CBKEC Series High Pressure Gear Pump | CBKEC-G25-AFL CBKEC-F48-AF

The CBKEC Series external gear pumps from Chengyuan Hydraulic are high-performance power units designed for medium-to-high pressure applications. This series, including the CBKEC-G25 and CBKEC-F48 models, combines high-strength aluminum alloy bodies with floating side-plate compensation technology for exceptional volumetric efficiency. With various shaft ends (e.g., AFL straight key, AF tang drive) and port configurations, these pumps guarantee 100% original-place interchangeability. Every unit is subjected to 100% simulated condition testing to ensure mechanical stability and low-noise operation under extreme workloads.

Technical Specifications 

• Representative Models: CBKEC-G25-AFL / CBKEC-F48-AF

• Displacement Range: $1.0\text{–}8.0\text{ ml/rev}$

• Rated Operating Pressure: $20\text{ MPa (200 bar / 2900 psi)}$

• Maximum Peak Pressure: $25\text{ MPa (250 bar / 3625 psi)}$

• Max Operating Speed: $3000\text{–}3500\text{ rpm}$

• Min Operating Speed: $600\text{ rpm}$

• Shaft Options: AFL (Straight Key) / AF (Tang Drive or Spline)

• Flange Type: SAE Standard or European 2-bolt flange

• Volumetric Efficiency: $\ge 92\%$

Key Technical Advantages

• Floating Axial Compensation: Features high-precision floating bushings that utilize system pressure for automatic axial gap compensation. This compensates for thermal expansion, ensuring that volumetric efficiency remains high during continuous high-temperature and high-pressure cycles.

• High-Toughness Aluminum Body: The pump body is manufactured from high-strength extruded aluminum alloy. Compared to standard cast aluminum, it offers superior tensile strength, capable of withstanding $25\text{ MPa}$ peak pulses without deformation.

• Precision-Ground Gear Sets: Gears are made from premium alloy steel, induction-hardened, and precision-lapped. The optimized gear profile minimizes trapped volume pressure ripples, maintaining noise levels between $65\text{–}72\text{ dB(A)}$.

• Advanced Sealing & Bearings: Equipped with high-grade skeleton oil seals and self-lubricating DU bearings. This system provides excellent wear resistance, prevents shaft-end leakage, and significantly extends the service life of the pump.

Application Areas

• Industrial Machinery: Plastic balers, compact presses, and CNC hydraulic power units.

• Material Handling: Electric forklifts, scissor lifts, and truck tail-gates.

• Agricultural Equipment: Steering systems for compact tractors and header controls for harvesters.

Expert Maintenance Tips

• Suction Line Integrity: CBKEC pumps are sensitive to suction vacuum. Ensure the suction pipe diameter is sufficient and check for clogged filters to prevent cavitation.

• Fluid Cleanliness Management: Gear pumps are vulnerable to particles. Maintain system filtration at $10\mu\text{m}$ or better, keeping the oil cleanliness at ISO 4406 19/17/14.

• Initial Startup Priming: Never start the pump dry. Pour a small amount of clean hydraulic oil into the outlet port and rotate the shaft by hand before powering the system to ensure immediate lubrication.