first.. so we can understand you.. lets get some terminology straight.
the 'pto' doesn't use any fluid.. least not hyd anyway.
your machine, aft of the engine, has 3 sumps. tranny, then hyds, then rear end.
the sump with the check level by your foot is the tranny.
now... as someone told you.. the hyd lines fromt he engine pump run thru the tranny to the center section. it is common for the high pressur eline to rust/pinhole/perforate and then it literally sucks the center hyds section dry and overfills the tranny.
repair is to pull the old tube and then have a new tube machined and press it in.. or.. to drianthe sump.. swab the tube clean with solvent and a shotgun swab on a rod.. and then get some tubing.. some have used 10mm.. some have used slightly smaller.. and coat it with a non quick set epoxy liberally.. then push it in flush and allow to cure.
success rate for the bandaid fix is better than half..
On rare occasion I have seen reports here of a problem with the sleeve repair includig buildup of goop at the tube inlet.. also there has been posed some minor concern over reduced pipe flow due to smaller pipe id. luckilly this is a low flow system with a max near 4gpm.. and nominal flor rate near 2.5-3gpm, with excess oil unloaded and exhausted to sump.
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