CBTLZTA-F/F Dual External Gear Pump

CBTLZTA-F/F Dual External Gear Pump Full Product Introduction

 

1. Basic Product Overview

 

CBTLZTA-F/F Dual External Gear Pump is a forklift-specialized medium-high pressure coaxial integrated dual hydraulic gear pump , upgraded from classic CBTLZT forklift pump series. It integrates two independent external meshing gear assemblies inside one heavy-duty integrated housing with a shared main drive shaft, realizing one power input to output two fully isolated hydraulic oil circuits. The marking F/F means both front and rear pump sections adopt identical F pressure grade (20MPa rated pressure) + flange-type oil port connection for both ports. It is commonly configured as large-displacement main lifting pump + small-displacement hydraulic steering/pilot auxiliary pump, replacing two separate single gear pumps to simplify piping layout and save engine compartment installation space. Widely used as OEM original spare parts and aftermarket replacement parts for internal combustion/electric forklifts, mini loaders, sanitation vehicles and small agricultural machinery .

 

Model Code Explanation

 

- CBTLZT: Base series code for dedicated forklift external gear pump

- A: Standard diamond (rhombic) A-type flange mounting, universal installation for mainstream forklifts

- F/F: Dual pump both with F pressure rating (20MPa rated pressure), both inlet & outlet adopt flange connection structure

Optional configurations: flat key / rectangular spline / SAE involute spline shaft; clockwise (R) / counterclockwise (L) rotation; customizable displacement pairing for front & rear pump sections

 

2. Core Technical Parameters

 

Item Specification 

Product Type Coaxial Dual Combined External Meshing Hydraulic Gear Pump 

Rated Working Pressure Both sections: 20MPa (200bar) 

Instant Peak Pressure Both sections: 25MPa (250bar) 

Rotational Speed Range 600–3000rpm 

Displacement Combination Customizable pairing (common specs: 16/10,20/10,25/16,32/20,40/25 mL/r) 

Housing Material High-strength nodular cast iron front body + lightweight die-cast aluminum alloy rear cover composite structure 

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

Sealing Assembly HNBR nitrile rubber seals (standard); FKM high-temperature oil-resistant seals (optional) 

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

Operating Temperature -20℃ ~ +90℃ 

Mounting Form Standard diamond A-type flange mounting, direct drive via engine PTO interface 

Volumetric Efficiency ≥92% for both pump sections 

Warranty Period 1 year 

 

3. Working Principle

 

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

2. The large-displacement pump section delivers high-flow pressurized oil to drive fork lifting, tilting hydraulic cylinders for main heavy-load operations; the small-displacement section supplies stable constant flow for hydraulic steering, pilot valve control and gearbox lubrication auxiliary circuits.

3. Each pump unit is equipped with floating side plate compensation mechanism: system hydraulic pressure pushes side plates to closely fit gear end faces, automatically offset axial wear clearance, minimize internal leakage and maintain high efficiency during long continuous operation.

4. Two hydraulic oil passages are completely sealed and isolated without cross oil leakage, 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. Integrated coaxial design eliminates redundant connecting brackets and couplings, reducing mechanical friction loss compared with installing two discrete single pumps separately.

 

4. Key Product Advantages

 

1. Cast iron-aluminum composite housing balances structural rigidity and lightweight design, strong shock resistance and overload capacity, perfectly adapting to bumpy off-road working conditions of forklifts and small engineering machinery.

2. Dual F-grade identical pressure design ensures consistent pressure stability of two circuits, easy matching of main lifting + steering dual loops with simple system debugging.

3. Radial hydraulic balance + DU self-lubricating bearings reduce gear eccentric wear, excellent anti-pollution performance tolerating tiny impurities mixed in onsite hydraulic oil .

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

5. Standard diamond A-type flange installation and multiple shaft types fully interchangeable with mainstream OEM forklift pumps, supporting plug-and-play replacement without modifying original mounting structure.

6. Compact overall outline fits narrow installation space of forklift engine compartments, rich displacement combinations support personalized equipment modification.

 

5. Typical Application Scenarios

 

1. Core dual-circuit hydraulic power pump for 1–5 ton internal combustion/electric forklifts hydraulic system: main pump for fork lifting & tilting, auxiliary pump for hydraulic steering;

2. Hydraulic power assembly for mini wheel loaders, small dumper trucks and road sweepers;

3. Matching hydraulic component for small combine harvesters and garden agricultural machinery;

4. Portable hydraulic power stations, small special engineering vehicle hydraulic systems;

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

 

6. Fault Replacement Instructions

 

Replace the whole CBTLZTA-F/F pump assembly if any 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, DU bearing burnout, seal aging cracking.