Flip back the ROPs on the left side of skid on the side of chain case there is a plate with two 1/2" bolts with jam nuts this is what you use to adjust tracking.
Is the oil level at the right level may want to check. When I see oil pushing out of the breather like you say it is doing sounds to me like the oil level is to high. Aren't the chain case and hydrulic oil in seperate reservoirs. Maybe there is a crack where the two meet making the oil higher...
Better check your model number again. They never made a 600 skid loader. Also Gehl never used a single cylinder Deutz engine in less someone repowered it. Better double check this skid loader out.
If that nut is already tight you don't want it tighter. You could have broken the two key ways in the axle where the sprocket goes on. To me it sounds like you have bad wheel bearings if the axle is flopping around. To get the nut to break loose you may have to use a 3/4" drive breaker bar with...
Gary at Worthington Ag has been great to me helped me find some used skid loader parts. Was going to tell you to call him if you could not find your part put you beat me to it.
I have a question on using truck tires on my Lahman Little Dipper. I am thinking using 205/75/15 tire on this skid loader. This skid loader will not get that much use. Use it mostly for snow and would put tire chains on it any way. Now I priced out some 7.00x15 skid loader tires and asked about...