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CBHY-G/F Dual External Gear Pump Full Product Introduction

 

1. Basic Product Overview

 

The CBHY-G/F Dual External Gear Pump is a coaxial tandem combined Hydraulic gear pump with differentiated pressure grades for two pump sections, refined on the classic CBHY high-pressure gear pump base platform. It features a G high-pressure segment and an F medium-high pressure segment assembled in one unified pump housing with a shared driving shaft, differing from installing two independent standalone Hydraulic gear pump units separately. With one power input, it provides two sets of hydraulic oil with distinct pressure parameters to serve separate branches inside a composite hydraulic system. The G section undertakes heavy-load main working drive, while the F section supplies power for steering assistance, pilot control and lubrication auxiliary loops. It is widely adopted as OEM original fitting and aftermarket replacement parts for wheel loaders, forklifts, agricultural harvesters and small special engineering machinery, optimizing the piping layout and reducing occupied installation space of complete equipment.

 

Model Code Explanation

 

- CBHY: Standard series code for high-precision external meshing hydraulic gear pump tailored for mobile machinery

- G: High-pressure specification segment, rated working pressure 25MPa

- F: Medium-high pressure specification segment, rated working pressure 20MPa

- G/F: Combination form of front high-pressure G pump and rear medium-pressure F pump

Dual segments support arbitrary customized displacement matching; flat key shaft, involute spline shaft and clockwise/counterclockwise rotation directions are optional.

 

2. Core Technical Parameters

 

Item Specification 

Product Type Differential Pressure Tandem Dual Combined External Meshing Hydraulic gear pump 

Rated Working Pressure G segment: 25MPa; F segment: 20MPa 

Instant Peak Pressure G segment: 28MPa; F segment: 25MPa 

Rotational Speed Range 600–2400rpm 

Displacement Configuration Two segments with independently customizable displacements 

Pump Body Material Integral nodular cast iron pump housing, carburized and quenched precision alloy steel gears 

Core Structure Floating side plate axial clearance automatic compensation, radial hydraulic balance structure, heavy-duty DU composite self-lubricating bearings 

Sealing Assembly HNBR oil-resistant seals as standard configuration; FKM high-temperature resistant seals available on request 

Applicable Hydraulic Medium ISO VG46, ISO VG68 anti-wear hydraulic oil 

Operating Temperature Range -20℃ ~ +90℃ 

Mounting Form Conventional oval flange mounting, direct drive via engine PTO port 

Volumetric Efficiency Both segments ≥92% 

Warranty Period 1 year 

 

3. Structure & Working Principle

 

This assembly consists of a shared main drive shaft, two groups of driving and driven gear pairs, isolated segmented pump cavities, floating compensation side plates, load-bearing bearings and independent inlet/outlet ports for each segment, acting as the graded power supply core of the whole hydraulic system:

 

1. External power drives the public main shaft to rotate synchronously, two gear assemblies operate simultaneously to form negative pressure in their respective suction cavities, drawing hydraulic oil from the shared hydraulic oil tank.

2. The G high-pressure segment outputs high-pressure hydraulic oil to drive main hydraulic cylinders or hydraulic motors, completing heavy-duty loading, lifting and digging actions in the primary working loop of the hydraulic system. The F medium-pressure segment delivers stable low-power flow for hydraulic steering, solenoid valve pilot control and gearbox lubrication auxiliary circuits.

3. Each pump segment is equipped with the same floating side plate compensation mechanism as a single standard Hydraulic gear pump, which tightly fits against gear end faces under working pressure to compensate axial wear clearance in real time, minimizing internal leakage and maintaining long-term stable volumetric efficiency.

4. The two hydraulic circuits operate in parallel with completely isolated oil passages without cross-flow of hydraulic oil, enabling simultaneous operation of main working and auxiliary functions. Return oil from both segments converges and flows back to the oil tank to finish the full hydraulic circulation.

5. The coaxial integrated design removes extra connecting brackets and transmission couplings, lowering mechanical friction loss compared to deploying two discrete Hydraulic gear pump units side by side.

 

4. Core Product Advantages

 

1. G/F differential pressure design accurately matches the load gap between main and auxiliary circuits, cutting invalid energy loss and elevating the overall energy utilization rate of the hydraulic system.

2. Integrated dual-pump structure simplifies intricate pipeline arrangement, perfectly adapting to narrow installation spaces inside equipment engine cabins; plug-and-play replacement requires no reconstruction of the original hydraulic system mounting structure.

3. Equipped with radial hydraulic balance and heavy-duty bearing structure, it alleviates eccentric wear of gears and tolerates tiny impurities mixed in hydraulic oil on construction and farm operation sites.

4. Floating side plate compensation structure slows efficiency attenuation caused by long-hour continuous gear abrasion, effectively preventing overall pressure drop of the hydraulic system.

5. Standard unified mounting dimensions realize quick replacement of old dual pumps, compatible with mainstream domestic complete machine assembly standards.

6. Flexible displacement combination options support personalized modification and upgrading of various equipment hydraulic system.

 

5. Typical Application Scenarios

 

1. Dual-circuit oil supply Hydraulic gear pump for wheel loader integrated hydraulic system: G segment for boom and bucket driving, F segment for hydraulic steering;

2. Hydraulic power assembly for 3–8 ton forklifts and mini engineering vehicles;

3. Supporting hydraulic component for large combine harvesters and forestry machinery, serving harvesting actuators and walking auxiliary loops;

4. Equipment renovation upgrade: replace scattered single pumps to streamline the overall hydraulic piping layout.