View 0 Photos View 0 Videos 2004 Case 521D Hydraulic Valve Newly Listed $3,500 USD (USED) Case 521D Spools: 3 Part#: - Type: MAIN Ref# 377603A1 MAIN HYDRAULIC CONTROL VALVE ONLY ConditionUsedFits To Make(s)CaseFits To Model(s)521DPart Number377603A1Stock Number26056794 MLS Number14594024CategoryHydraulic Valves (Equipment) Last Updated9/10/2026 LocationSpencer, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info