8045 hydraulic oil leak

Any one hand problems with the valve under the seat leaking?

is it suposed to ha a copper washer or o-ring going into the housing

has leaked since i bought the tractor in the spring

Which valve- the one for the PTO & TA ?

3ph one that sticks up through the floor

I'm still not sure which valve you mean, is it the rotary flow valve or have you a spool valve for 2nd set of hyd couplings ?
Crystals don't often leak, most pipe couplings are Jic type and have no sealing rings whilst the banjo bolts all have copper rings, and the face fit castings have o rings in grooves, so when you take them apart its fairly obvious what to use.

I think the valve controls 3 point hitch drop speed?

there was nothing in it as far as I can tell it is the pipe under the valve going into the houseing that was leaking

it leaked farly heavy with the hitch up and stoped when you droped the hitch

so the hitch is chaind up at the moment and not leaking at all

I could not find any thing sealing the pipe when I took it apart so I used an o ring but it only lasted about a month or so