1965 ford 4000-very early model-C103703 bought with PTO kicked out-repaired that-all new fluid-got running a few months later; pto,3ph, hydraulics all working. Put a new hydraulic line on mower ,tooklines off of tractor to replace connectors. Started it:3ph very slow to move-now hardly at all. hydraulic lines not working. Pto worked a little while-now not at all. Tried bleeding air out of hydraulic lines-got some, but not a lot. Guessing there's an airlock somewhere, maybe causing a valve to stick. There seems to be some pressure at hydraulic hookups as very difficult to impossible to make connections. Does not seem to bleed down pressure by moving levers. Bled down a little overnite-still difficult, but possible to make connections. Not enough pressure to raise back of mower once load hits. PTO now does nothing. Trying to move hyd levers and 3ph levers back and forth not helpful Any helpful suggestions would be appreciated. Considering draining fluid, opening lines to relieve pressure and start over. Very frustrating!! Have read many posts online and haven't found solution Thanks