Terratrac Steering??

Hard steering may be one of several reasons.

First and easiest is adjusting the linkage. There are 2 adjustments, one on the outside of the differential with a nut and locknut on the pull rod fron the steering levers. Adjust these first to see if you get good brake on each side. If not go to step 2 adjustment. To do this you will have to remove the rear cover from the differential. The oil will have to be drained before removing the cover. A tip here is to back the rear of the dozer onto blocks so the oil runs to the front and don't have to drain as much out. Unbolt the cover and you will see a rod connecting to each brake shoe with a threaded end and jam nut and clevis end with a pin and cotter key. Remove the pin and thread the rod to a shorter length. It helps if you loosen the outside adjustment before youreinstall the pins.
Another cause for hard steering in glazed brake shoe bands. Using the wrong gear oil will cause the bands to glaze and lose their friction capability. YOU MUST USE GL-1 MINERAL OIL ONLY.

Last cause is just plain worn out. George Miller on this site may have a source for relining these as I soppose the supply of new ones has long been exhausted.... Gene

My local tractor supply store carries the same oil in their Traveller brand. It is plainly marked GL-1 mineral oil... Gene