Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of cbn-5 series hydraulic gear pump in China, also supports customized service. If you're going to wholesale high quality cbn-5 series hydraulic gear pump made in China, welcome to get pricelist from our factory.
Principle
& Structure
Product Definition
The CBN-5 series hydraulic gear pump is a high-performance positive-displacement gear pump designed for medium-to-heavy-duty machinery. Capable of efficiently converting mechanical rotational energy into pressurized hydraulic flow, the CBN-5 serves as a reliable hydraulic power source for 15–25 ton excavators, large wheel loaders, high-torque tractors, and mining equipment. Its robust construction and stable performance make it an ideal choice for machinery requiring powerful output, a long service life, and continuous operation in harsh environments.
Working Principle
The pump operates on the fundamental gear meshing principle. A precision-machined driving gear and a driven gear rotate within a sealed housing. As the gears disengage on the suction side, they create a localized vacuum that draws hydraulic fluid into the pump cavity. The fluid is trapped between gear teeth, transported along the internal housing wall, and expelled under high pressure through the discharge port when the gears re-engage. This continuous cycle delivers a steady flow with minimized pulsation, supporting smooth operation of hydraulic cylinders and motors.
Structural Design for Heavy-Duty Reliability
Three-piece construction: A pressed-material middle body is sandwiched between aluminum alloy front and rear covers. This design provides the structural rigidity required for high-pressure operation while optimizing weight-a consideration for mobile equipment where weight affects fuel consumption.
Floating bushing axial pressure compensation: An internal floating bushing system automatically adjusts axial clearance as operating pressure fluctuates. This self-compensating mechanism maintains a tight internal seal, reducing internal leakage and preserving volumetric efficiency during sustained heavy-pressure cycles.
Precision gear profiles: Gears are manufactured with strict geometric tolerances to minimize fluid pulsation. This contributes to smooth hydraulic output-useful for operations such as boom positioning or gradual steering adjustments in large machinery.
Technical Features
Consistent High-Pressure Capability Across the Series
Within the CBN-5 family-from 20 mL/r to 63 mL/r-each model delivers a rated pressure of 20 MPa and a maximum pressure of 25 MPa. This design approach means that selecting a smaller displacement for space-constrained installations does not reduce pressure capacity. Whether your machine requires 20 mL/r for a compact loader or 63 mL/r for a large excavator, the pressure specification remains consistent across the series.
High-Flow Performance for Rapid Actuation
With displacements reaching 63 mL/r, this pump delivers the oil flow required to power multiple high-consumption functions simultaneously. In a 20-ton excavator, a CBN-F546 (46 mL/r) or CBN-F552 (52 mL/r) provides flow to actuate the boom, arm, bucket, and swing motor with minimal lag between operations. This contributes to cycle time efficiency and job site productivity.
Thermal Management Through Volumetric Efficiency
The floating bushing compensation system maintains ≥ 90% volumetric efficiency across the operating pressure range. Higher efficiency means less internal oil bypass, which reduces heat generation. For operators, this translates to:
Hydraulic oil operating temperatures typically remaining below 80°C
Extended oil service life
Reduced demand on the cooling system
Less energy converted to heat, supporting overall machine fuel efficiency
Specifications
Performance Data Table
| Model | Displacement (mL/r) | Rated Pressure (MPa) | Max Pressure (MPa) | Rated Speed (r/min) | Max Speed (r/min) | Volumetric Efficiency |
|---|---|---|---|---|---|---|
| CBN-F520 | 20 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F522 | 22 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F526 | 26 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F533 | 33 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F539 | 39 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F546 | 46 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F552 | 52 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F555 | 55 | 20 | 25 | 2500 | 3000 | ≥ 90% |
| CBN-F563 | 63 | 20 | 25 | 2500 | 3000 | ≥ 90% |
Parameter Interpretation
Displacement selection (20–63 mL/r): Displacement defines the oil output per revolution and is selected according to different machine requirements. The 20–33 mL/r models are suitable for medium wheel loaders and 8–12 ton excavators, offering compact design and good fuel efficiency. The 39–46 mL/r range provides a balanced solution for 15–20 ton construction equipment, combining speed and working force. The 52–63 mL/r models are designed for large excavators and mining loaders, delivering higher flow for demanding heavy-duty operations.
Pressure rating (20 MPa rated / 25 MPa max): All models in the CBN-5 Series are designed to withstand a maximum pressure of 25 MPa. This pressure rating provides additional safety capacity when machines experience sudden load changes, such as rock breaking, heavy digging, or ripping operations, helping ensure stable performance and longer service life.
Speed capability (rated 2500 / max 3000 r/min): The high-speed capability of the CBN-5 Series allows direct connection with many diesel engines, eliminating the need for additional reduction gearing in typical installations. This simplified drive arrangement helps reduce system cost, lower maintenance requirements, and minimize potential failure points.
Application
Construction Machinery
Excavators: Powers boom lift, arm extension, bucket curl, and swing motor. The CBN-F546 or CBN-F552 is a common specification for excavators in this size range.
