A8VO200 Hydraulic Pump for Doosan DX380/DX420/DX480/DX500LC High-Pressure Variable Displacement Main Pump

Product Features

• Direct OEM Replacement: Designed to bolt directly into the pump mounting of DX380, DX420, DX480, and DX500LC excavators without modification.

• High Efficiency: The axial piston design delivers volumetric efficiency up to 95%, reducing energy loss and fuel consumption.

• Precision Variable Control: Integrated load sensing and constant power controls automatically adjust displacement to match load demand, preventing engine stall and improving controllability.

• Robust Construction: Heavy-duty swash plate, hardened piston shoes, and high-strength cylinder block withstand continuous 350 bar operation.

• Low Noise Operation: Optimized valve plate timing and port geometry reduce pressure pulsation and operating noise.

• Long Service Life: Through-hardened and precision-ground internal parts offer 8,000–12,000 working hours between overhauls under normal conditions.

Product Working Principle

This hydraulic pump is a swash plate type axial piston variable displacement pump. The engine drives the pump shaft, which rotates the cylinder block containing multiple pistons. As the pistons slide against the angled swash plate, they reciprocate within their bores, drawing oil from the inlet and discharging it at high pressure through the outlet. The swash plate angle is controlled by hydraulic servo pistons, which receive signals from the pump’s control valves. When the operator demands more flow, the control system increases the swash plate angle, increasing displacement per revolution. Conversely, when load pressure rises, the constant power control reduces the swash plate angle to keep the pump within the engine’s power envelope, preventing stall and maximizing efficiency.

Company Service

• Global Shipping: Fast, insured delivery via sea, air, or express courier to any job site or warehouse worldwide.

• Custom & OEM Orders: Laser-etched part numbers, custom paint finishes, and private-label packaging available.

• 24/7 Technical Support: Installation guidance, troubleshooting, and commissioning support via phone, email, or video call.

• Complete Parts Inventory: Seal kits, servo pistons, swash plates, and bearing sets stocked for immediate dispatch.

• Exchange & Core Options: Core return and exchange programs available for qualifying pumps to reduce replacement cost.

FAQ – A8VO200 Hydraulic Pump for Doosan Excavators

Q1: How do I confirm this pump fits my Doosan excavator?
This A8VO200 pump is manufactured to the OEM specifications for Doosan DX380, DX420, DX480, and DX500LC models. Please verify your machine’s serial number and compare the pump mounting flange, shaft type (splined vs. keyed), and port configuration with the specifications above. Send us photos of your old pump’s data plate if unsure, and our team will confirm compatibility before you order.

Q2: Is this a genuine Rexroth pump?
This is a high-quality aftermarket replacement pump manufactured to match Rexroth A8VO200 specifications. It is not a genuine Rexroth component, but it is designed, built, and tested to deliver identical performance at a significantly lower price. Many repair shops and fleet owners choose our pump for its proven reliability and cost savings.

Q3: What is the expected service life?
Under normal operating conditions with clean hydraulic oil and proper maintenance, the pump should deliver 8,000–12,000 working hours before an overhaul is needed. Factors like contaminated oil, cavitation, or operating above rated pressure can shorten this interval dramatically.

Q4: How do I install this pump?
Installation requires moderate mechanical and hydraulic skills. Drain the hydraulic system, disconnect all hoses and fittings, remove the mounting bolts, and carefully pull the old pump. Install the new pump with a new shaft seal and O-rings, torque all bolts to spec, refill with clean hydraulic oil, and bleed the system before starting. For step-by-step guidance, our technical team is available via video call.

Q5: Do I need to replace any other parts when installing a new pump?
We strongly recommend replacing the hydraulic oil and filters at the same time. Also inspect the pump drive coupling or splines for wear. If the old pump failed internally, metal particles may have contaminated the system—flush all lines and replace the return filter before installing the new pump.

Q6: What causes premature pump failure?
The most common causes are contaminated oil, cavitation from restricted suction or low oil level, operating above rated pressure, and using incorrect hydraulic oil viscosity. Always maintain oil cleanliness to ISO 4406 18/15 or better, check suction strainers regularly, and never exceed the pump’s rated pressure.