In my opinion two things need to be addressed. The first is the actual lockup, and the second is the brake action. I have not ben into the brakes on these, so this is an external construct of the way it works. The hydraulic system has a pressurizing control system (MCV)supplying working pressure to the brake system. This pressure is dead headed at the control valving Prt#28. When the brakes are applied, this pressure is directed to the brake cylinder/piston, Prt#1, and 11. Sa pressure builds, the piston compresses the materials of the disks and stops the shaft. When the pedal is released, the piston returns as the fluid is blead off to the return pipe Prt#14. and the pressure remains at near zero in the cylinder.
This seems to be the case in your tractor because the pressure is at or near zero when the engine is running, and a bleeder is open.
If the brakes were getting pressure, the bleeder would be under direct pressure, and making a mess.
Questions: Does the bleeded make a mess when the engine is running and the brake is applied with the bleeder open?
Does the loosening of a brake apply tube (parts 32 or 34) (with a pan under it before starting) cause a mess?
If no real pressure/mess is hapening in the above, I believe your issue is in some other system!
If the wheels (and therefore the pinion shaft) are free when the tractor is shut off, then the brake components inside the drum/housing cannot be binding in the housing in the relaxed state. Thus I believe they would not bind with the near zero pressure supplied from the valve.
Is there a TA in the tractor. If yes, there could be the application of both front and rear clutches at the same time, thus preventing motion. These TA clutches are hydraulic. one locke it in direct, the other locks it in TAreduction to avoid coasting. If the levers are removed, the system might still be inside, as it hads been dramatically reconstructed. If it does not move with the brake lines removed or loose, This is my best guess! Jim
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