Here goes another question about my Oliver 1365.  I was mowing pasture a couple of nights ago and on my last pass of the night I lowered the mower back down after rounding the end and it would never lift up again. I tried everything but no luck.  I have checked all the external linkage and even check all linkage in the housing under the seat.  Everything is connected properly.  Now what?  Thought about pulling the front plate in front of the piston to check the spool but I'm not sure if this would be a waste of time or not.  Any ideas?  I'm out of them.  It's weird how it happened all of a sudden with no other signs.  Thanks in advance