Hi Tough, sorry your havin some problems. I have a G194, 1982 model with 1220 hours. Leonard, Lens12 is the man for parts, questions etc on Bolens Iseki's from what I have seen on this sight. I've attached a few pics of my tractor just so you can compare tires etc. The straight tread on mine, front end, came that way from the factory and my machine is 4WD.
As for the loader, I stumbled on this thread because I'm thinking of buying a new tractor but really all I need is a FEL and I had hoped to ask Leonard what he recommended etc. I can't trailer my machine to Indiana to his shop. (The better have says loader OK, new tractor ...we need to talk). Anyway, hyd fluid will and does break down over time. I know guys who have machines that loaders, 3PT. Hitch etc run fine on xyz hyd. oil. But put in ABC brand hyd. oil and nothing works. Spend the few bucks and drain and refill the hyd. oil. And as someone mentioned earlier, clean the screens, filters etc. For peace of mind I can't believe someone would put up with a very slow loader for 15 years.