Acquired a Long LandTrac 360 DTC (Korean) last season and decided to change fluids. Today I drained and refilled the Hydro / Trans fluid with a new filter. Three point and power steering work fine but I have NO TRANSMISSION ENGAGEMENT ? I suspect an air lock of some sort ? My owners manual doesn't address this issue .. only than to 'drain and fill'. For what it's worth this model does have 4 wet leads I've never used but may have something to do with this issue. Any help or where to get a repair manual for this unit would be appreciated. Thanks!