CBHZ-F31.5-ALH6L Hydraulic Gear Pump 31.5cc 25MPa

Product Overview

The CBHZ-F31.5-ALH6L is a 31.5 mL/rev single external gear pump used as a main hydraulic pump in forklift applications. Public forklift technical documentation directly identifies this model as a gear-type main pump and specifies a 31.5 mL/rev displacement.

The CBHZ family uses a conventional positive-displacement external gear architecture consisting of the pump body, cover, gear pair and supporting bushes. Public technical information also describes pressure-balanced support and automatic axial-clearance compensation intended to maintain volumetric performance as operating conditions change.

For replacement applications, the CBHZ-F31.5-ALH6L provides a practical combination of 31.5 mL/rev displacement, 20 MPa rated pressure and 25 MPa maximum pressure, with a maximum allowable speed of 3000 rpm according to published CBHZ-series data.

Our replacement units are engineered around the original installation requirements and subjected to 100% simulated operating-condition testing to verify pressure, flow stability, leakage and running performance before shipment.

Because no verifiable original manufacturer public catalog for this exact CBHZ configuration was located during this verification, the published engineering figures below are presented as cross-checked public data rather than claimed OEM manufacturer specifications.

Technical Specifications

CBHZ-F31.5-ALH6L

• Model: CBHZ-F31.5-ALH6L
• Pump Type: External Gear Hydraulic Pump
• Configuration: Single Gear Pump
• Nominal Displacement: 31.5 mL/rev
• Rated Pressure: 20 MPa / 200 bar
• Maximum Pressure: 25 MPa / 250 bar
• Minimum Operating Speed: 600 rpm
• Rated Speed: 2500 rpm
• Maximum Allowable Speed: 3000 rpm
• Volumetric Efficiency: ≥92% for published CBHZ-series data
• Control Method: Fixed Displacement / Mechanical Drive
• Typical Application: Forklift Main Hydraulic System
• Rotation: Verify from complete suffix/nameplate
• Shaft Configuration: H6 configuration should be verified against the original pump before ordering
• Port Configuration: Must be verified from the complete model code and physical pump
• Weight: Not stated here because an independently verified manufacturer value for the exact CBHZ-F31.5-ALH6L was not located

The 31.5 mL/rev displacement and forklift main-pump application are supported by equipment documentation, while the 20/25 MPa pressure and 600/2500/3000 rpm speed ratings are cross-checked against public CBHZ-series technical data.

Related CBHZ Models

The original search title also contains:

• CBHZ-F23-AL
• CBHZ-F25-AL
• CBHZ-F26.5-AL
• CBHZ-F30-AL
• CBHZ-F31.5-ALH6L
• CBHZ/CBHZB-F

Public CBHZ documentation lists multiple displacement options, including 23, 25, 26.5, 28.2, 30, 32 and 36 mL/rev. Different suffixes can identify shaft, port and mounting variations.

Examples include:

• CBHZ-F23-AL: 23 mL/rev
• CBHZ-F25-AL: 25 mL/rev
• CBHZ-F26.5-AL: 26.5 mL/rev
• CBHZ-F30-AL: 30 mL/rev
• CBHZ-F31.5-ALH6L: 31.5 mL/rev

The published CBHZ-series pressure/speed envelope is generally stated as 20 MPa rated, 25 MPa maximum, 600–3000 rpm, while the exact shaft and port configuration must be confirmed from the complete product code.

Key Technical Advantages

1. 31.5 mL/rev Displacement

The CBHZ-F31.5-ALH6L provides 31.5 mL/rev nominal displacement. The theoretical flow relationship is:

Q = Vg × n × ηv

At 2500 rpm, theoretical flow before volumetric-efficiency losses is:

31.5 × 2500 ÷ 1000 = 78.75 L/min

Actual flow depends on pressure, temperature, internal leakage and volumetric efficiency, so this value should not be treated as a guaranteed rated flow.

2. High-Pressure Gear Pump Architecture

Published CBHZ specifications indicate 20 MPa rated pressure and 25 MPa maximum pressure, making the series suitable for demanding forklift and mobile hydraulic systems.

3. Axial Clearance Compensation

Public CBHZ technical information describes a floating/pressure-compensation arrangement designed to control axial clearance and reduce internal leakage during operation.

4. Asymmetric Gear Profile

Published product information describes a dual-modulus, asymmetric gear-tooth design intended to improve load capacity while controlling flow pulsation and operating noise.

5. Proven Forklift Application

The CBHZ-F31.5-ALH6L is directly documented as a main hydraulic pump in forklift hydraulic systems, where it supplies flow for lifting and tilting functions.

6. Replacement-Oriented Configuration

The CBHZ family is available in multiple displacement, shaft, port and rotation configurations, enabling configuration matching for different forklift hydraulic systems.

Our replacement units are subjected to 100% simulated operating-condition testing to validate hydraulic performance before delivery.

Application Areas

The strongest documented application for CBHZ-F31.5-ALH6L is forklift hydraulics.

Typical applications include:

• Internal-combustion forklifts
• 3–3.5 ton-class forklift hydraulic systems
• H2000-series forklift applications
• Diesel forklifts
• Material-handling vehicles
• Industrial vehicle hydraulic systems

Public parts documentation also associates this model with selected Heli, Hangcha and Hyundai forklift applications; however, exact compatibility varies with model year, engine, mounting and hydraulic configuration.

Expert Maintenance Tips

Prime the Pump Before Startup

Ensure the pump and suction circuit are adequately filled with clean hydraulic oil before initial operation.

Control Inlet Restrictions

Inspect suction hoses, inlet filters and sealing points. Excessive suction restriction or air ingress can cause cavitation, abnormal noise and reduced volumetric performance.

Do Not Treat 25 MPa as Continuous Pressure

Published CBHZ data distinguishes 20 MPa rated pressure from 25 MPa maximum pressure. The 25 MPa figure should not be interpreted as a continuous-duty rating.

Keep Speed Within the Published Limit

The public CBHZ-series specification identifies 3000 rpm as the maximum allowable speed. For direct engine/PTO-driven forklift systems, the actual pump speed should be checked against the transmission ratio.

Verify the H6 Shaft Configuration

Do not assume two pumps with the same displacement are interchangeable. Before ordering, verify:

• Shaft spline
• Rotation direction
• Mounting flange
• Port positions
• Port thread
• Overall pump dimensions

Maintain Hydraulic Fluid Cleanliness

Inspect the hydraulic oil, suction screen and return filter whenever a pump is replaced. Contamination can accelerate wear of the gears, bushes and pressure-compensation components.