CBQ Series Hydraulic Gear Pump | High Pressure CBQ-F525 F532 F540 F550

The CBQ Series high-pressure hydraulic gear pumps manufactured by Chengyuan Hydraulic are high-efficiency fluid power generators purpose-built for heavy-duty earthmoving machinery, mining equipment, material handling lifts, and environmental transit fleets. This prominent platform includes high-pressure single units such as CBQ-F550-AFP, CBQ-F540-AFP, CBQ-F532-AFP, and CBQ-F525-AFP, alongside the dual-delivery asynchronous tandem configuration, the CBQT-F540F420-AFPL. Utilizing high-strength extruded aluminum housings and hydrostatically balanced floating bushings, these pumps sustain continuous operational performance envelopes under pressures ranging from 20 MPa to 25 MPa. Every singular CBQ pump and CBQT tandem array undergoes 100% simulated load testing for volumetric efficiency redlines, flow delivery under full rated pressures, case seal integrity, and inter-stage tandem flow isolation prior to shipment to ensure matching original parameters and offer proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Framework: CBQ / CBQT Series High-Pressure Medium-to-Large Displacements Aluminum Gear Pumps

• Model Configurations Supported: CBQ-F550-AFP / CBQ-F540-AFP / CBQ-F532-AFP / CBQ-F525-AFP / CBQT-F540F420-AFPL

• Geometric Displacement Matrix:

  • F525 Profile: Single pump displacement of 25.0 $cm^3/rev$

  • F532 Profile: Single pump displacement of 32.0 $cm^3/rev$

  • F540 Profile: Single pump displacement of 40.0 $cm^3/rev$

  • F550 Profile: Single pump displacement of 50.0 $cm^3/rev$

  • F540F420 Tandem Profile: Front stage element 40.0 $cm^3/rev$ / Rear stage element 20.0 $cm^3/rev$

• Nominal Operating Pressure (Code F): 20 MPa (200 bar / 2900 psi)

• Intermittent Peak System Pressure: Up to 25 MPa (250 bar / 3625 psi)

• Permissible Input Speed Range: 600 rpm to 2500 rpm

• Flange & Drive Shaft Layout Codes (A/F/P):

  • Code A Layout: Standard square/rhomboid multi-bolt universal mounting flange template

  • Code F Layout: Involute splined input shaft or straight parallel keyed drive (matched per specific catalog blueprints)

  • Code P Layout: High-pressure 4-bolt split flange configuration or standard threaded port terminals

• Drive Rotational Direction Designators:

  • Standard Blank / Right-Hand: Clockwise rotation (looking directly from the input shaft extension)

  • Suffix L / Left-Hand: Counter-clockwise rotation (e.g., CBQT-F540F420-AFPL requires counter-clockwise drive linking)

Key Technical Advantages:

• High-Density Extruded Aluminum Alloy Housing Monoblock: The central pump housing is formed from aerospace-grade high-density aluminum alloy via unified hot extrusion molds, rendering the metal completely free of internal structural voids. Under a peak 25 MPa transient pressure spike, micro-expansion is tightly restricted, reducing dead-mass while eliminating the porous casting cracks and fluid weeping issues native to cast iron housings.

• DU Composite Wear Bearings with Active Axial Float Compensation: The primary drive shafts turn within heavy-load DU composite journal bushings that resist extreme operational shear and cyclical shock loads. Back-biased by downstream high pressure oil, the “three-piece” floating axial balance plates adjust dynamically to offset structural micro-expansions under thermal loads, preserving steady volumetric efficiency exceeding 93%.

• Super-Finished Case-Hardened Involute Gearing Profiles: The gear sets are forged from premium alloy steel, carburized, quenched, and match-ground to Class 5 tracking metrics with tooth surface hardness levels hitting HRC 60+. This precision involute configuration completely flattens trapped oil volume spikes during gear mesh, substantially reducing operational fluid pulsation hums and mechanical vibration under high flows.

• Independent Circuit Fluid Isolation via CBQT Tandem Configurations: The CBQT-F540F420-AFPL dual-stage pump bridges two distinct displacement gears on a singular high-tensile internal drive link. With separated fluid channels and isolated P-ports, it simultaneously powers multiple mechanical sub-circuits (e.g., boom cylinder lifting loops and steering torque assist modules) from one input source, eliminating bulky multi-pump mounting boxes and split belts.

Application Areas:

• Mobile Earthmoving & Construction Equipment: Main hydraulic pump modules for 5-to-8-ton compact wheel loaders, mini-excavators, and crawler attachment setups.

• Heavy Material Handling & Logistics Lift Fleets: Primary pressure pumps for high-mast 3-to-5-ton heavy forklifts and outrigger/slewing loop feed systems on industrial truck cranes.

• Municipal Sanitation Upper Structural Components: High-pressure upper body actuators for environmental refuse compaction trucks, road washing machines, and multi-nozzle sweepers.

Expert Maintenance Tips:

• Mandatory Pre-Lubrication Filling and Hand Shaft Indexing: Gear tracking clearances are micro-machined; prior to running the pump on a newly mated engine or PTO pad, pre-fill the pump cavity with clean hydraulic medium through the inlet port and index the shaft 2 to 3 turns manually. Never spin the pump completely dry, or the floating side plates and gear tooth tips will score and gall within the first few seconds of engine turnover.

• Laser Drive Alignment Verification and Rigid Anti-Shock Mandate: If the input connection utilizes a direct inline coupling layout, the allowable radial runout and angular angular deviation must be tightly calibrated within $\le 0.05 \text{ mm}$. When installing a gear, sprocket, or coupling half onto the pump input tip, never drive the component home using a heavy steel sledgehammer, which shatters the internal axial alignment clips, ruining the pump.

• Enforce Strict Isolation of Suction Line Leakage and Inlet Collapse: Large displacement gear pumps exceeding 40 $cm^3/rev$ create intense vacuum forces within the inlet gallery at peak RPMs. Ensure the main suction line flange bolts are fully torqued and that the low-pressure hose profile shows zero mechanical collapse or kinking. Any pinhole gas ingress introduces air pockets that implode violently inside the mesh zone, pitting the aluminum chamber walls into a porous state within a few operating days.