HI guys This is my first post and am new to heavy equipment forums Iv got a Hitachi LX70 wheel loader that has a miss under throttle and cold startup it does not miss every time It has had new diesel filter and it had been run out of diesel recently but refilled and re-bleed if somebody can help solve the issue would be great it throws black smoke every time it misses. under load it is better and normally does not miss under full throttle Timing issue or injector or something more sinister ? Ill try an upload a video Cheers Nick
Hi Nick, welcome to HEF. As to your problem. Because it ran out of fuel in may have sucked up some gunk. Check the banjo fitting on the hose coming from the tank at the lift pump. Inside that fitting there is a strainer that may need cleaning. If your engine has got a lot of hrs on it the lift pump may need servicing( a job you can do yourself). It has nylon seats in it that get pitted. Replace them or as an alternative they can be sanded smooth but you need very fine paper and have to be absolutely flat across. I had the same problem on one of Buzz and Sam March's excavators many moons ago.
Hi Tones I checked the small strainer and found some gunk stuck in it , it ran half as good again , checked the lines before and after the banjo and found more gunk so cleanned them up and it seems to be almost flawless now As for servicing the pump , where are the nyon seats located just for future ref Thanks for your help