Hydraulic Main Pump 176-3963 199-6947 311-7405 for M315C 315D 318D Wheel Excavator

This hydraulic main pump, available under part numbers 176-3963, 199-6947, and 311-7405, is the primary hydraulic power unit engineered specifically for the hydraulic system of M315C, 315D, and 318D wheel excavators. 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 construction conditions.

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

• Confirm the part number and machine serial number before ordering
• Check spline specification, mounting dimension, and control type
• Request strict pressure and performance testing before shipment
• Shockproof wooden packaging to prevent transit damage
• Quality warranty covering manufacturing defects