400914-00366B For Doosan DX500 520-9c Hydraulic Pump Rexroth A8VO225 Hydraulic Main Pump piston pump Aftermarket Original

This heavy-duty high-precision hydraulic main pump assembly has a core original part number of 400914-00366B, and the core adopts the classic A8VO225 double high-pressure inclined disc plunger pump type from Bosch Rexroth. This assembly provides high-quality aftermarket and original parts standards from major manufacturers, specially designed for Doosan heavy-duty excavators, perfectly matching 50 ton mining main models such as DX500 and DX520-9C. The product is optimized based on first principles for ultra-high pressure fluid mechanics, ensuring absolute certainty of power output under heavy loads. The physical dimensions of the packaging are approximately 890mm × 480mm × 510mm, with an overall net weight of approximately 265kg. The original factory standard position is connected.

"Extreme cleaning and alignment: Dust removal treatment is required for unpacking and lifting environments. Before connecting a new pump, all high-pressure oil pipes and feedback signal pipes must be thoroughly cleaned with a specialized cleaning agent. Tighten bolts using torque wrenches strictly according to the original factory standard torque for symmetrical and phased cross tightening.

Forced oil injection (core pit avoidance): After the main pump is lifted into place and before starting the engine, clean hydraulic oil must be filled from the oil injection/exhaust port on the top of the pump body. It is strictly prohibited to start dry grinding, otherwise the internal rotating components will undergo irreversible physical erosion within 3 seconds of ignition.

Low pressure exhaust transition: After the first ignition, force the engine to idle at low pressure for 10-15 minutes for automatic exhaust and thermodynamic adaptation. After the oil temperature is normal and the bubbles are cleared, gradually apply the working load."