ok so I'm looking for suggestions on where to start looking on my backhoe.
FWIW- machine is a 2606 industrial model with a loader and a backhoe. has the D236 diesel engine in it

Made a post last week about looking for glow plugs. got them installed on Saturday and now its back to starting fine.
One thing I noticed- I was digging out a massive stump with the backhoe, and if I "strained" the hydraulics and the governor kicked in, when the released the pressure, the engine would return to normal but then it would start to lope. Sometimes it would recover on its own, sometimes it sounded like it was getting worse, and if I revved the engine a bit it would go away.

my first thought is injector issues? we really don't know any history of the machine, got it in 2010 for cheap, but needed an injection pump. We put a new to us pump on off a parts machine. Machine has always smoked pretty good, I just assumed worn rings. but for as little as we use it, I can live with the smoke.
Are injectors available for these engines? or could I pull them and have them checked/rebuilt?

Hi, usually when a Diesel engine starts loping then the first thing is to change the fuel filters and check fuel line for flow from the tank to the injection pump.

JimB

What you describe sounds like the retainer ring inside the injection pump is failing, I have the same model pump from a Case loader in for repair now doing the same thing. Probably needs repaired soon, before the retainer pins shear off, when that happens pump will be wrecked for good and the drive shaft will be broken.