This might get a bit long but I want to include all of the details.
Kobelco SK200Lc Mark IV. 5.9 Cummins. A couple hundred hours ago the engine started to surge at low idle. If I bumped up the rpm's a couple hundred revs it would be fine. It seemed to be worse when it was cold or when I first started it up. It had good power and no other issues. All new filters and some fuel additive but it still surges at very low idle. New fuel shut-off solenoid about 700 hours ago.
Now within the last 50 or so hours it has been loosing power while digging. It gets worse after 20 minutes or so and continues downward. It seems worse while using multiple functions but the biggest one I notice is operating the stick but that may be from increased hydraulic load. It got to the point when I had an inexperienced operator on there loading clay, he could kill the engine if not careful so I took it out of service.
I put on a new lift pump and all new lines. I just pulled the injector pump and brought it to a reputable shop. He didn't find anything wrong yet but he still has to run it on his bench today.
I don't think it's related but he only other issue I had is 2-3 times in the last few hundred hours is the machine would run out of fuel and almost die. I am 99% sure it was from some blockage in the tank because there was no flow until I blew back into the tank then it would be fine.
No smoke, clean fuel and air filters. I'm starting to think I'm chasing the wrong issue. Could I be having hydraulic issues that are causing the engine to be overloaded? The cooling capacity on this machine has always been borderline but I notched that up to poor design of the oil and coolant radiators. It's fine if everything is kept very clean. Any debris and temps over 90* and I have to keep an eye on it.
Thank you for any advice.
Twisted.
Kobelco SK200Lc Mark IV. 5.9 Cummins. A couple hundred hours ago the engine started to surge at low idle. If I bumped up the rpm's a couple hundred revs it would be fine. It seemed to be worse when it was cold or when I first started it up. It had good power and no other issues. All new filters and some fuel additive but it still surges at very low idle. New fuel shut-off solenoid about 700 hours ago.
Now within the last 50 or so hours it has been loosing power while digging. It gets worse after 20 minutes or so and continues downward. It seems worse while using multiple functions but the biggest one I notice is operating the stick but that may be from increased hydraulic load. It got to the point when I had an inexperienced operator on there loading clay, he could kill the engine if not careful so I took it out of service.
I put on a new lift pump and all new lines. I just pulled the injector pump and brought it to a reputable shop. He didn't find anything wrong yet but he still has to run it on his bench today.
I don't think it's related but he only other issue I had is 2-3 times in the last few hundred hours is the machine would run out of fuel and almost die. I am 99% sure it was from some blockage in the tank because there was no flow until I blew back into the tank then it would be fine.
No smoke, clean fuel and air filters. I'm starting to think I'm chasing the wrong issue. Could I be having hydraulic issues that are causing the engine to be overloaded? The cooling capacity on this machine has always been borderline but I notched that up to poor design of the oil and coolant radiators. It's fine if everything is kept very clean. Any debris and temps over 90* and I have to keep an eye on it.
Thank you for any advice.
Twisted.