HENGYUHANG Hydraulic Power Unit Gear Pump CBK Series

| Overview of HENGYUHANG CBK Series Hydraulic Gear Pumps

The HENGYUHANG CBK Series is a high-performance, ultra-compact micro external gear pump purpose-built for direct integration into mini and micro hydraulic power units (HPUs). Widely recognized as the international benchmark pump for mobile lifting equipment, material handling machinery, and industrial compact power packs, the CBK Series is engineered across 12 granular displacement increments — from 0.8 cm³/rev up to 8.0 cm³/rev — delivering fluid flow rates from 1.6 l/min to 16.0 l/min at rated 2,000 r/min.

Manufactured with a high-tensile, heat-treated extruded aluminum alloy body and rigid alloy end plates, the CBK pump withstands rigorous cyclic high-pressure loading without structural deformation, achieving an exceptionally high power-to-weight ratio with individual pump weights ranging from just 0.55 kg to 1.50 kg. The internal rotating assembly incorporates vacuum-carburized alloy steel gears with microscopic flank finish, ensuring smooth, low-pulsation fluid delivery and quiet running acoustics (< 60 dBA). An automated hydrostatic axial clearance compensation structure dynamically balances internal gear side clearances against operating discharge pressure, eliminating internal slip and sustaining superior volumetric efficiency (≥ 90%) throughout demanding high-temperature, high-pressure duty cycles.

| Dimension of HENGYUHANG CBK Series Hydraulic Gear Pumps

| Interface Data Needed with the Drawing Across the 12 Models

| Pump Installation Specifications

| Modular Model Ordering Code Structure

CBK−F□−□□□

CBK−[Pressure][Displacement]−[Port Configuration][Mounting / Shaft][Rotation]

| Reading Your Replacement Code

Techspecs of HENGYUHANG CBK Series

4.1 Performance Data Across 12 Displacements

4.2 Operating Pressure & Speed Limits

4.3 Fluid & Filtration Specifications

Advantages of HENGYUHANG CBK Series Hydraulic Gear Pumps

Automatic Hydrostatic Axial Clearance Compensation

Equipped with internal pressure-balanced floating bush plates that continuously eliminate side leakage clearances as pressure builds, securing high volumetric efficiency (≥90%) and zero performance drop during prolonged operation.

Direct-Manifold Face Mounting (Integrated Front Port)

Front-face Ø9 mm discharge port with pre-machined O-ring recess installs directly against central HPU aluminum manifold blocks, eliminating external high-pressure hydraulic fittings, hoses, and potential leak points.

Carburized Alloy Steel Gears with Ultra-Low Pulsation

Precision gear teeth are vacuum-carburized, hardened, and finish-honed to microscopic tolerances, delivering smooth laminar flow, minimum pressure ripples, and exceptionally quiet running acoustics (<60 dBA).

Ultra-Compact & High Power Density

High-tensile extruded aluminum housing provides superior mechanical rigidity while keeping pump mass between only 0.55 kg and 1.50 kg, making it the ideal compact power source for space-constrained power packs.

Universal 40×40 mm & Flat Tang Fitment

Standardized 40×40 mm 4-hole mounting pattern, Ø32 mm precision pilot spigot, and 10×5 mm flat tang drive interface guarantee 100% mechanical interchangeability across global HPU central manifold blocks.

100% Computerized Factory Inspection

Every manufactured pump undergoes strict computerized bench testing for pressure holding, volumetric efficiency, flow consistency, and seal integrity prior to packaging.

Reference

6.1 Displacement & Model Matrix

Displacements Available: 0.8, 1.0, 1.3, 1.6, 2.1, 2.5, 3.2, 3.7, 4.2, 5.8, 6.0, and 8.0 cm³/rev.

• Mounting Interface (B6):

• Spigot Diameter: Ø32 mm (±0.05 mm), height 8 mm.

• Hole Pattern: 4-Ø8.5 mm through-holes on square pitch 40 mm × 40 mm.

• Drive Shaft: Flat tang key 10 mm width × 5 mm thickness × 12 mm height.

• Port Configurations (L8):

• Inlet Port: 3/8" female thread located on rear cover.

• Outlet Port: Integrated Ø9 mm discharge port on front mounting face with Ø12.7 mm O-ring groove.

• Optional Port Types: Side-in side-out, rear-in rear-out available upon request.

• Direction of Rotation:

• D: Clockwise (viewed from drive shaft end, standard default).

• S: Counter-clockwise (viewed from drive shaft end).

