Was out of town so couldn't work on the tractor for a while. Weather hasn't warmed up (-25 this morning) but today I jacked up the back end and the back wheels turn pretty easily, except at one point they get significantly tougher to turn. The resistance lasts about 1/4 or less of a turn, then gets easier again. No noticeable difference between tires turning.
The seals on the brake cylinders are intact, although as I said earlier when I disengage the bar that connects the two brake pedals the left pedal has play and the right one doesn't move at all.
Does this help at all with the diagnosis?
If the brake cylinder was frozen would the wheels turn? Thanks. Erik