D6 9u wet clutch won't disengage

I guess first question should have been is your clutch brake working?

If I am thinking about this correctly, your problem is you cannot get the transmission in gear after starting the engine. This means the clutch may be stuck for real or maybe just enough to keep the transmission input shaft spinning against the action of the clutch brake. I have had a 9U surge forward a foot or so as the engine started up just from the oil "stiction" in the clutch disks, so I don't think it would take too much to make it impossible to get in gear if the oil was especially thick or needed changing.

I used to start the tractor without locking the brake or setting the blade on the ground etc. One day I had it parked on a concrete slab and it moved as the diesel fired up. Sure got my attention! Now I am more careful about placing the transmission in neutral.

I guess first question should have been is your clutch brake working?

If I am thinking about this correctly, your problem is you cannot get the transmission in gear after starting the engine. This means the clutch may be stuck for real or maybe just enough to keep the transmission input shaft spinning against the action of the clutch brake. I have had a 9U surge forward a foot or so as the engine started up just from the oil "stiction" in the clutch disks, so I don't think it would take too much to make it impossible to get in gear if the oil was especially thick or needed changing.

I used to start the tractor without locking the brake or setting the blade on the ground etc. One day I had it parked on a concrete slab and it moved as the diesel fired up. Sure got my attention! Now I am more careful about placing the transmission in neutral.

[quote="ccjersey"]I guess first question should have been is your clutch brake working?

If I am thinking about this correctly, your problem is you cannot get the transmission in gear after starting the engine. This means the clutch may be stuck for real or maybe just enough to keep the transmission input shaft spinning against the action of the clutch brake. I have had a 9U surge forward a foot or so as the engine started up just from the oil "stiction" in the clutch disks, so I don't think it would take too much to make it impossible to get in gear if the oil was especially thick or needed changing.

I used to start the tractor without locking the brake or setting the blade on the ground etc. One day I had it parked on a concrete slab and it moved as the diesel fired up. Sure got my attention! Now I am more careful about placing the transmission in neutral.[/quote]

Number one rule, never start anything regardless of clutch position with the trans in anything but neutral.
That bothered me as I was reading ccjersey, the tractor surged forward!!!:rip:

I have had the oil pump break a shaft and things bound up. This was 30 + years ago don't remember just all the symptoms but know it would move to better place to work on it.

The rear seal was leaking and I was putting any ode oil that was around in it to finish the seasons planting. I believe I must of not looked close and had some sediment in the bottom of a bucket that got put in. Since have only used oil that is known for the clutch compartment, not the little bits that seam to be in every jug or bucket sitting in the corner.

In another case a new to me D6 after more than a 100 hours of us had the adjustment locks come loose and tighten the clutch so it would not lock over center. Found the threads on the locks where bad.

From experience I would suggest you check the rear bearing very closely and put all new seals and o-rings in the clutch when you have it out. Another thing to inspect closely is the clutch disc,the first part to ware out is the drive teeth not the friction surface. Had one that the teeth were 80% gone and friction surface was the same thickness as the new one.

Not the easiest job but very doable for a none mechanic to remove the clutch if you follow the book. But I will never understand why there is not a little more room from engine to transmission.

You could check the cluch oil pump iff the gear is still on the shaft some time the snap ring brook and the gear could slideb and squeeze in the cluch angagement

If you look inside the clutch and the thrust collar comes right to the back as you push the lever forward, something is locked right up inside the clutch itself, maybe a broken plate or seized thrust bearing, the only safe way forward is to take it out and find out.