Hydraulic Main Pump 139-8800 158-9066 259-0823 for E365B Excavator

This hydraulic main pump, available under part numbers 139-8800, 158-9066, and 259-0823, is the primary hydraulic power unit specifically engineered for the E365B excavator hydraulic system. It delivers high-pressure hydraulic oil to drive the boom, arm, bucket, travel, and swing assemblies.

Built with a variable piston structure, precise flow control, wear-resistant alloy materials, and precision machining, this pump offers direct replacement installation and stable output performance for demanding heavy-duty mining and construction applications.

• 1.Internal piston and valve plate wear, resulting in pressure drop and weak action.
• 2.Internal seal failure causing hydraulic oil leakage.
• 3.Abnormal noise and vibration during operation.
• 4.Servo piston sticking, leading to flow adjustment failure.
• 5.Housing cracks caused by overload and high pressure.

• 1.Confirm the part number and machine serial number before ordering.
• 2.Verify spline specification, mounting dimensions, and control type.
• 3.Request strict pressure and performance testing before shipment.
• 4.Shockproof wooden packaging to prevent transit damage.
• 5.Quality warranty covering manufacturing defects.