CBT-E306 CBT-E310 CBT-E316 CBT-E325 Hydraulic Gear Pump | CBN Series Replacement

Genlu Hydraulic proudly introduces our CBT-E300 Series (and standard CBN series universal template) industrial and mobile-grade high-pressure aluminum-alloy external hydraulic gear pumps. Specifically engineered for agricultural machinery (such as medium-to-large utility tractors and combine harvesters), compact material handling systems (such as industrial forklifts and mini-loaders), and localized industrial hydraulic power units (HPUs), this pump line thrives under harsh cyclic workloads. This series delivers a precision-manufactured, cost-effective, and drop-in replacement for global classic fixed displacement CBN and CBT external configuration pump matrices. We specialize in supplying the entire displacement span, prominently covering the CBT-E304, CBT-E306, CBT-E308, CBT-E310, CBT-E312, CBT-E314, CBT-E316, CBT-E318, CBT-E320, and CBT-E325 designations.

As an essential and robust fluid power generator across global mobile networks, Genlu’s CBT-E/CBN pumps conform rigidly to industry-standard physical installation envelopes. We guarantee 100% Drop-in Interchangeability across standard mounting styles (including universal SAE 2-bolt and rectangle geometric pilot flanges), diverse drive shaft profiles (straight keyed, rectangular splines, or tang/flat-end drivers), and multi-spec oil ports (standard pipe threads or split-flange configurations). Prior to final packing, each gear pump assembly undergoes 100% full-rated-load volumetric efficiency verification, dual-thrust plate pressure balance seating audits, and transient over-speed impact logging, guaranteeing peak output and leakage-free operation on high-dust, heavy-vibration jobsites.

Technical Specifications 

• Product Line: CBT-E300 / CBN Series High-Pressure Fixed Displacement External Hydraulic Gear Pump

• Displacement Model Matrix Covered:

  • CBT-E304 / CBN-E304 (Geometric Displacement: 4.0 $cc/rev$)

  • CBT-E306 / CBN-E306 (Geometric Displacement: 6.0 $cc/rev$)

  • CBT-E308 / CBN-E308 (Geometric Displacement: 8.0 $cc/rev$)

  • CBT-E310 / CBN-E310 (Geometric Displacement: 10.0 $cc/rev$)

  • CBT-E312 / CBN-E312 (Geometric Displacement: 12.0 $cc/rev$)

  • CBT-E314 / CBN-E314 (Geometric Displacement: 14.0 $cc/rev$)

  • CBT-E316 / CBN-E316 (Geometric Displacement: 16.0 $cc/rev$)

  • CBT-E318 / CBN-E318 (Geometric Displacement: 18.0 $cc/rev$)

  • CBT-E320 / CBN-E320 (Geometric Displacement: 20.0 $cc/rev$)

  • CBT-E325 / CBN-E325 (Geometric Displacement: 25.0 $cc/rev$)

• Continuous Rated Operating Pressure: 16.0 MPa to 20.0 MPa (160 bar to 200 bar, depending on specific frame displacement size)

• Maximum Intermittent Peak Pressure Threshold: 25.0 MPa (250 bar / 3625 psi)

• Permissible Operational Shaft Velocities: Minimum 600 rpm; Maximum rated velocity 2500 rpm to 3000 rpm

• Drive Shaft Interface Variants: Standard 6-tooth rectangular spline, straight parallel keyed, or flat-ended tang drive shaft options

• Rotation Options: Clockwise (Right-Handed: “R” code) / Counter-Clockwise (Left-Handed: “L” code) viewed from the shaft extension face

• Volumetric Efficiency Target (@ Rated Boundaries): $\ge 93\%$

Key Technical Advantages:

• High-Strength Die-Cast Aluminum Body for Superior Pressure Resistance: The main housing is built from premium die-cast aluminum alloy treated to optimize grain density. This design minimizes unit weight for mobile machinery while remaining rigid under continuous 20 MPa loads, preventing housing expansion, deflection, or structural micro-fractures.

• Axial Clearance Compensation via Floating Side Bushings: Incorporates high-load DU composite bushings paired with a floating “3-shaped” side plate thrust assembly. System pressure is automatically routed beneath the thrust plates to bias them safely against the gear faces with micron-scale precision. This mechanism maintains volumetric efficiency above 93% even after long service periods.

• Precision Shaved Gears and Unloading Grooves for Quiet Operation: The internal steel gears undergo precision CNC hobbing and shaving to ensure consistent involute tooth contact. Specialized hydraulic unloading grooves machined into the inner faces eliminate the destructive oil trapping common in external gear configurations, reducing noise and structural vibration.

• Modular Thru-Drive Shafts for Flexible Tandem Configurations: The CBT-E300 pump housing supports a modular thru-drive connection at the rear face. This allows engineers to tandem-couple a primary CBT-E316 with a smaller secondary gear pump on a single input shaft, enabling clean dual-circuit flow splitting for forklift lifting and steering circuits.

Application Areas:

• Modern Agricultural & Forestry Implements: Three-point hitch lift systems for utility tractors, front header controllers for combine harvesters, and steering-assist oil loops.

• Compact Material Handling & Logistic Support Vehicles: Main hydraulic power source for 1-ton to 3-ton electric/IC industrial forklifts, skid-steer loader arm circuits, and municipal waste management lifters.

• Fixed Industrial Automation Units: Power sources for commercial automotive workshop lifts, compact recycling balers, and low-pressure machine tool fixture clamping loops.

Expert Maintenance Tips:

• Verify Rotational Alignment Prior to First Power Coupling: When ordering or swapping a CBT-E/CBN series core, always check whether the existing unit uses Clockwise (R) or Counter-Clockwise (L) rotation. Reversing the pump rotation relative to its build configuration will route high pressure directly against the low-pressure shaft lip seal, rupturing the seal and causing external fluid loss or internal seizure within seconds.

• Prevent Vacuum-Side Air Leakage to Avoid Fluid Foaming: The high intake velocity of external gear configurations makes suction line integrity crucial. Inspect all suction hose clamps and flange seals for structural gaps. Allowing air to enter the intake path can cause serious fluid foaming, which can lead to jerky cylinder action and accelerated tooth face pitting.

• Install a 25-Micron Absolute Suction Filter to Protect the Housing: Gear pumps tolerate fluid contamination better than high-pressure piston units, but their aluminum housings can still be scored by coarse debris. If metal shavings or grit recycle through the loop, they can score the interior clearance tracks, causing internal bypass leakage that significantly drops delivery pressure when the oil heats up.