CBN Series Hydraulic Gear Pump | CBN-F304 CBN-F306 CBN-F308 | External Gear Pump

The CBN Series high-pressure external gear pumps by Chengyuan Hydraulic are high-reliability power units specifically developed for construction and agricultural machinery. This series includes popular models such as CBN-F304-C-FL-P-R, CBN-F306, and CBN-F308. Designed with high-strength aluminum alloy housings and floating bushing structures, CBN pumps maintain exceptional volumetric efficiency even under high-pressure conditions. Characterized by their simple structure, lightweight design, and strong contamination resistance, they are the ideal solution for medium-flow, high-pressure hydraulic systems. Every CBN gear pump undergoes 100% full-load testing to ensure that pressure ripple and noise levels meet the highest industry benchmarks.

Technical Specifications :

• Core Models: CBN-F304, CBN-F306, CBN-F308, CBN-F310, CBN-F314, CBN-F316

• Displacement: $4\text{ cc/rev}$ (F304), $6\text{ cc/rev}$ (F306), $8\text{ cc/rev}$ (F308)

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

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

• Max Speed: $3000\text{ rpm}$ (Min $500\text{ rpm}$)

• Shaft Type: Spline (C), Flat Key, or Tang (Spline is standard)

• Ports: Flange (FL) or Threaded (P)

• Rotation: Right (R, Clockwise) or Left (L, Counter-clockwise)

Key Technical Advantages:

• High-Strength Extruded Aluminum Housing: The pump body is manufactured from aerospace-grade aluminum alloy via a precision extrusion process. Compared to cast pumps, it offers superior pressure resistance and heat dissipation, preventing fatigue cracks under high-pressure cycles.

• Axial Clearance Compensation: The floating side-plate (bushing) structure uses hydraulic pressure to automatically adjust the clearance between the plates and gear faces. This technology ensures that volumetric efficiency remains above 95% even as temperatures rise.

• DU Self-Lubricating Bearings: Equipped with high-load capacity DU composite bearings, the pump exhibits low friction and excellent shock resistance. This significantly enhances mechanical efficiency and extends the operational lifespan of the unit.

• Precision-Ground Gear Sets: Gears are made from premium alloy steel with induction hardening and micro-grinding. This high-level tooth accuracy ensures smooth meshing, resulting in minimal pressure ripple and a quieter operating environment.

Application Areas:

• Agricultural Machinery: Tractor hydraulic lifts and harvester steering systems.

• Construction Equipment: Mini-loaders and auxiliary circuits for excavators.

• Material Handling: Power source for electric forklifts and hydraulic scissor lift platforms.

Expert Maintenance Tips:

• Rotation Verification: Always check the rotation direction (R for Clockwise, L for Counter-clockwise) before installation. Gear pumps cannot be reversed; doing so will blow out the shaft seal and cause internal damage.

• No Dry Running: The pump must be primed with clean oil before the first start. Dry friction generates instantaneous heat, which can weld the side plates to the gears and lead to total pump failure.

• Oil Filtration: While robust, we recommend a $25\mu\text{m}$ suction filter or a $10\mu\text{m}$ return line filter. Maintain oil cleanliness within NAS Grade 9 to prevent fine particles from scratching the side plates and reducing efficiency.