CBT & CBF & CBHLB Series Hydraulic Gear Pump | CBT-F426.5 CBF-E663 CBHLB-F550

The CBT, CBF, and CBHLB Series premium industrial and mobile high-pressure fixed displacement hydraulic gear pumps manufactured by Chengyuan Hydraulic are high-efficiency fluid power components engineered to match the rigorous operating design standards of global vocational machinery. This heavy-duty aftermarket alternative matrix systematically encompasses critical single-displacement and dual-flow multi-stage combinations found across intense engineering vehicles and industrial drive lines, including the CBT mid-high pressure single pump matrix (CBT-F310, CBT-F312, CBT-F314, CBT-F316, CBT-320, CBT-F426.5-AF), the heavy-duty high-displacement single unit CBF-E663-AFP, and specialized dual-circuit independent flows engineering double pumps CBHLB-F550/F520-AFXlF and CBHLB-F540/F516.

Operating as the primary driving hydraulic heart within agricultural tractor lifting arrangements, telehandler auxiliary lines, wheel loader steering manifolds, and factory pressing structures, a gear pump’s housing structural modulus and volumetric stability dictate high-frequency multi-way valve response times and actuator positional retention. Chengyuan guarantees 100% original-place drop-in interchangeability across all assemblies concerning standard 4-bolt square or rectangular mounting pilots, splined/keyed input shaft journals, port flange layout parameters, and double-stage delivery configurations. Prior to factory shipping, every single gear pump unit is subjected to 100% full-capacity simulated pressure, maximum speed, and cross-over torque tests on advanced digital diagnostics benches, ensuring high performance up to 25 MPa.

Technical Specifications 

• Primary Infrastructure Code: CBT Series / CBF Series / CBHLB Series High Pressure Fixed Gear Pump Standard

• Target Replacement Configurations: CBT-F426.5-AF, CBT-F310, CBT-F312, CBT-F314, CBT-F316, CBT-320, CBHLB-F550/F520-AFXlF, CBHLB-F540/F516, CBF-E663-AFP

• Geometric Volumetric Displacement Rating ($cm^3/rev$):

  • CBT-F310 / F312 / F314 / F316 Variants: 10.0 / 12.0 / 14.0 / 16.0 $cm^3/rev$

  • CBT-320 / F426.5 Variants: 20.0 / 26.5 $cm^3/rev$

  • CBF-E663 Variant: 63.0 $cm^3/rev$ (High-capacity heavy single unit)

  • CBHLB-F550/F520 Variant: Front Pump 50.0 $cm^3/rev$ / Rear Pump 20.0 $cm^3/rev$ (Dual independent supply)

  • CBHLB-F540/F516 Variant: Front Pump 40.0 $cm^3/rev$ / Rear Pump 16.0 $cm^3/rev$

• Rated Continuous Operating Pressure Threshold:

  • CBT / CBHLB Configurations: 20 MPa (200 bar / 2,900 psi)

  • CBF Heavy Cast Configurations: 25 MPa (250 bar / 3,625 psi)

• Maximum Allowable Peak System Pressure: Ranges from 27.5 MPa up to 31.5 MPa under peak load transient states

• Operational Drive Speed Range: 500 rpm – 3,000 rpm (Optimized for vehicle diesel engine transmission PTO direct-coupling)

• Shaft and Interface Design Identifiers: Suffixes like AF / AFP define a standard square mounting pilot flange paired with an involute splined drive shaft; XlF denotes a specialized dual-discharge decoupled port structure sharing a single common suction inlet.

• Factory Calibrated Volumetric Efficiency: $\ge 93\%$ (verified under full rated load at a 50°C baseline oil temperature)

Key Technical Advantages:

• High-Strength Deformation-Resistant Casting Casing for High Load Capacity: The primary CBF and CBHLB housings are sculpted from heavy-duty ductile cast iron or premium high-density forged aluminum alloys, conditioned via advanced thermal matrix aging. This rigid casing architecture limits internal micro-expansion under 25-31.5 MPa extreme shock pressures, mitigating internal cross-port oil slippage and preventing structural casing fatigue.

• Floating Bushing Assemblies with Axial Hydrostatic Pressure Self-Compensation: The inner rotating gear set leverages floating side thrust bushing blocks backed by specialized pressure-balanced sealing tracks. By channeling system high pressure behind the plates, this assembly forces a tight micron-level seal against the gear faces, self-compensating for long-term wear and holding volumetric efficiency over 93%.

• Micro-Precision Involute Tooth Geometry with Trapped-Oil Alleviation: The integrated drive and driven gear shafts are machined from premium 20CrMnTi alloy steel using micro-precision hobbing, vacuum case-hardened, and finished via fine grinding to reach HRC 58-62. Optimized fluid relief relief cuts eliminate pressure spikes during gear tooth meshing, dropping average operational acoustic noise below 68 dB(A).

• Heavy-Duty Front-End Anti-Friction Bearing系 Absorbing Radial Shear: To handle radial loads and eccentricities from engine pulleys or universal joints, the input shaft is supported by high-capacity imported needle rollers or self-lubricating DU composite sleeves. This structural setup maintains shaft concentricity during sudden speed changes, protecting the high-pressure front shaft lip seals from leaking.

Application Areas:

• Heavy-Duty High-Horsepower Agricultural Machinery & Vehicles: Supplying fluid power to main tractor hydraulic 3-point hitches, hydrostatic power steering lines, and harvester header positioning cylinders.

• Construction & Municipal Special Vehicles: Serving as the primary lift pump on heavy warehouse forklifts, auxiliary pilot feed lines on wheel loaders, and the main system supply for waste compaction trucks.

• Medium-to-Large Industrial Manifolds & Pressing Loops: Providing rapid low-pressure high-flow advance oil delivery on metal scrap balers, shear systems, and factory power packs.

Expert Maintenance Tips:

• Mandatory Fluid Pre-Fill Prior to Prime Mover Ignition: Because the tight clearances inside these gear pumps require boundary lubrication, running dry causes rapid failure. During initial mounting or after flushing the fluid loop, pre-fill the pump cavity with clean oil through the inlet port and manually rotate the drive shaft several turns. Jog the motor intermittently during startup. Never run the pump dry, or the floating bushings will gall against the gear faces from dry friction heat within seconds.

• Zero Shock Impact Tolerances and Concentricity Controls Along the Drive Shaft: When sliding the gear pump onto the engine PTO socket or electric motor housing, the splines or parallel keys must mesh smoothly. Never use a heavy hammer or heavy tools to force the coupling into position. Sudden axial impact loads can crack the internal alignment pins. Keep alignment concentricity tolerances strictly under $\le 0.05mm$ to protect the front lip seals from leaking under pressure.

• Enforce Clean Fluid Filtration Matrix to Eliminate Internal Scoring: High-pressure gear components are vulnerable to fine particulate abrasive scraping. Total loop fluid cleanliness must be held at or above ISO 4406 21/19/16, backed by a $\le 100$ mesh inlet suction strainer that is inspected routinely. Allowing sand dust or metallic friction particles to enter the fluid will score the bushing faces, causing severe pressure drops when hot, accompanied by high-pitched acoustic squealing.