67 Case 430 lacks power.

[Travwm]

As always, thank you to the people at yesterday’s tractors for a great and helpful forum!
Next up is my 67 Case 430 Utility tractor. It lacks power and bogs down in 3rd gear. It didn’t use to do that- only in 4th high gear before this.
I would guess at about 3500 hours on it. Mostly doing little jobs around the neighborhood.
I had the injection pump serviced by a highly trusted source and I was very careful to time the pump to the engine.
The fuel system was fully cleaned and new filters installed. No improvement.
Any idea where I proceed from here?
Thanks again, Trav

 

[buickanddeere]

Has the tractor been dyno tested ?

 

[Travwm]

No, however, I can tell that it lacks power because it loses power just back blading a little dirt

 

[Case Nutty 1660]

As always, thank you to the people at yesterday’s tractors for a great and helpful forum!
Next up is my 67 Case 430 Utility tractor. It lacks power and bogs down in 3rd gear. It didn’t use to do that- only in 4th high gear before this.
I would guess at about 3500 hours on it. Mostly doing little jobs around the neighborhood.
I had the injection pump serviced by a highly trusted source and I was very careful to time the pump to the engine.
The fuel system was fully cleaned and new filters installed. No improvement.
Any idea where I proceed from here?
Thanks again, Trav

Is it smoking under load/when it loses power? if so light, dark Black ect,, trying to diagnosis a bit more