Product Overview
The CBQ-F550-AFHL is a high-pressure external gear pump from the CBQ-F5 Series, featuring a nominal displacement of 50 ml/r, a rated pressure of 20 MPa, and a peak pressure capability of 25 MPa. The pump housing is constructed from high-strength aluminum alloy, incorporating advanced internal technologies including axial clearance floating compensation, radial balancing, and DU self-lubrication. These engineering innovations deliver high volumetric efficiency, high pressure capability, low noise operation, excellent vibration resistance, and extended service life.
The CBQ-F550-AFHL is designed with full dimensional and interface compliance to original equipment specifications, enabling direct interchangeability without requiring modifications to hydraulic lines or mounting brackets. Every unit undergoes 100% factory testing under simulated actual working conditions to guarantee consistent performance and reliability in real-world applications.
Model Code Breakdown: CBQ — Product series; F — Pressure grade 20 MPa; 550 — Nominal displacement 50 ml/r; A — Oval flange mounting; F — Flange port connection; H — Rectangular spline shaft; L — Left-hand rotation (counterclockwise)
Technical Specifications
Model: CBQ-F550-AFHL
Nominal Displacement: 50 ml/r
Rated Pressure: 20 MPa
Maximum Pressure: 25 MPa
Minimum Rotation Speed: 500 r/min
Rated Rotation Speed: 2000 r/min
Maximum Rotation Speed: 2500 r/min
Volumetric Efficiency: ≥ 93%
Rotation Direction: L (Counterclockwise / Left-hand)
Mounting Type: A (Oval flange)
Port Type: F (Flange connection)
Shaft Type: H (Rectangular spline)
Inlet Port Diameter: 35 mm
Outlet Port Diameter: 25 mm
Weight: 7.3 kg
Fluid Medium: Hydraulic oil
Operating Temperature Range: 30–90 ℃
Housing Material: High-strength aluminum alloy
Key Technical Advantages
1. Axial Clearance Auto-Compensation Mechanism
The floating compensation technology automatically adjusts the clearance between gear end faces and side plates in response to system pressure, minimizing internal leakage and maintaining high efficiency throughout the pump’s service life. The pump sustains ≥93% volumetric efficiency even at low speeds (down to 500 r/min).
2. High-Strength Aluminum Alloy Housing & Precision-Machined Gears
The housing is manufactured from high-strength aluminum alloy, offering light weight, excellent heat dissipation, and superior corrosion resistance. The gear modulus is 5, providing high strength and load-bearing capacity. Precision machining ensures accurate gear meshing, reducing operational noise and vibration.
3. Radial Balancing & DU Self-Lubricating Technology
The internal structure incorporates radial balancing to eliminate unbalanced radial forces on gear shafts, significantly extending bearing service life. DU self-lubricating bearings provide additional protection during start-up and boundary lubrication conditions, minimizing wear.
4. Wide Speed Range & High-Pressure Capability
With a speed range of 500–2500 r/min and pressure ratings of 20 MPa (rated) / 25 MPa (peak), the pump adapts to diverse operating conditions—from low-speed high-torque to high-speed light-load applications. The robust design withstands frequent start-stop cycles and high impact loads in harsh environments.
5. 100% Factory Testing Under Simulated Working Conditions
Every pump undergoes comprehensive performance verification on test benches that simulate actual operating conditions, including pressure-flow characterization, volumetric efficiency measurement, noise level assessment, and seal integrity testing—ensuring batch-to-batch quality consistency and reliability.
Application Areas
Forklifts: 4.5-ton class forklift hydraulic systems
Loaders: Construction loader working hydraulic systems
Excavators: Small to medium-sized excavator hydraulic systems
Cranes: Truck-mounted and lorry-loader crane hydraulic systems
Road Rollers: Road construction machinery hydraulic systems
Agricultural Equipment: Combine harvesters, tractors, and other agricultural machinery
Industrial Hydraulic Systems: Die-casting machines, molding machines, presses, and other industrial equipment
Sanitation Machinery & Mining Equipment
Expert Maintenance Tips
1. Rotation Direction Verification
Confirm that the pump rotation direction matches the drive shaft before installation. The CBQ-F550-AFHL is left-hand rotation (counterclockwise). Never operate in reverse, as this will cause internal damage.
2. Shaft Alignment
Verify the alignment accuracy between the pump shaft and the drive motor (or engine) shaft. Ensure the connection produces no axial or radial loads. Use flexible couplings and maintain concentricity within 0.05 mm.
3. Port Cleanliness
Ensure the inlet port and suction lines are free from debris, metal chips, and contaminants before installation. Particulate contamination will cause rapid seal wear and increased leakage. Install a suction filter with a rating of 25 μm or finer on the inlet line.
4. Suction Line Layout
Ensure both suction and return line ends remain below the oil level at all times, and maintain adequate separation between them to prevent air entrainment from return flow. Keep suction lines as short and straight as possible to minimize inlet resistance.
5. Pre-Start Priming & Air Bleeding
Fill the pump cavity with hydraulic oil before installation. Rotate the pump shaft by hand several times to ensure internal lubrication. During initial start-up, loosen the drain port or outlet fitting to purge air from the system. Retighten only after continuous oil flow appears free of bubbles.
6. Avoid Starting Under Load
To maximize pump service life, avoid or limit start-up under loaded conditions. Always start the system under no-load, allowing the pump to reach stable operation before gradually applying load.
7. Fluid Cleanliness Management
Maintain hydraulic fluid cleanliness to NAS 1638 Class 9 or ISO 4406 18/15 or better. Replace filters regularly and monitor system oil cleanliness through routine sampling and analysis.
