Hello gang: As some are aware, I have a "couple" of new projects to tinker with. I can never seem to leave things be; one being a very stuck D4 7U. 
Everything was stuck, except for the tracks. I freed up the steering clutches as well as the pony pinion and engagement so far.
Dumped some diesel down the stubby exhaust as well. Pony will roll some now, but I need to yank mag for good measure; I think valves are stuck...
Any pointers on freeing up the main clutch? Lever is stuck in disengaged position; lubed all points so far; whacked on the lever at the case for fun.
I don't really want to split the tractor yet. I was hoping to free the engine up and see how it ran, before sinking $$$ into what I got as a parts machine.
The unit is an early one, so not much room to deal with in the opening (not a split case newer unit)
It is too clean and straight to make a donor of it, aside from the obvious stuck everything, the only thing it needs is a good drive sprocket on the left side.
The things I do for entertainment! TIA, JM.
 

Cat clutch assy is different than automobile/tractor with Pressure plates, however, you might try to make a very thin "chisel" to drive between the stuck disk and the flywheel. Plate.
Be very careful to not overdue in one place as you chance breaking the clutch disk material.

That method worked for Dad years ago on NAA Ford tractor that was prone to sticking clutch after heavy use and then sitting in cold damp for the winter.
Saved splitting the tractor.
CTS

I dont think that you have to split the machine to get to the clutch. If the tranny cover is not a two piece, you will need to pull the whole transmission/clutch cover, but that is much much easier than pulling the engine. I dont have my books handy, but I think that there is an inspection cover that you can open and see if there is something obviously wrong in the clutch area. Keep us posted on how it goes. Grant.

Hi, Juiceman.
I'm no 'ex-spurt' on these things but, if my aging mem'ry serves me rightly, that is a 'screw-in' clutch adjustment, so it might be worth undoing the ;locking bolt and trying to wind the adjustment backwards - gently enough that you don't break any of the parts - just a thought.

Just my 0.02.

It has the single piece top cover. I am being LAZY. If need be, I will take it off, but I really wanted to be able to pull start the machine and assess the condition of the main engine before dropping coins into the bowels of that thing. I need to see why I cannot get anything to move; who knows, it could be the interlock lever bound up or flat out rusted tight inside.
I don't give up easily, but there are other projects here that get priority. Maybe I will post a few pics later to whet the appetites of the lurkers. Hehehe. JM

Hi Juiceman,
Why dont you take the fenders off and cut the cover then you will have a 2 piece ilo a 1 piece. This will only take time with no dollars attached, it will also give you a good look at the clutch.

Regards

I don't know the D4, but is the interlock on the outside like a D6? I have had luck taking the interlock cover off, and spray lub on the shafts that engage the locks inside.

wouldnt dust sealing be a issue then. you would have to fashion a gasket. greased felt sheet would probably work.

I’ve wanted to make a two piece cover, one of the old magazine issues showed how to do it. I didn’t want to do a hack job of it; (no band saw here).
Whatever I do, it should be inside on cement and warm. Like I said, I need to focus on one at a time.
Some pictures. JM

Hi trainkid88,
On my 4g it was cut already with a gap of around 1/16 to 1/8 on an inch. To fill the gap i used a high density foam but you could cork gasket material to fill also.

Regards