Excavator Rexroth A8VO225 Hydraulic Main Piston Pump for Doosan DX500-9 DX520-9 DX530 400914-00366 Sany SY485 SY550 60008150 Hyundai R520LC-9 R550 31KB-10030

Excavator Rexroth A8VO225 Hydraulic Main Piston Pump for Doosan DX500-9, DX520-9, DX530 (400914-00366), Sany SY485, SY550 (60008150), and Hyundai R520LC-9, R550 (31KB-10030). Heavy duty construction for mining applications. New and remanufactured units are available.

• Insufficient pump pressure & slow operation — Wear of piston, cylinder block and valve plate, excessive internal leakage.
• Weak operation & speed drop during combined movements — Worn servo valve (regulator), stuck load-sensing spool.
• Abnormal noise from pump — Damaged bearing, insufficient oil suction, contaminated oil, air leakage on suction line.
• Oil leakage from pump — Aged oil seal, damaged O-ring, casting porosity or scratched mating surface.
• Rapid rise of hydraulic oil temperature — Severe internal leakage, faulty cooling circuit, failed swash plate control.
• Engine stalling & speed drop — Over-high regulator pressure setting, overloaded pump output flow.