Probably did need to adjust the clutch. Folks usually get into trouble holding the pinion in engagement with the flywheel instead of the clutch..
Have you tried the CAT dealer? It's amazing what they have still for old equipment. Other than that, maybe someone on here can come up with some. Or a decent machinist make a couple.
Pulling the side mount pony motor is made easier by having the correct lifting brackets. Do you have a serviceman's reference book? I'm guessing you need to pull the whole unit and then disassemble it instead of trying to take off just the engine, but maybe someone else knows for sure.
On the push starting (or pull). If it would be more convenient to move the tractor to the shop, but you don't have something big to push or pull it with, I would lay down some timbers under each side of the blade and chain them to the push arms so they will come along with the tractor as it moves. It would be helpful if the rear end of each skid is held off the ground so it doesn't dig in. Then put it in reverse and pull or push it backwards . Should be a pretty easy start without the dozer dragging in the dirt. Once you get it started, you can finish the cable replacement and then lift the dozer to travel to the shop.
I check this morning and should have these pieces and the brake 5h6014 should be bad too
Are there any other parts that should be replaced while I have the pony off? Gemdozer, if you have the parts, what is the cost and how long does it take to get them to zip code 68651 in Nebraska USA? Thanks, Ross