CBKL-G/G Dual External Gear Pump

CBKL-G/G Dual External Gear Pump Full Product Introduction

 

1. Basic Product Overview

 

The CBKL-G/G Dual External Gear Pump is a high-pressure coaxial dual combined Hydraulic gear pump adopting helical external meshing gear design, a flagship model from Changyuan Hydraulic for forklifts and light construction machinery. Different from two separate single Hydraulic gear pump units installed discretely, this dual pump integrates two independent pump sections sharing one main driving shaft inside a composite pump housing. The model code G/G indicates both front and rear pump sections adopt G-grade 25MPa high-pressure configuration, supporting customized matching of two different displacements. It supplies pressurized oil to two independent branches in compact hydraulic system simultaneously: the large-displacement main pump drives lifting/working hydraulic cylinders, while the small-displacement auxiliary pump serves steering power or pilot control loops. It is the OEM standard matching and mainstream aftermarket replacement pump for internal combustion forklifts, small loaders, sanitation trucks and agricultural machinery .

 

Model Code Explanation

 

- CBKL: Series code for low-noise helical tooth high-pressure combined gear pump

- G: Pressure rating = rated working pressure 25MPa, peak pressure 28MPa

- G/G: Both front pump and rear pump are G high-pressure grade dual sections

Supports mainstream displacement combinations: G32/G25、G40/G20、G40/G32 etc.; optional SAE involute spline shaft, oval flange mounting, clockwise/ counterclockwise rotation.

Structural feature: Front pump housing adopts high-strength cast iron for heavy load bearing; rear pump housing uses lightweight die-cast aluminum alloy to reduce overall weight.

 

2. Core Technical Parameters

 

Item Specification 

Product Type Helical Tooth Dual Combined External Meshing Hydraulic gear pump 

Rated Working Pressure Both sections: 25MPa 

Instant Peak Pressure Both sections: 28MPa 

Rotational Speed Range 600–2400rpm 

Displacement Combinations Customizable: 20/25/32/40mL/r mixed matching 

Pump Body Material Front section: nodular cast iron housing; Rear section: high-strength aluminum alloy housing; carburized quenched helical alloy steel gears 

Core Structure Floating side plate axial clearance auto-compensation, radial hydraulic balance structure, DU double self-lubricating composite bearings 

Sealing Kit HNBR oil-resistant seals standard; FKM high-temperature resistant seals optional 

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

Operating Temperature -20℃ ~ +90℃ 

Mounting Form Standard oval flange mounting, SAE spline shaft PTO direct drive 

Volumetric Efficiency Single section ≥93% 

Noise Level 5–8dB lower than straight-tooth ordinary Hydraulic gear pump 

Warranty Period 1 year 

 

3. Structure & Working Principle

 

Consists of shared main drive shaft, two sets of helical driving/driven gear pairs, segmented independent pump cavities, floating compensation side plates, DU bearings and separate oil inlet/outlet ports for two sections, acting as dual-circuit integrated power source of the whole hydraulic system :

 

1. External power drives the common main shaft to rotate synchronously, two groups of helical gears operate at the same time; each suction cavity forms negative pressure to suck hydraulic oil from the shared oil tank.

2. Two pump sections deliver pressurized hydraulic oil to their exclusive pipelines of the hydraulic system respectively: main pump supplies oil for fork lifting, loading and other heavy-load actuators; auxiliary pump provides constant flow for hydraulic steering assistance.

3. Each section inherits mature floating side plate compensation technology of standard Hydraulic gear pump, automatically offsets axial wear clearance under working pressure to minimize internal leakage and maintain high long-term efficiency.

4. Helical gear meshing achieves gradual tooth engagement, effectively reducing meshing impact and flow pulsation; two hydraulic loops run in parallel without oil cross-interference, completing lifting and steering actions synchronously, return oil converges back to tank to finish circulation.

5. Coaxial integrated design omits extra connecting brackets and transmission parts, lowering mechanical friction loss compared to paired single Hydraulic gear pump installation.

 

4. Core Product Advantages

 

1. Dual-section G-grade full high-pressure design realizes equal high-pressure output for both working and steering loops, adapting to heavy-load frequent operation of forklifts, improving overall response speed of the hydraulic system .

2. Helical gear structure greatly cuts running noise and vibration, superior to straight-tooth Hydraulic gear pump in comfort and pipeline fatigue resistance.

3. Hybrid cast iron + aluminum split housing balances load-bearing capacity and lightweight layout, easy to install in narrow engine compartments of small mobile machinery without modifying original hydraulic system mounting positions.

4. Radial balance + DU double self-lubricating bearings reduce gear eccentric wear, with strong contamination resistance to adapt to on-site hydraulic oil with tiny impurities.

5. Floating side plate compensation keeps high volumetric efficiency for long service cycles, effectively avoiding system pressure drop caused by gear wear.

6. Standard SAE spline shaft and oval flange are fully interchangeable with original forklift OEM pumps, supporting quick plug-and-play overhaul replacement.

 

5. Typical Application Scenarios

 

1. Matching core dual-circuit Hydraulic gear pump for 2–5 ton internal combustion forklifts’ integrated hydraulic system: one section for lifting gantry, one for hydraulic steering;

2. Small wheel loaders, mini dump trucks dual-purpose hydraulic power assembly;

3. Light sanitation vehicles, small agricultural tractors and garden machinery combined oil supply unit;

4. Equipment renovation: replace outdated separate single pumps to simplify hydraulic pipeline layout.