View 0 Photos View 0 Videos 1986 John Deere 644D Hydraulic Valve Newly Listed $1,100 USD (USED) John Deere 644D Spools: - Part#: - Type: CONTROL VALVE Ref# T78801 ConditionUsedFits To Make(s)John DeereFits To Model(s)644DPart NumberT78801Stock Number25939200 MLS Number14143821CategoryHydraulic Valves (Equipment) Last Updated2/14/2026 LocationWinimac, IN, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info