Euclid said: “There is no royal road to geometry”. He wasn't lying.
Euclid TC-12's were a love-hate relationship. Imagine a dozer split in half right down the middle. A 6-71 Detroit on each side. Radiators in the rear. What a nightmare to work on.
LSF, does your dozer have a shuttle clutch? I have a few manuals you may be interested in but they are the original “Chinglish” translations. Have you contacted Northern Tool? I understand they have their own improved version.