D2 5U Goes into gear, clutch won’t engage

The interlock mechanism is in probleme

Tried all gears, same problem. It’s like it wants to slide into gear OK but just won’t stay

What is an interlock mechanism and is it adjustable?

Open the cover over the clutch and see if all the links in the over center mechanism are all hooked up. This happened to me. The cotter pin came out of the pin retaining the links. The clutch disk became crooked and tore all the teeth off the disk. Look in there and see if you can see any broken teeth in the bottom of the clutch compartment.
Chuck C

I am confused .........does the shifter stay in gear when you engage the clutch and the clutch pop out again

Or does the clutch stay engaged and the shifter pop out?

Or do both stay in place and the tractor fails to move?

While the tractor is sitting there instead of moving, what happens if you pull on the clutch? What about the shifter?

Can you pull the clutch back hard and get the tractor to do anything?

Do you have to snap the clutch in (back) and out (forward) or does it just mush back and forth without snapping?

If its snapping in and out, your clutch disk teeth are stripped off the outside edge. New clutch disks for the 4u/5u tractors are available aftermarket from general gear. I don't know the current availability of the thinner disks for the J series. The later u series have the clutch that can be removed from the top without pulling the engine.