Excavator CAT E330GC E336GC E345GC Hydraulic Pump Assembly 551-1122 568-3007 550-4341 Main Pump (New/OEM/Refurbished) Purchasing and Installation Guidelines Verify OEM part number compatibility, including regulator and servo valve assembly Require hydraulic bench test report for pressure, flow, and case drain leakage For remanufactured units, confirm replacement of pistons, cylinder block, valve plate, slippers, bearings, and all seals Inspect pump housing for pores and