Hi' I don't know how your shift sequence works, Do you have a button or switch on your FEL lever? On my loader I have a button that when pressed disengages the gearbox so I get full hydraulic power to lift a 5000lb + load if required, Could be a fault in the switch if you have one, some tractors also have a transmission disconnect switch for running PTO's either on the instrument panel or part of the F/N/R lever so it wont start in gear, Might be just a faulty switch, or switch adjustment , Chinese switches are crap mostly steel plated not copper or brass contacts I have had several fail burn out fall to pieces or just rust up. Could even be a lose connection broken wire as 385 hours is bad even for Chinese clutch but not un heard of especially if a generic part was used. Get a multimeter or some one who knows how to use one and go over your electrics.
Regard's
Flad
Regard's
Flad