Kubota d722 from fixed to variable speed

[miller09]

Could some one tell me what i need to change a fixed speed d722 out of a generator to variable speed for a tractor? I changed the throttle arm to a variable speed and backed the screw out all the way and it still runs at 1700rpm. So then i adjusted the idle screw on the side of the pump with no change. I can speed it up with the lever or pump idle screw but no amount of adjustment will slow the idle down. Thanks for any help

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[North Idaho Wolfman]

I do believe you'll need to change the governor assembly in order to get it to be a variable speed engine.

But post a few pictures of the front, top, and rear around the injection pump.

 

[lugbolt]

Yes, governor assembly and the throttle plate assembly.

 

[miller09]

Ok just to clarify i have to remove the front cover to change out the governor assembly correct?

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[North Idaho Wolfman]

Ok just to clarify i have to remove the front cover to change out the governor assembly correct?

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Yes, that's where it's at.

 

[miller09]

Ok thanks. I ordered the governor assembly should be here in a few days i will update the results

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[miller09]

Ok just an update for anyone else wanting to do this. All you really need is 4 more weights for the governor/injection pump cam and the governor spring. Not sure if kubota sells the weights seperate or not but they look like ball bearings. I bought the complete governor assembly used and all other parts were identical. So i put the weights in my original fuel pump cam so i didn't have to reset the fuel pump timing. Changed the spring it was a different length Idles at 1100 rpm now. Thanks wolfman


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[Tooljunkie]

Looks like a victory to me. Feels great, dont it?
Glad its resolved.
Sean nailed it in short order.

 

[schenkski]

Hi, I am up against the same problem. Bought a generator D722 to put on my JD 420 garden tractor. Didn't realize the engine speed problem. Can you help me understand what needs to be done here to fix it. Do I need to replace all the governor under the timing cover? And what with?

 

[Russell King]

In my simple mind you need to take the complete governor from the old engine and swap it into the new engine.

That is assuming they are the same Kubota engine, just from different applications.

 

[North Idaho Wolfman]

You'll need to swap all of these parts


And all of these parts.

 

[schenkski]

In my simple mind you need to take the complete governor from the old engine and swap it into the new engine.

That is assuming they are the same Kubota engine, just from different applications.

Thank you for the info. Unfortunately, the tractor has a D600 and I Im not sure, but I dont think the governor stuff is the same. Thats the next question I guess is what type of machine do I source parts from. Do I just replace the (looks like) 6 bsll bearings?

 

[schenkski]

Thank you for the info. Unfortunately, the tractor has a D600 and I Im not sure, but I dont think the governor stuff is the same. Thats the next question I guess is what type of machine do I source parts from. Do I just replace the (looks like) 6 bsll bearings?

I found a guy with the fuel cam and governor linkages from a BX1850. How lucky after a ton of homework looking for a tractor with s D722. Thanks for the help. Hope it works well. I also saw a D600 supposed to be the same, but I sprang for the other.