d950 governor springs?

[yames]

hi I'm new here but have read a bunch of posts on my venture to repair this machine, I have a d950 in an older excavator and have completely went through the fuel system after the previous owner ran water through it and let it sit.
it runs now but won't rev over 2400rpm and dies after you put it under load, I can rev it up manually to any rpm on demand through the side cover plate no problem so I'm thinking maybe some springs on the governor are gone or broken maybe stretched but I'm not sure exactly, everything fuel related is new, it's for sure not a fuel restriction I have ran it from an auxilary tank with the same issue and fuel is clean.
I'll post some photos looking in through that cover but I don't know if anything is missing, i havent pulled the top throttle lever plate yet to see what may be missing under there.

 

[North Idaho Wolfman]

Yes it looks like your missing a spring.
It's a small spring that fits inside the larger spring.

 

[yames]

Yes it looks like your missing a spring.
It's a small spring that fits inside the larger spring.

View attachment 139236

I suspected as much but I'm finding conflicting information, the diagram from kubota for this machine only shows a single spring there for some reason and it happens to be discontinued, do you think it would be ok to run the tractor spring setup? im not sure what the difference would be.

 

[North Idaho Wolfman]

Since it was original with one spring then it should run with one spring.

Have you done a compression test?
Does it have new injectors and if so where did you get them?
Did you rebuild the injection pump or have it done?

 

[yames]

Since it was original with one spring then it should run with one spring.

Have you done a compression test?
Does it have new injectors and if so where did you get them?
Did you rebuild the injection pump or have it done?

yes, I bought all the parts from messicks, rebuilt the injection pump completely and replaced the injectors with new ones, went through the tank cleaned it out, it was rusted, i coated it on the inside after, i replaced all the filters and fuel hoses, oil changed.
I don't currently have a tester to check compression on a diesel engine.
it was running fine for a while after everything was done, I may have ran 2 tanks of fuel with no problems but has steadily gotten worse until now it just dies under load, won't rev over 2400 and its slow to respond to throttle.
being able to rev it at the injection pump rod manually is why I thought it might be an issue with the governor.

 

[North Idaho Wolfman]

yes, I bought all the parts from messicks, rebuilt the injection pump completely and replaced the injectors with new ones, went through the tank cleaned it out, it was rusted, i coated it on the inside after, i replaced all the filters and fuel hoses, oil changed.
I don't currently have a tester to check compression on a diesel engine.
it was running fine for a while after everything was done, I may have ran 2 tanks of fuel with no problems but has steadily gotten worse until now it just dies under load, won't rev over 2400 and its slow to respond to throttle.
being able to rev it at the injection pump rod manually is why I thought it might be an issue with the governor.

It's never an issue with the governor, they are virtually indestructible.
Bottle feed the injection pump directly, if your problem disappears then you have a fuel delivery issue.
If you still have a problem then either the pump is bad or the injectors are bad.
I lean towards the injectors.
did you get the injectors from messicks?
And I'll bet they were not OEM injectors.
There has been a rash of bad injectors through many different suppliers.
Another possibility is the valves are too tight, have you set the lash on them?

 

[yames]

It's never an issue with the governor, they are virtually indestructible.
Bottle feed the injection pump directly, if your problem disappears then you have a fuel delivery issue.
If you still have a problem then either the pump is bad or the injectors are bad.
I lean towards the injectors.
did you get the injectors from messicks?
And I'll bet they were not OEM injectors.
There has been a rash of bad injectors through many different suppliers.
Another possibility is the valves are too tight, have you set the lash on them?

good deal, I'll try tackling everything this week, I did get the injectors from messicks but I suppose I can check the spray out of the head, i do also have a spare set that i was told was new but i didn't beleive him, i could try or check those also i guess.
I have not checked the valve lash yet.
i really appreciate the help, I'll be back with my findings after or if i figure it out.

 

[yames]

just wanted to leave an update incase someone else finds this post, checked everything and found no issues, picked up a diesel compression tester set and it ended up being down on compression around 250-275psi, pulled the head and it's got a good bit of cylinder wear and piston play.
having it rebuilt over the winter