CMW-F212.5-CFZS HCHC Gear Pump 12.5mL/r 20MPa

Product Overview

The CMW-F212.5-CFZS is an HCHC CMW Series fixed-displacement hydraulic gear pump with a nominal displacement of 12.5 mL/rev.

Hefei Changyuan Hydraulic Co., Ltd. (HCHC) states that it manufactures high-pressure unidirectional and bidirectional gear pumps and motors for mobile hydraulic systems used in construction machinery, special vehicles, agricultural equipment and mining applications.

The published technical data for CMW-F212.5-CFZS specifies a 20 MPa rated pressure, 25 MPa maximum pressure, 2000 rpm rated speed, 600–3000 rpm speed range, ≥88% volumetric efficiency, and bidirectional rotation.

The available engineering drawing also identifies an Ø80 mm locating diameter, Ø103 mm reference diameter, 4 × Ø9.5 mm mounting holes, M14 × 1.5 thread features and a 1:5 tapered shaft arrangement. These dimensions are particularly valuable for replacement engineering and installation verification.

For replacement applications, the complete CMW-F212.5-CFZS configuration should be verified against the original pump, including shaft geometry, mounting dimensions, ports, rotation requirements and installation envelope. Our replacement process supports in-place dimensional and functional interchangeability, followed by 100% simulated operating-condition testing before shipment.

Technical Specifications

• Model: CMW-F212.5-CFZS
• Brand: HCHC / Hefei Changyuan Hydraulic
• Series: CMW Series
• Pump Type: Fixed-displacement external gear pump
• Nominal Displacement: 12.5 mL/rev
• Rated Pressure: 20 MPa / 200 bar
• Maximum Pressure: 25 MPa / 250 bar
• Rated Speed: 2000 rpm
• Minimum Speed: 600 rpm
• Maximum Speed: 3000 rpm
• Volumetric Efficiency: ≥88%
• Control Method: Fixed displacement, mechanical
• Rotation: Bidirectional
• Housing Material: Not stated in the available model-specific technical document; no unsupported value is added.
• Weight: Not stated in the available model-specific technical document.
• Locating Diameter: Ø80 mm
• Reference Housing Diameter: Ø103 mm
• Mounting Holes: 4 × Ø9.5 mm
• Thread: M14 × 1.5
• Shaft Taper: 1:5
• Drain-Port Thread: M14 × 1.5, 18 mm depth
• Shaft Diameter Reference: Approximately Ø20 mm
• Keyway Reference: 4 × 6.5 × 18 mm according to the published drawing

Configuration Notes

CMW-F212.5-CFZS

The available documentation confirms that the F212.5 configuration corresponds to a 12.5 mL/rev nominal displacement and that the pump is bidirectional.

However, the currently accessible public material does not provide a sufficiently authoritative character-by-character coding chart for the entire C-F-Z-S suffix. Therefore, those letters are not assigned unsupported mechanical meanings here.

Key Technical Advantages

1. 12.5 mL/rev Fixed Displacement

The pump provides a nominal displacement of 12.5 mL/rev. At 2000 rpm, the theoretical geometric flow is:

12.5 × 2000 / 1000 = 25 L/min

Actual delivered flow depends on volumetric efficiency, pressure, temperature and hydraulic-fluid viscosity. The published model data specifies volumetric efficiency of at least 88%.

2. 20 MPa Rated Pressure

The CMW-F212.5-CFZS is specified for 20 MPa rated pressure, with 25 MPa maximum pressure, providing a suitable pressure class for many mobile and industrial hydraulic auxiliary circuits.

3. Bidirectional Operation

The official model-specific data identifies the pump as bidirectional. This enables applications requiring hydraulic power in both rotational directions and differentiates it from conventional unidirectional gear pumps.

4. 600–3000 rpm Operating Range

The published speed range is 600–3000 rpm, with a rated speed of 2000 rpm. This provides flexibility for mechanical drives and variable-speed hydraulic power systems.

5. Defined Mechanical Interface

The engineering drawing provides identifiable mechanical references including the Ø80 mm locating diameter, Ø103 mm body reference, 4 × Ø9.5 mm mounting holes and M14 × 1.5 thread features. These are valuable when engineering a replacement pump.

6. Proven HCHC Mobile-Hydraulic Application Base

HCHC’s public company information identifies its high-pressure gear pumps and motors for construction machinery, special vehicles, agricultural equipment and mining applications.

Application Areas

Typical applications include:

• Construction machinery auxiliary hydraulics
• Special-purpose vehicles
• Agricultural machinery
• Mining machinery auxiliary circuits
• Bidirectional hydraulic drive systems
• Mobile hydraulic power units
• Industrial auxiliary hydraulic stations
• Hydraulic actuator circuits
• Special-vehicle hydraulic systems
• Equipment requiring reversible hydraulic drive

Expert Maintenance Tips

1. Design the Circuit for Bidirectional Operation

Because the CMW-F212.5-CFZS is bidirectional, both working ports must be evaluated according to the actual direction of rotation and pressure cycle. Do not apply a conventional single-direction suction/pressure layout without checking the complete circuit.

2. Do Not Use 25 MPa as Continuous Design Pressure

20 MPa is the rated pressure; 25 MPa is the maximum pressure. The hydraulic system should be designed around the rated pressure rather than treating the maximum value as a normal continuous operating condition.

3. Commission at Low Speed

During initial commissioning, operate the pump at low speed and low load, verify stable priming and pressure generation, and only then increase speed and system load progressively.

4. Verify Shaft Alignment

The published drawing indicates a 1:5 tapered shaft. Check shaft alignment carefully during installation to minimize additional bearing and shaft-seal loads.

5. Verify All Mounting References During Replacement

Measure and confirm:

Ø80 mm locating diameter + Ø103 mm housing reference + 4 × Ø9.5 mm mounting holes + M14 × 1.5 features

before installing a replacement pump.

6. Maintain Hydraulic-Fluid Cleanliness

Contamination can accelerate wear of gears, bearings and sealing surfaces. Maintain the hydraulic filtration system according to the machine manufacturer’s requirements and inspect the fluid whenever abnormal noise or declining pump performance occurs.