Wheel loaders: Provides flow for lift arms, tilt cylinders, and steering functions.
Road rollers: Supplies vibration system and propulsion hydraulics.
Agricultural Equipment
Large tractors: Powers implement lift, steering, and auxiliary hydraulic functions during plowing and tillage operations.
Combine harvesters: Drives header height adjustment, reel speed control, and unloading augers.
High-capacity sprayers: Sustains boom lift and pump drive for chemical application systems.
Mining & Earthmoving
Dump trucks: Powers hoist cylinders and steering systems.
Rippers and dozers: Provides hydraulic force for ground-engaging attachments.
Material handlers: Supplies flow for grapple, magnet, or bucket controls.
Industrial Hydraulic Power Units
High-capacity HPUs: Used as the pump element for large presses, steel mill equipment, and industrial conveyor systems.
Installation & Maintenance Guidelines
Installation Steps
1. Shaft alignment: Use a flexible coupling between the pump shaft and the engine or motor. Misalignment accelerates bearing and seal wear. We recommend achieving alignment within 0.05 mm TIR using a dial indicator. Proper alignment also reduces system vibration and operating noise.
2. Flange mounting: Tighten the four mounting bolts to the recommended torque specification. Ensure the mounting surface is flat and clean. Distortion from uneven mounting surfaces can affect the axial compensation mechanism.
3. Suction line design: Use rigid pipe or wire-reinforced hose to prevent collapse under vacuum. Maintain fluid velocity below 0.5 m/s to reduce cavitation risk at high flow rates. A minimum suction hose inner diameter of 25 mm is recommended for all models.
4. Pressure line connection: Use hoses or pipes rated for at least 30 MPa working pressure. Install a pressure gauge at the pump outlet to monitor system pressure during start-up and routine checks.
Maintenance
Fluid hygiene: Contaminated oil is a leading cause of premature failure. Adhere to the ≤ 25 μm filtration requirement. The floating bushing depends on clean oil to maintain proper clearance and sealing.
Temperature monitoring: Keep oil temperature below 80°C. If the pump casing exceeds 70°C, inspect the oil cooler and system relief valves for proper function. High temperatures reduce oil viscosity and accelerate wear on the bushing and gear teeth.
Replacement parts availability: Genuine replacement kits-including shaft seals, O-ring sets, and wear plates-are available for all CBN-5 models. Contact our support team with your model code for specific part numbers and availability.
Company & Quality
Company History
Established in 1988, Onederful® Hydraulic has designed and manufactured hydraulic components for over three decades. We operate a dedicated hydraulic component facility with 200+ employees, including design engineers, production specialists, and quality control technicians.
Global reach: Our products ship to 20+ countries annually, with key markets in Russia, Europe, South America, and Southeast Asia. We maintain distributors and service partners in each region to support local customers.
Annual output: Our production capacity exceeds 10,000 containers of hydraulic products per year, allowing us to maintain inventory of standard models and respond to custom orders.
Quality Control Process
Each pump undergoes a documented quality verification process:
| Stage | Process |
|---|---|
| 1. Incoming material | 100% spectrographic analysis of aluminum castings and pressed bodies; dimensional verification of raw materials |
| 2. In-process machining | Real-time CNC probing maintains floating bushing clearance within ±0.01 mm; gear profiles verified to print tolerances |
| 3. Assembly | Clean-room assembly; seals lubricated with clean hydraulic oil before installation |
| 4. Final bench test | Each pump is mounted on a test stand and run through a performance cycle: pressure holding at 20 MPa and 25 MPa, flow stability verification, leakage check, efficiency calculation |
After-Sales Support
12-month warranty against manufacturing defects from Bill of Lading date
Technical documentation supplied with each order: dimensional drawings, installation manual, maintenance guide
Replacement parts available for all models
Response time: Technical inquiries typically answered within 24 hours
FAQ
Q: What is the advantage of the CBN-5 series hydraulic gear pump over smaller gear pump series?
A: The CBN-5 delivers higher flow (20–63 mL/r) while maintaining a uniform 20 MPa pressure rating across all models. This makes it suitable for larger machinery where smaller pumps may be flow-limited.
Q: Which shaft configuration should I specify?
A: Choose based on your power source interface: Plain Key Shaft for standard couplings, Rectangular Spline for high-torque PTO applications, or Flat Opening Shaft for specific OEM interfaces. Confirm your engine's output shaft specification before ordering.
Q: What are the operating limits for speed and temperature?
A: Rated speed: 2500 r/min; maximum speed: 3000 r/min. Temperature range: -20°C to +80°C using ISO VG 32 or 46 mineral hydraulic oil. Operation outside these limits will affect service life.
Q: Does the mounting flange match standard industry brackets?
A: Yes. The 4-bolt elliptical flange design is compatible with brackets used by major OEMs in construction and agricultural equipment. Reference our dimensional drawing for exact hole locations.
Q: Is each pump bench-tested before shipment?
A: Yes. Each unit is mounted on a test stand and subjected to performance verification including pressure holding, flow stability, leakage, and efficiency measurement.
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