Kubota d1105t governor issues

[North Idaho Wolfman]

I loosened the three "tamper proof" torx bolts that hold the barrels in place (on the top of the injection pump) and rotated them clockwise. There is just a few degrees of adjustment.

That's what I thought,
You didn't turn the barrels, you just adjusted the curve of the pump by turning the delivery valves, HUGE difference!
In order to turn the barrels you would need to remove the IP and disassemble the pump then turn the barrels which are on the inside of the pump connected to the rack.
What you did still throws the Injection pump out of whack, because now it's just not delivering the fuel it needs to at anytime, you've essentially cut the flow of fuel to all the injectors.
That adjustment is for balancing the pump so all outputs are the same.

Get the pump Professionally rebuilt, so you can eliminate it form the equation issue.

There is a reason that they put Anti Tamper Tork Screws on them!

I attached a linkage to the manual fuel shutoff lever on the IP and adjusted the stop to restrict fuel but not completely shut fuel off at idle. When going downhill and over-revving happens the machine will slow to normal when I pull the fuel shutoff lever. This leads me to believe the over-revving is a governor/IP issue.

What stop did you adjust?
Where is it located?

 

[Jim Leap]

That's what I thought,
You didn't turn the barrels, you just adjusted the curve of the pump by turning the delivery valves, HUGE difference!
In order to turn the barrels you would need to remove the IP and disassemble the pump then turn the barrels which are on the inside of the pump connected to the rack.
What you did still throws the Injection pump out of whack, because now it's just not delivering the fuel it needs to at anytime, you've essentially cut the flow of fuel to all the injectors.
That adjustment is for balancing the pump so all outputs are the same.

Get the pump Professionally rebuilt, so you can eliminate it form the equation issue.

There is a reason that they put Anti Tamper Tork Screws on them!



What stop did you adjust?
Where is it located?

I adjusted the stop that is part of the manual fuel shutoff on the IP. I screwed it out far enough that it would restrict fuel but not fully shut off the fuel. I think, as you advised, my next step is to have the IP professionally rebuilt. Then, as you say, that will eliminate the IP as a potential cause of the revving issue. I hate to go to such an extreme ($) but don't know what else could be causing the revving. The fuel flow reduction that resulted from turning the delivery valves definitely stopped the revving on level ground but the issue is still not completely resolved based on the fact that it is acting similarly when the engine gets "pushed" driving down a steep slope. Thanks for your generous support with this issue.

 

[Dieseldonato]

You have a govenor issue. The fuel shut off manually moves the rack to it stop position. The govoner in generators and tractors are the same. As a matter of fact the d1105 is rated for 3600 rpm in gen set applications. This is adjusted with the same fuel lever that we use for a variable throttle. The same shut down lever is what is used to stop the engine. The govenor is what keep the rpm consistent. If there is an issue with it the rpm can go all over the place. You pretty much need to take it apart and see what's wrong with the govenor.

 

[Jim Leap]

I adjusted the stop that is part of the manual fuel shutoff on the IP. I screwed it out far enough that it would restrict fuel but not fully shut off the fuel. I think, as you advised, my next step is to have the IP professionally rebuilt. Then, as you say, that will eliminate the IP as a potential cause of the revving issue. I hate to go to such an extreme ($) but don't know what else could be causing the revving. The fuel flow reduction that resulted from turning the delivery valves definitely stopped the revving on level ground but the issue is still not completely resolved based on the fact that it is acting similarly when the engine gets "pushed" driving down a steep slope. Thanks for your generous support with this issue.

In looking at the Kubota Workshop Manual page S 93, a diagram shows a "fuel limit bolt" that affects the movement of governor fork lever #2. Anyone have any experience with changing adjustments on this bolt? Since I had success "limiting" fuel by turning the fuel delivery valves I can't help but wonder what effect this "fuel limit" bolt has on the operation of the governor. Any thoughts or advise would be greatly appreciated.