Compound Gear Oil Pump CBWS/F-D3

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

4 year

Product details

Compound Gear Oil Pump CBWS/F-D3 Full Product Introduction

(Embedded mandatory keywords: hydraulic system, Hydraulic gear pump)

1. Basic Product Overview

CBWS/F-D3 compound gear pump is an integrated tandem double-section combined gear pump, assembled by high-pressure main pumping unit and low-pressure auxiliary pumping unit sharing one input drive shaft. Unlike single-function Hydraulic gear pump that only supplies power oil for a single circuit, this compound structure integrates main power oil supply, auxiliary charging and lubricating oil delivery in one compact assembly, serving as a core power source component for complex dual-circuit hydraulic system on construction machinery, loaders, road rollers and sanitation vehicles. It adopts mature external meshing gear manufacturing technology inherited from standard industrial Hydraulic gear pump, realizing one-shaft drive dual oil output to simplify pipeline layout and reduce installation space, perfectly matching multi-valve groups and multi-actuator combined hydraulic configurations.

Model Interpretation

- CBW: General series code for compound tandem gear pump

- S/F: Dual-purpose configuration (S for main high-pressure hydraulic oil supply, F for auxiliary charging/lubrication oil supply)

- D3: Structural specification code, representing standardized 3# installation flange, matched spline drive shaft and fixed displacement gradient design for mainstream engineering vehicle power take-off ports

Design positioning: Main pump section for main working loop pressure supply, auxiliary pump section for brake charging, pilot control or reducer lubrication, compatible with hydraulic oil and low-viscosity lubricating oil.

2. Core Technical Parameters

Item Specification

Product Type Tandem Compound Double-section External Meshing Gear Pump (Upgraded combined version of conventional Hydraulic gear pump)

Main Pump Displacement Customizable 16–63mL/r

Auxiliary Pump Displacement Customizable 4–25mL/r

Main Pump Rated Pressure 21MPa; Peak Pressure 25MPa

Auxiliary Pump Rated Pressure 2.5–6MPa

Rotational Speed Range 600–2400rpm

Driving Mode Spline shaft direct drive from engine PTO

Pump Body Material Integral cast aluminum alloy shell, carburized alloy steel precision grinding gears

Sealing Assembly Standard NBR oil-resistant seals; FKM high-temperature resistant seals optional

Applicable Medium ISO VG46, VG68 anti-wear hydraulic oil

Operating Temperature -20℃ ~ +85℃

Mounting Form D-type 3# standard flange mounting

Warranty Period 1 year

3. Structure & Working Principle

The whole pump consists of front auxiliary pump cavity, rear main pump cavity, shared driving shaft, two groups of meshing gear pairs and integrated front/rear end covers. Driven synchronously by the engine power take-off shaft, it collaborates with valves and hydraulic motor sets inside the whole machine hydraulic system:

1. Rotation of the shared drive shaft simultaneously drives gear pairs in main and auxiliary pump cavities to operate; negative pressure forms on suction sides of both cavities to absorb oil from the common oil tank.

2. Main pump cavity conveys high-pressure hydraulic oil to the main working circuit, driving hydraulic cylinders and hydraulic motor to complete lifting, slewing and traveling heavy-load actions, functioning the same as an independent heavy-duty Hydraulic gear pump.

3. Auxiliary pump cavity outputs stable low-pressure oil for system charging replenishment, solenoid valve pilot oil supply or walking reducer forced lubrication circulation.

4. Two oil outlets are independent without cross-interference; when the machine is in idle condition, excess oil flow can bypass back to the tank for energy saving.

5. Compared with two separate assembled Hydraulic gear pump, the compound integrated structure eliminates redundant transmission and connecting pipelines, lowering power loss and leakage risks.

4. Core Product Advantages

1. One-shaft dual-pump integrated design replaces two discrete Hydraulic gear pump units, greatly simplifying complicated hydraulic system piping layout and cutting equipment assembly costs.

2. Reasonable pressure and displacement gradient matching: high-pressure main pump for heavy-load power output, low-pressure auxiliary pump for auxiliary loop auxiliary oil supply, realizing resource rational allocation without power waste.

3. Adopts high-precision gear grinding technology from standard Hydraulic gear pump, low flow pulsation, high volumetric efficiency, stable oil supply under long-time continuous high-speed operation.

4. Integral aluminum alloy die-cast shell features high structural rigidity and good heat dissipation performance, adapting to severe vibration and high-temperature working environments of off-road engineering machinery.

5. D3 standard flange mounting has strong universality, directly replacing old model compound pumps for equipment renovation, with easy spare parts procurement.

6. Built-in pressure relief protection for auxiliary pump cavity, avoiding overpressure damage to pilot and lubrication circuits, improving overall safety of the whole hydraulic system.

5. Typical Application Scenarios

1. Loader integrated hydraulic system: Main pump drives bucket/boom cylinders and traveling hydraulic motor, auxiliary pump supplies steering pilot oil and walking box lubricating oil;

2. Road roller, road sweeper hydraulic assembly: Main pump for compaction vibration and brush roller hydraulic motor drive, auxiliary pump for brake charging circuit oil supplement;

3. Modified engineering machinery hydraulic upgrading: Replace two separate Hydraulic gear pump to optimize compact engine compartment layout;

4. Small hydraulic station dual-circuit configuration: Main circuit for actuator driving, auxiliary circuit for filter cooling circulation and system pre-charging;

5. Agricultural heavy harvesters: Main pump for harvesting mechanism hydraulic drive, auxiliary pump for gearbox centralized lubrication.

6. Fault Replacement Instructions

Replace complete CBWS/F-D3 compound pump assembly for faults including inconsistent oil output of main/auxiliary pump, obvious pressure drop under load, abnormal knocking noise during operation, oil leakage at shaft seal or flange surface. Common causes include gear tooth surface abrasion, shaft spline wear, seal aging and internal bearing damage.