Hydraulic Main Pump 566-8632 522-6893 for E349GC E352GC Excavator

This hydraulic main pump, with part numbers 566-8632 and 522-6893, is the primary hydraulic power unit specially designed for the hydraulic systems of E349GC and E352GC excavators. It supplies high-pressure hydraulic oil to drive the boom, arm, bucket, travel, and swing assemblies. Featuring a variable piston structure, precise flow control, wear-resistant alloy materials, and precision machining, it offers direct replacement installation and stable output performance for heavy-duty mining and construction working conditions.

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

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