CBT-F4 Series Hydraulic Gear Pump | CBT-F425-AFHL CBT-F420

Genlu Hydraulic proudly presents the CBT-F4 Series high-pressure external gear pumps, meticulously designed as highly efficient and durable hydraulic power elements tailored for agricultural machinery, construction vehicles, and material handling equipment. This targeted lineup highlights classic left-hand (L) rotation models including CBT-F425-AFHL, CBT-F423-AFHL, and CBT-F420-AFHL. Serving as the beating heart of mobile hydraulic circuits, the Genlu CBT-F4 series adheres strictly to universal industry standards regarding mounting flanges, shaft extensions, port dimensions, and internal displacements, enabling seamless 100% Drop-in Interchangeability. Supported by our uncompromising 100% Simulation Load Testing, each gear pump undergoes rigorous validation at rated and peak pressures before shipment, ensuring relentless power delivery and superior volumetric efficiency even in the harshest outdoor heavy-duty environments.

Technical Specifications 

• Product Series: CBT-F4 Series High-Pressure External Gear Pump

• Representative Models & Geometric Displacement:

  • CBT-F420-AFHL: 20.0 cc/rev

  • CBT-F420-AFHL: 23.0 cc/rev

  • CBT-F425-AFHL: 25.0 cc/rev

• Rated Operating Pressure: 20 MPa (200 bar / 2900 psi)

• Max Peak Pressure: 25 MPa (250 bar / 3625 psi)

• Rated Speed: 2000 rpm

• Max Operating Speed: 2500 rpm

• Rotation Direction: L (Counter-clockwise / Left-hand rotation, viewed from the shaft end)

• Structural Configuration: A (Standard splined/keyed shaft), F (Square mounting flange), H (Standard threaded/flange ports)

• Housing Material: High-tensile extruded aluminum alloy body with cast iron end covers

• Product Weight: Approx. 3.5 kg to 4.2 kg (varies by specific displacement)

Key Technical Advantages:

• Lightweight & High-Strength Housing: Utilizing a premium extruded aluminum alloy body significantly reduces the overall unit weight (enhancing energy efficiency for mobile machinery) while drastically improving thermal dissipation to prevent system failures caused by excessive oil temperatures.

• Automatic Axial Clearance Compensation: Equipped with precision-engineered floating bushings (or thrust plates). During operation, high-pressure fluid forces these components against the gear faces, actively compensating for axial clearances based on real-time system pressure. This maintains a volumetric efficiency above 92% even under continuous 20 MPa loads.

• Heavy-Duty Self-Lubricating Bearings: Fitted with top-tier DU composite self-lubricating journal bearings or specialized needle roller bearings. These provide exceptional radial load-bearing capacity and anti-galling properties, ensuring the pump shaft remains unscarred during high-frequency shocks and low-speed, heavy-load cycles.

• Precision Machining & Low Pulsation: The internal gear profiles are shaped and ground using advanced CNC machinery, achieving an extremely high contact ratio. This precision heavily dampens flow pulsation during fluid discharge, resulting in smoother operation and keeping noise levels well below industry averages.

Application Areas:

• Agricultural Machinery: Hydraulic hitch systems for medium to large tractors, and steering/header lift power sources for combine harvesters.

• Material Handling Equipment: Main lifting pumps for masts and tilt cylinders in both internal combustion and electric forklifts.

• Light Construction Vehicles: Auxiliary hydraulic implement circuits for compact wheel loaders and mini-excavators.

• Specialty Duty Trucks: Hydraulic PTO applications for sanitation vehicles and tow trucks.

Expert Maintenance Tips:

• Absolute Rotation Verification: The “L” suffix on this batch designates absolute Left-Hand (Counter-Clockwise) rotation. Before installation, strictly verify the rotation direction of your prime mover (electric motor or engine PTO). Reversing the input rotation will cause the shaft seal to blow out within seconds, resulting in immediate fluid ejection and catastrophic pump failure.

• Fluid Cleanliness & Suction Resistance: It is strongly recommended to install a return-line filter with an absolute rating of at least 10μm, maintaining fluid cleanliness to the ISO 4406 19/17/14 standard. Additionally, ensure the suction line is generously sized and perfectly sealed to prevent high vacuum levels that induce destructive cavitation.

• Cold Start Protocol: In freezing winter environments, hydraulic oil viscosity becomes extremely high. During initial startup, jog the pump at low speeds for several minutes to allow the fluid to warm up and establish a proper hydrodynamic lubrication film before engaging full operational loads.