CBGTBLT Dual External Gear Pump

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Product details

CBGTBLT Dual External Gear Pump Full Product Introduction

1. Basic Product Overview

CBGTBLT Dual External Gear Pump is a heavy-duty coaxial tandem dual combined hydraulic gear pump , belonging to the upgraded CBGTB heavy-duty series, specially customized for large construction machinery, road rollers, asphalt pavers and heavy mining auxiliary equipment . It integrates two independent external meshing gear assemblies inside one integrated pump housing sharing a single main drive shaft, realizing one power input to supply two fully isolated hydraulic oil circuits. Normally configured as large-displacement main working pump + small-displacement steering/pilot auxiliary pump, it replaces two separate single gear pumps to simplify pipeline layout and save installation space. It is a standard OEM matching and aftermarket replacement spare part for medium & heavy engineering machinery under harsh dusty, high-vibration working conditions.

Model Code Explanation

- CBGT: Basic heavy-duty high-pressure gear pump series with floating side plate compensation

- B: Reinforced thickened pump body structure, enhanced radial load resistance

- L: Optimized low-pulsation internal runner + improved internal lubrication design

- T: Threaded oil port configuration (can be upgraded to flange port on request)

- Dual: Coaxial integrated two pump sections, independent inlet & outlet without cross oil leakage

Customizable displacement combinations (32/40/50/63/80/100 mL/r mainstream specs); optional flat key, rectangular spline, SAE involute spline shaft, clockwise/ counterclockwise rotation direction .

2. Core Technical Parameters

Item Specification

Product Type Heavy-duty Coaxial Dual Combined External Meshing Hydraulic Gear Pump

Rated Working Pressure Both sections: 20MPa

Instant Peak Pressure Both sections: 25MPa

Rotational Speed Range 700–2500rpm

Displacement Combination Two sections with independently customizable displacements

Pump Body Material Hybrid structure: thick nodular cast iron front housing + high-strength aluminum alloy rear housing; carburized quenched precision alloy steel straight gears

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

Sealing Kit HNBR nitrile rubber 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 A-type flange mounting, engine PTO direct drive

Volumetric Efficiency Single section ≥92%

Warranty Period 1 year

3. Structure & Working Principle

Consists of shared main drive shaft, two groups of driving/driven gear pairs, isolated segmented pump cavities, floating compensation side plates, heavy-duty bearings and separate oil ports for two sections:

1. External power drives the common main shaft to rotate synchronously, two gear sets operate simultaneously; each suction cavity generates negative pressure to draw hydraulic oil from the shared oil tank.

2. The large-displacement pump section outputs high-flow pressurized oil to drive boom, bucket, walking hydraulic cylinders/motors for heavy-load main operations; the small-displacement section supplies stable constant flow for hydraulic steering, multi-way valve pilot control and gearbox lubrication auxiliary loops.

3. Each pump section adopts floating side plate compensation mechanism: system hydraulic pressure pushes side plates to closely fit gear end faces, automatically compensate axial wear clearance, minimize internal leakage and maintain high efficiency during long continuous heavy-load operation.

4. Two hydraulic passages are completely sealed and isolated without oil cross-contamination, enabling synchronous operation of main and auxiliary machine functions; return oil from two branches converges back to the oil tank to complete full hydraulic circulation.

5. Coaxial integrated design eliminates redundant connecting brackets and couplings, reducing mechanical friction loss compared to installing two discrete single gear pumps.

4. Core Product Advantages

1. Cast iron-aluminum hybrid composite housing balances ultra-high structural rigidity and lightweight design, strong shock and overload resistance, perfectly adapting to construction and mining harsh working environments.

2. L low-pulsation runner + T threaded oil port design reduces fluid impact and pipeline vibration, lowering overall system noise and extending the service life of hoses and hydraulic valves.

3. Radial asymmetric balance structure greatly reduces gear eccentric wear, with excellent anti-pollution performance tolerating tiny impurities mixed in on-site hydraulic oil.

4. Mature floating side plate compensation technology effectively slows efficiency attenuation after long-hour heavy-load operation, avoiding overall hydraulic system pressure drop.

5. Standard oval flange installation and multiple shaft types are fully interchangeable with domestic mainstream OEM pumps, supporting plug-and-play overhaul replacement without modifying original mounting structure.

6. Rich displacement pairing options support personalized hydraulic system modification for various heavy machinery models.

5. Typical Application Scenarios

1. Dual-circuit core oil supply hydraulic pump for 5–8 ton wheel loaders integrated hydraulic system: main pump for loading actuators, auxiliary pump for hydraulic steering;

2. Hydraulic power assembly for heavy-duty road rollers, asphalt pavers driving vibration compaction motors and walking mechanisms;

3. Large combine harvesters, forestry logging machinery for harvesting execution and walking auxiliary loops;

4. Underground mining haulage vehicles, bulk material transport special engineering machinery matching power unit;

5. Old heavy equipment renovation: replace scattered single pumps to streamline overall hydraulic piping layout.

6. Fault Replacement Instructions

Replace the entire CBGTBLT dual pump assembly if either circuit suffers pressure drop, insufficient flow, inter-section cross oil leakage, continuous metal grinding abnormal noise or oil seepage at shaft seal & flange joint. Common failures: gear tooth surface abrasion, floating side plate scuffing, heavy-duty bearing burnout, seal aging cracking.