CNC hydraulic pump repair
Repairing a gear-type hydraulic pump for a CNC cutting machine involves disassembling the housing, inspecting gear and shaft wear, and replacing pressure O-rings. Common pump codes include PV2R, PVM, and GPV, which operate reliably in CNC connections under 140–210 bar pressure. ISO VG 46–68 hydraulic oil is typically used to reduce wear and maintain pump precision. Inspecting seals and gaskets prevents internal leakage and pressure drops. Adjusting gear clearance and checking bearings extends pump life up to 5000 operating hours. The pressure gauge on the outlet line should show less than a 5-bar deviation from the manufacturer’s standard.
Consumable parts include gears, shafts, O-rings, and high-pressure seals, usually made from steel with 55–60 HRC hardness. Common failures include gear wear, shaft corrosion, and seal cracking. During repair, thorough oil flushing and debris inspection are essential. Operating pressure should be 120–210 bar with a volumetric flow of 20–60 liters per minute within ±3% accuracy. Shaft vibration above 0.5 mm indicates imbalance and requires realignment. Pump operating temperature should not exceed 75°C.
