I have freed up several of these, and each one has been the linkage, and/or the little pedal itself. You just have to remove linkage pins, and lube and free up. I had a 574 and freed it up when I bought it. I now have a 485, and I use it all the time. When I am out of the 'trouble' spot and want it to release, I usually have to tap one or the other brake pedal, to take pressure off of the internals because they bind up when one wheel turns /or wants, to turn faster than the other. I use mine going down my hills when bush hogging, locking both wheels at the same speed, so one wheel does not try to turn faster than the other, and so the tractor does not get out of control. I use it pulling the baler up the steepest hills, and downhill also, and most of the times setting round bales out, trying to get out of the mud. I'll admit I could just use my brakes in all of these situations, but, the dif-lock works better all around. Mark.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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