By "up" and "down", I assume me mean "forward" and "reverse?"
If so, then you've lost hydraulic reverse - but forward was working - and disengaging - up to now - correct?
What you need to do is stick a pressure gauge into the reverser-control-valve. Put a 150 - 200 PSI gauge into it. Run the machine. Pressure should be 100-130 PSI. Push the clutch in - and it should go to zero. If it DOES go to zero - but the clutch does not engage - you've got internal damage in the reverser and it needs to be taken out and torn apart. If it does NOT go to zero - you've got linkage problems going to, or inside the control vavle and you can probably fix it without tearing the reverser apart.
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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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