CBHZ Series Hydraulic Gear Pump | CBHZQA-F25 CBHZG-F32 Forklift Pump

The CBHZ Series (including the reinforced CBHZG and low-pulsation CBHZQA variants) high-pressure hydraulic gear pumps by Chengyuan Hydraulic are high-performance fluid power units precision-engineered for material handling equipment—specifically 1 to 3.5-ton forklifts (such as Heli, Hangcha, Lonking, and other leading brands). Typically serving as the heart of a forklift’s primary lift and power steering infrastructure, these pumps tackle demanding daily duty cycles. Covering essential model designations like CBHZQA-F25-AL, CBHZ-F28.2-AL, and the specialized side-flange CBHZG-F32-ALH6L, we utilize high-strength forged aluminum alloy housings and fully floating pressure-compensated thrust bushings. Every CBHZ pump undergoes 100% simulated full-load operational testing matching real-world forklift lifting pressures to ensure premium volumetric retention and structural integrity, delivering guaranteed 100% original-place interchangeability.

Technical Specifications :

• Core Product Series: CBHZ / CBHZG (Reinforced High-Pressure) / CBHZQA (Low-Pulsation) Dedicated Forklift Gear Pumps

• Model Configurations Supported: CBHZQA-F25-AL / CBHZ-F28.2-AL / CBHZG-F32-ALH6L

• Nominal Displacement Offerings:

  • F25 Profile: 25.0 $cm^3/rev$

  • F28.2 Profile: 28.2 $cm^3/rev$

  • F32 Profile: 32.0 $cm^3/rev$

• Rated Operating Pressure: 20 MPa (200 bar / 2900 psi)

• Maximum Peak Pressure: 25 MPa (250 bar / 3625 psi)

• Rated Speed Velocity Range: 2000 – 2500 rpm

• Maximum Permissible Speed: 3000 rpm

• Volumetric Efficiency Index: $\ge 93\%$ (under 20 MPa rated load conditions)

• Primary Housing Material: High-Strength Forged Aluminum Alloy Die-Cast

• Drive Shaft Geometry: Standard rectangular spline or cutting-edge involute spline configurations

• Port Connection Coding: H6L represents distinct diamond/rectangular 4-bolt flange patterns (side/rear orientation)

Key Technical Advantages:

• Axial Pressure-Compensated Floating Bushings: Utilizing a highly optimized interlocking “figure-8” floating bushing assembly that leverages hydraulic pressure feedback to seal internal clearances. This continuous compensation maintains volumetric efficiency above 93% while significantly reducing mechanical drag under heavy mast lifting states.

• Heavy-Duty Forged Aluminum Housing: The main housing is forged from aircraft-grade aluminum alloy rather than standard cast aluminum. This process completely eliminates internal porosity and micro-cracks, significantly increasing fatigue limits and enabling the pump to manage high-pressure shocks triggered by sudden directional control valve shifts.

• Advanced Low-Pulsation Gear Profiles (QA Series): The CBHZQA variant features match-ground gear sets engineered with optimized tooth geometry and micron-level profile finishing. By minimizing fluid trapping between the meshing teeth, this architecture reduces output flow ripples by 40%, flattening high-frequency mast vibrations during high-lift indexing.

• Double-Lip High-Pressure Shaft Seal Assembly: Reinforced with a premium imported double-lip skeleton shaft seal paired with an integrated case drainage feedback design. It provides dependable sealing against shaft-end leakage under high engine RPMs and elevated transmission oil temperatures, eliminating cross-contamination between fluid reservoirs.

Application Areas:

• IC & Electric Counterbalanced Forklifts: Serving as the primary hydraulic power generator for 1.5-ton to 3.5-ton forklifts to actuate mast lifting, tilting, and specialized attachments like sideshifters and paper roll clamps.

• Compact Material Handling Rigs: Main hydraulic power source for electric walkie stackers, pallet trucks, and compact wheel loaders.

Expert Maintenance Tips:

• Ensure Strict Mechanical Alignment Upon Assembly: When mating the gear pump shaft to the engine power take-off (PTO) or transmission gear housing, verify exact spline concentricity. Any radial misalignment creates offset shaft loads, accelerating bearing wear and risking premature shaft seal blowout.

• Mandatory Pre-Lubrication Priming: Because forklift fluid tanks are often mounted level with or slightly below the pump centerline, air-binding can occur upon initial startup. You must pre-fill the pump chamber with clean hydraulic oil via the inlet port and rotate the shaft manually several times before turning the key.

• Strict Suction Strainer Maintenance: Forklifts frequently operate in high-dust warehouse or yard conditions. If the suction strainer clogs and restricts oil intake (inlet vacuum dropping below -0.03 MPa), the gear pump will suffer heavy cavitation—identifiable by a harsh rattling noise during lifting—which rapidly degrades the floating bushings.