CBK-F8 Hydraulic Miniature Gear Pump 8.08cc 20MPa High Pressure

CBK-F8 Miniature High-Pressure Gear Pump

Product Overview

The CBK-F8 is a high-pressure, small-displacement gear oil pump belonging to the widely recognized CBK series, extensively used in construction machinery and hydraulic power unit applications. The pump consists of a pair of high-strength gears, bearing blocks, housing, front cover, and rear cover, featuring high-precision floating bearing blocks that automatically compensate for axial clearance—delivering exceptional mechanical and volumetric efficiency.

The CBK series gear pumps are characterized by low noise, low weight-to-power ratio, and maximum pressure capability up to 28 MPa—addressing the pressure limitations of previous CBN series pumps. As a flagship model in the series, the CBK-F8 delivers 8.08 cc/rev displacement, 20 MPa rated pressure, and 4,000 rpm maximum speed, making it ideal for a wide range of AC and DC hydraulic power units and medium-to-small hydraulic systems.

Technical Specifications (Bulleted List)

CBK-F8 Gear Pump – Technical Specifications

• Model Code: CBK-F8

• Displacement: 8.08 mL/r (0.493 in³/r)

• Rated Pressure (P1): 20 MPa

• Maximum Pressure (P2): 25 MPa

• Peak Pressure (P3): 28 MPa

• Rated Speed: 2,000 r/min

• Maximum Speed: 4,000 r/min

• Axial Clearance Compensation: High-precision floating bearing blocks, automatic compensation

• Fluid Type: Petroleum-based hydraulic oil (non-contaminating oils)

• Volumetric Efficiency: ≥90%

• Body Length (L): 113.5 mm

Key Technical Advantages

1. High-Pressure, Small-Displacement Design – Superior Power Density

The CBK-F8 delivers 20 MPa rated pressure and 28 MPa peak pressure with a compact 8.08 cc/rev displacement. Small displacement combined with high pressure enables exceptional power density within a minimal footprint—ideal for space-constrained applications requiring high-pressure output.

2. Floating Bearing Block Auto-Compensation – High Efficiency

High-precision floating bearing blocks automatically compensate for axial clearance in response to operating pressure. This technology ensures minimal internal leakage under high-pressure conditions, with volumetric efficiency reaching 90% or higher. Higher efficiency means lower power loss and reduced oil temperature rise.

3. High-Strength Gears with Precision Manufacturing

Gears are manufactured from high-strength alloy steel with precision machining and heat treatment, ensuring mesh accuracy and wear resistance under high-pressure, high-speed operation. Combined with precision-machined housing, this design effectively reduces operating noise and extends service life.

4. Compact and Lightweight Design

With a body length of just 113.5 mm and an excellent weight-to-power ratio, the CBK-F8 offers significant advantages in applications where installation space is at a premium—such as hydraulic power units and vehicle-mounted systems.

5. Flexible Porting Configurations

The CBK series offers five inlet/outlet port configurations: rear in/front out, side in/rear out, rear in/side out, side in/side out, and rear in/rear out. Both clockwise (CW) and counter-clockwise (CCW) rotation directions are available. This extensive range of options ensures seamless integration with diverse hydraulic system layouts.

Application Areas

• Hydraulic Power Units (HPU) – core hydraulic component for AC/DC power units

• Small Construction Machinery – mini excavators, compact loaders

• Agricultural Machinery – small tractors, implement hydraulic systems

• Material Handling Equipment – stackers, scissor lifts, compact forklifts

• Industrial Equipment – machine tool clamping systems, lubrication systems, automation hydraulic circuits

• Vehicle-Mounted Hydraulic Systems – dump trucks, street sweepers, specialty vehicles

Expert Maintenance Tips

1. Model Code Interpretation: In CBK-F8, “CBK” indicates the product series, “F” indicates pressure rating of 20 MPa, and “8” indicates nominal displacement of 8 mL/r. Understanding the code ensures correct selection and parts procurement.

2. Rotation Direction Verification: Confirm pump rotation matches system requirements before installation. The CBK series is available in both clockwise (CW) and counter-clockwise (CCW) options. Incorrect rotation swaps suction and pressure ports, potentially damaging the pump.

3. Porting Configuration Confirmation: The CBK series offers five inlet/outlet port configurations. Verify that the selected configuration matches the actual piping layout before installation. Incorrect configuration will prevent proper connection or system operation.

4. Fluid Cleanliness Management: Maintain system fluid cleanliness to ISO 4406 18/16/13 or better. The CBK series gear pump is sensitive to fluid contamination—install a suction filter with a minimum 100 μm rating.

5. First-Start Priming: Fill the pump cavity with hydraulic oil from the outlet port before first start-up. Running dry or with trapped air will cause severe gear and bearing damage.

6. Pressure Limitation: The system must be equipped with a relief valve. Peak pressure must not exceed 28 MPa. Excessive pressure can cause housing deformation, shaft seal damage, or even gear fracture.