Wow, thanks for the tips! I thought my only option was to hoist the tractor up on blocks, remove the wheels (no easy feat as it's all manual labour here - did it once before to replace wheel bolts / studs that had sheared and that was a major mission), open 'er up and replace the seals, replace the brake pads whilst at it, and probably replace all fluids afterwards too. A local tractor mechanic shop quoted me $700 per wheel seal replacement, not sure how much of that other stuff they do as well, it wasn't worth $1400 to me, and it'll be a while before I find enough time to do it myself. But those quick fixes sound worthwhile looking into!
I'd heard that the "a" designation meant the engine was petrol, not diesel - but you could be right, as only in the last few years have Aussies embraced diesel for cars, tractors etc. Before that, like 1920 through to the 90's, we had a love affair with V8's for power running on petrol, as (apparently) our diesel was such a poor quality that diesel engines were crap for small machines. So the "a" could be both - petrol for the aussie market! Apparently we're unique like that, certainly Europe and the US had decently refined diesel, and we do now. Not that Fergie is a V8, she's a little 4 cylinder straight, apparently the same engine placed in Triumph sports cars in the 50's as well. Not that I've seen a Triumph sports car either . . . but I bet there are far more TEa20's running around still working or useable than Triumph sports cars!
I'm actually in awe of the old girl, courtesy of a city boy surfer's lack of tractor knowledge. A couple of years ago she pulled a 10 ton truck (22,00 lbs) which had become bogged, out of a muddy ditch and didn't break a sweat. She pulls small and medium trees (14" diameter and 60' tall) down - OK, she sweated hard on that one
Low gear, big rope, no worries!