Governor?

Hi all!
I have an MF40/135 tractor. It is the 3 cyl Perkins gas engine. I just rebuilt the carb, installed some new jets, and the timing is done to spec. In neutral, it idles great and I can take it to about 2200-
2300 RPM which is what spec said it should be when at 27 degrees before TDC. When I put it into gear and then release the clutch it bogs down. If I am on flat, and throttle up, the RPM will eventually move
up. If I am trying to go uphill, it loses power and drops down to sub 500 rpm. I put the brakes on, push in the clutch, the RPMs climb and then it will go forward a bit and drop back down to under 500.

When parked and in neutral, I brought the throttle up and watched the governor. The governor moves towards the radiator. However, when running and under load, the governor doesn't appear to be moving around
in relation to the RPM/load issues.

New plugs, wires, coil, alternator, and starter rebuilt. A little blow by coming out of the valve cover vent, but nothing to scream about. Does this sound like a governor issue or is the engine still not
getting enough gas from the carb or something else?

I disconnected the governor linkage and it is not moving at all when I increase and decrease the RPMs.

yay.

Easy to check the function of the governor.

Reconnect it.

Engine off, dash lever at idle position, the carb throttle shaft should be closed, held against the idle stop screw.

Engine off, dash lever at full speed, the carb throttle shaft should be spring loaded to the wide open position.

Set the dash lever to full speed, watch the carb throttle shaft when you start the engine. It should start out at wide open, then modulate back to near closed as the RPM comes up.

If the engine fails to respond, the governor should return the throttle to the wide open position in an attempt to restore the RPM.

You can play around with it, watch it work. With the engine up to full governed speed, manually close the throttle by pushing the governor arm to the idle position, release it, the throttle should instantly spring wide open, then modulate back to the preset speed. If the engine fails to respond, the throttle will remain wide open until the RPM comes up.

The length of the rod from the governor arm to the carb throttle shaft is critical. If that length has been tampered with, or the carb throttle arm has been changed or the angle of the arm changed, it can put the stroke length of the governor out of range. To check it, with the dash lever set at a mid range position, disconnect the link from the carb to the governor arm. Hold the link in the throttle closed position, have an assistant start the engine.

Be careful because you are in control of the engine speed!

Observe the position of the governor arm. Slowly start bringing the RPM up. As it reaches the 2000-2500 RPM range, the governor should start moving back. Carefully note where it stops moving back. Shut off the engine. Hold the rod in the idle position. The length of the rod in the idle position should match the place the governor arm stopped moving back. Adjust the rod length accordingly.

Of course all this depends on the engine performing as it should. if something is wrong that it won't accept throttle without stumbling, repair that first!