Kubota L245F No Throttle Control High RPM at start up maybe governor?

Banochris · Sunday at 4:12 PM

Hey there folks, It's been a while and this old L245 has been running very well,, until recently.. and it may be something I messed up... grrr.

So it a few weeks back I was running the brush cutter (not a Bush Hog Brand) and doing some general work with the front end loader. Had been going at it for a few hours and out of the blue, throttle control was sporadic. It would drop to idle speed and I would have to push in the clutch to prevent killing it, pump the foot speed controller a few times till it became responsive again, then I could go a few more minutes and it began again. After a few cycles of this behavior, I figured it may be running hot, so I limped back to the shed and let her idle low a few minutes then shut her down. I waited a bit and checked the fuel level, coolant level, and oil level, and all where fine. I then pulled the fuel line off the injector pump to make sure fuel was flowing, and it was flowing very well. Then I pulled the injector fuel feed lines, opened the petcock and fuel rose up through the injector pump openings. I figured it may be the injector pump, so I went to work removing the pump and doing some research.

I found that most folks agreed, that if the pump was functional, and it's rare that injector pumps completely fail, that you should not try to rebuild it due to the complexity and cost. So I decided to replace the brass delivery valve gaskets, the delivery valve holder o-rings, intake manifold gasket, and an injector pump shim. Jumped on German Bliss and ordered the parts. Put everything back together, primed the fuel lines, and cranked her up. She started right up but was running wide open like the throttle was all the way open. The throttle lever had no affect and the little kill lever didn't shut it down, so I closed the petcock and it shut down. I figured I must have missed aligned the pin on the control rack to the slit on the governor fork lever. I think I'm using all the correct part names.. Took it all apart 3 times, double checked everything, and it looks correct. Put it back together and it still runs wide open with no throttle control.

I took off the little cover to see inside and the pin is in the slot. So now I'm just confused. Did I just not reassemble it correctly, or did I break or bend something with the governor? I'll go snap a few pics and post em. Maybe you guys can see something I missed.

Thank and sorry for the long post..

thepumpguysc · Sunday at 7:16 PM

Just see if the rack moves left and right..
If u have an electric shut off solenoid that screws into the left side of the inj pump “block” and u didn’t remove it FIRST.. now would be a good time to take it out and inspect it.. along with the inj pump rack..
It’s hard to tell from here if u sheared off a locating pin.. but it’s highly possible..
Just remember, after your done with the inspection, the rack should move VERY EASILY left and right..

Banochris · Monday at 8:43 PM

The rack moves freely left to right when I remove the IP.

thepumpguysc · Monday at 9:57 PM

It’s a process of elimination..
What’s your experience with building injection pumps.??
U HAVE TO MAKE SURE it’s in working order before reinstalling, otherwise it’s very possible that you’ll have the same outcome..

Banochris · Tuesday at 8:32 PM

Yea, most things seam to follow that logic.. lol.
I haven't rebuilt an injection pump but I just finished rebuilding the engine in my Mini Cooper R53, and it runs great. lol.

I found this video and it didn't scare me off.. lol.

I have a feeling that one of the rods that go up through the control sleeve and pushes the element, is stuck. But we'll see once I get the pump off. Also the 2 nuts on top of the governor shaft have bean sheered off, so I'll be having to take the Throttle Plate off and replace the shaft as well..

I will send you pics before I do anything though. And any advice or tips would be HUGE...