etc. and clean/polish it. The shut-off cover removes with two screws and you can run the motor with it off and observe the operation of the valve. Once I determine if it's the little shaft and lever assy. sticking, or the actual sleeve/plunger mating surface, I'll service that area. There is a little info, mostly old, out there on this subject, but most of the people who have dealt with problem either won't share their knowledge or have passed away. Same way with the old airplane engines I deal with.  I'll soon know, and I will share it. I also feel that my fuel pressure is a little higher than I recall the norm being. Maybe I just never paid much attention as it was always in the green. 30 is in the green but at the top of it.  AC specifies a minimum of 8psi. Cheers from Missouri

Ian Beale wrote: We mobilised an AC forty Five that had sat for quite a while.  It would start OK then once brought back to idle would stall when you advanced the throttle. Diesel mech son eventually traced the problem to a tiny burr on the control shaft in to the control valve in the head.  When it got primary fuel pressure on it was when it locked up.  Took him about 8 hours to find. Might help your search. I;m go

Ian, I'm going to remove that control shaft next weekend and I hope it's just binding there. It was odd how it would bind and then suddenly free up as I cycled it by hand. I'm hoping the diesel treatment I added to the fuel will help work this loose over time. I was told by an old(er) timer that adding some 2 stroke oil to the mix would help compensate for the lack of sulfur (that lubricates pump and injectors) in this modern fuel. Cheers from Missouri

Edited by doctorcorey - 06 Aug 2017 at 8:54pm