XCMG 550DK Fan Pump For XCMG 550DK excavator

product parameters

Part No：XCMG 550DK Fan Pump
Applicable Equipment：XCMG XE550DK large excavator, matched with fan motor
Material：High strength alloy cast iron housing, carburized alloy steel piston, bronze valve plate, heavy-duty roller bearing
Surface Treatment：Manganese phosphate anti-rust coating, ultrasonic deep cavity cleaning, thoroughly remove casting sand, metal scraps and burrs inside flow channel
Control Mode：Proportional electric control, adjust flow according to temperature signal
Rated Working Pressure：26 MPa
Max Instantaneous Peak Pressure：32 MPa
Feature：Compact variable piston construction, proportional flow control, stable pressure output, low internal leakage, good contamination resistance, low vibration & noise, specially designed for XCMG XE550DK large excavator independent cooling system
Working Temperature：-20℃ ~ +115℃
Package：Independent anti-rust packing + Standard export carton
Storage suggestion：Keep dry, avoid moisture, rust and collision, indoor constant temperature storage, stay away from corrosive gas

• **Stable pressure output & low leakage core performance**
Ultra-precision mirror grinding is adopted for pistons, cylinder block, valve plates and friction pairs. Combined with optimized internal sealing structure, the pump features low internal leakage and stable pressure holding. It maintains consistent hydraulic output under long-term fluctuating pressure, avoiding insufficient fan power caused by pressure drop.
• **Heavy-duty durable structure for mining working conditions**
The whole shell is made of high-strength alloy cast iron with stress relief annealing treatment, which eliminates internal structural stress. It effectively resists strong vibration, hydraulic impact and dust corrosion in open-pit mines, solves common problems such as shell deformation and internal part wear, and greatly extends service life.
• **Strong anti-pollution & anti-cavitation capability**
Optimized internal flow channel structure reduces fluid turbulence and cavitation. It adapts to slightly contaminated hydraulic oil on construction sites, effectively avoiding particle jamming, abnormal noise and component wear. It runs stably for a long time and reduces frequent maintenance failures.
• **Energy-saving & full system protection**
Intelligent proportional control only supplies required flow as needed, reducing unnecessary power consumption. It keeps engine and hydraulic system working within safe temperature range, avoiding overheating damage to engine, radiator and hydraulic accessories. It is a high-cost-performance aftermarket replacement part for XCMG XE550DK daily maintenance and overhaul.

FAQ 

**Q1: Which excavator model is this fan pump suitable for? Is it universal?**
A1: This variable piston fan pump is specially customized for **XCMG XE550DK** large excavator, for the original proportional cooling hydraulic system. It is not universal for other models. It must be matched with corresponding fan motor. Wrong model will lead to insufficient flow and machine overheating.

**Q2: What factory tests have been done to ensure quality?**
A2: All pumps are 100% tested on a professional hydraulic test bench, including pressure test, flow curve detection, high and low pressure tightness test and internal leakage inspection. Each unit is strictly screened to ensure stable performance after installation, and test records can be provided upon request.

**Q3: How to extend the service life of the fan pump?**
A3: Before installation, thoroughly flush the hydraulic pipeline, replace new hydraulic filter elements to remove dirt and impurities. Check shaft, seals and mounting bracket for wear. After installation, perform no-load test run first to check noise, pressure and temperature rise, then put into heavy-load operation.

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