6.2 Target Brand Interchangeability Matrix

The HENGYUHANG CBK Series offers direct 1:1 functional, dimensional, and hydraulic replacement across major micro power pack pump manufacturers:

• Bucher Hydraulics / Monarch: Direct drop-in replacement for standard micro power unit gear pumps.

• SPX Stone / Fenner Power Units: Direct replacement for central block integrated gear pumps.

• Haldex / Concentric Micro Pumps: Exact fitment for compact DC/AC power unit central manifolds.

• KTI Hydraulics & Winner Hydraulics: 100% interchangeable across dump trailer and scissor lift power units.

• Hydraforce & Deltrol Fluid Products: Seamless replacement for custom manifold pump cavities.

• Vevor & Aftermarket Power Pack Units: Universal direct replacement for single-acting and double-acting hydraulic power units.

Brand Replacement & Interchangeability

The HENGYUHANG CBK Series gear pump is built to exact global manufacturing tolerances, guaranteeing seamless 1:1 mechanical and hydraulic replacement for standard micro power unit gear pumps from Bucher, SPX Fenner, Monarch, KTI, and Winner Hydraulics. The precision Ø32 mm centering pilot spigot, 40×40 mm 4-hole mounting pattern, 10×5 mm flat drive tang, and front-face Ø9 mm O-ring sealed discharge port match OEM manifold cavities down to the millimeter.

This enables immediate plug-and-play installation into existing hydraulic power pack central manifold blocks without requiring adapters, machining, or hydraulic line modifications. Power unit manufacturers, equipment builders, and repair technicians benefit from reduced procurement costs, rapid parts availability, and factory-certified reliability.

Applications

• Scissor Lifts & Aerial Work Platforms: High-pressure hydraulic lifting supply for mobile electric scissor lifts, push-around lifts, and mini aerial work platforms.

• Truck Tailgates & Commercial Vehicle Lifts: Reliable hydraulic actuation for commercial delivery vehicle tailgates, wheelchair van ramps, and cargo box lifts.

• Auto Service Hoists & Two-Post Car Lifts: Primary fluid power source for low-rise automotive service lifts, 2-post and 4-post parking lifts, and motorcycle lift racks.

• Dump Trailers & Light Tipping Trucks: Dependable 12V/24V DC hydraulic power for single-acting and double-acting dump trailers, utility trailers, and snow plows.

• Dock Levelers & Industrial Lift Tables: Smooth, low-noise hydraulic actuation for warehouse loading dock levelers, factory scissor lift tables, and freight elevators.

• Machine Tools & Clamping Units: Compact hydraulic pressure source for machine tool workpiece clamping, indexing fixtures, and automatic lubrication circuits.

Package & Shipping

Why Choose Hengyuhang?

• Direct Factory Precision Manufacturing & CNC Excellence: Manufactured in our state-of-the-art production plant equipped with high-precision 4-axis and 5-axis CNC machining centers, automated high-speed gear hobbing machines, and precision gear tooth flank grinders (Ra < 0.2 μm) ensuring microscopic internal clearances, ultra-quiet operation, and peak volumetric efficiency.

• 100% Full-Cycle Multi-Parameter Factory Inspection: Every single pump is tested on computerized dynamometer test benches, verifying volumetric efficiency (≥90%), flow output across rated rpm, continuous (21 MPa) and peak (25 MPa) pressure hold, internal bypass, and sound pressure levels. Zero untested units leave the factory.

• Seamless 1:1 OEM Drop-In Interchangeability: Dimensionally and hydraulically calibrated to global industry standards, guaranteeing direct 1:1 mechanical drop-in replacement across Bucher, SPX Fenner, Monarch, KTI, and Winner power units without manifold or coupling modifications.

• Flexible Engineering Customization & Rapid Prototyping: Backed by an experienced fluid power engineering team capable of customizing displacements, non-standard port orientations (side/rear), special shaft drives, integrated valves, and dual-pump arrangements with low MOQ requirements and rapid sample turnaround.

• Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Substantial raw material inventory of extruded high-tensile aluminum profiles, precision gear blanks, and seal kits enables lightning-fast 48–72 hour dispatch for emergency breakdown replacements, supported by complete global export logistics.

• 12-Month Comprehensive Warranty & Lifetime Technical Support: All pumps are backed by our 12-month full-coverage manufacturer warranty against defects in materials and craftsmanship, supplemented by 24/7 technical consultation, 2D/3D CAD model verification, and dedicated fluid power engineering support.