If you haven't already done so, pull the springs that hold the expander halves together. Take some sand paper, and by hand, sand the ramps that the balls ride in. The other area where they can "drag" and not allow a release is the three areas where the expander circumference touches the "hat". Sand the surfaces of the expander and of the "hat" where they touch. Don't know what others use for lube but I use a hi temp grease to lube the balls and ramps and where the expander touches the hat. Also lube all linkages. Yes the "hat" can be milled to tighten up the clearance, don't remember how much though.
Anyway, that is what I did for my 560 and the brakes work well and do not lock.
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Today's Featured Article - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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