Hydraulic Main Pump 190-8199 251-8034 20R-7235 for M318 M322D Wheel Excavator

This hydraulic main pump, available under part numbers 190-8199, 251-8034, and 20R-7235, is the primary hydraulic power unit engineered specifically for the hydraulic system of M318 and M322D wheel excavators. It delivers high-pressure hydraulic oil to drive the boom, arm, bucket, travel, and swing assemblies.

Built with a variable piston structure, the pump features precise flow control, wear-resistant alloy materials, and precision machining. It is designed for direct replacement installation and delivers stable output performance under heavy-duty construction working conditions.

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

• Confirm the part number and machine serial number before ordering.
• Verify spline specification, mounting dimensions, and control type.
• Request strict pressure and performance testing before shipment.
• Shockproof wooden packaging is used to prevent transit damage.
• Quality warranty is provided for manufacturing defects.