Product Overview
The CP0-08-P-10R, CP0-10-P-10R, and CP0-20-P-10R are representative models of the CP0 series gap-compensated fixed-displacement internal gear pumps. The CP0 series features axial and radial pressure compensation, maintaining high volumetric efficiency even under low-speed and low-viscosity conditions.
The CP0 series housing is manufactured from high-strength cast iron, with a unique internal noise-reduction design that delivers ultra-low noise operation. The series offers extremely low flow and pressure pulsation, maintaining stable flow and pressure output even at low speeds. Maximum operating pressure reaches 35 MPa (350 bar) , with maximum speeds up to 3000 r/min.
The CP0 series is widely used in hydraulic systems for injection molding machines, die casting machinery, shoe machinery, and electric forklifts, and is particularly suitable for servo variable-frequency drive energy-saving systems. Engineered as a direct OEM-replacement solution, the CP0 series fully complies with ISO 3019-1 SAE 2-bolt flange mounting specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.
Model Code Breakdown
CP — Series: Internal Gear Pump
0 — Frame size: CP0 Series (8–20 cc/rev displacement group)
08 / 10 / 20 — Displacement code: 8.2 / 10.2 / 20.0 cc/rev respectively
P — Shaft type: Plain key shaft
10R — Design series and rotation code (R = Clockwise, viewed from shaft end)
Technical Specifications
CP0-08-P-10R Specifications
Model: CP0-08-P-10R
Series: CP0 Internal Gear Pump
Displacement: 8.2 cc/rev
Maximum Operating Pressure: 35 MPa (approx. 350 bar)
Rated Pressure: 32 MPa (approx. 320 bar)
Speed Range: 600 – 3000 r/min
Flow Rate (@1500 rpm): Approx. 12.2 L/min
Rotation Direction: Clockwise (viewed from shaft end)
Flange Standard: ISO 3019-1 SAE 2-bolt flange
Shaft Type: Plain key shaft (P)
Seal Options: FKM (V) / NBR (W)
Housing Material: High-strength cast iron
Weight: Approx. 4.6 kg
Moment of Inertia (about drive shaft): 0.00018 kg·m²
Circuit Type: Open circuit
Fluid Cleanliness: ISO 4406 Class 20/18/15
CP0-10-P-10R Specifications
Model: CP0-10-P-10R
Series: CP0 Internal Gear Pump
Displacement: 10.2 cc/rev
Maximum Operating Pressure: 35 MPa (approx. 350 bar)
Rated Pressure: 32 MPa (approx. 320 bar)
Speed Range: 600 – 3000 r/min
Flow Rate (@1500 rpm): Approx. 15.1 L/min
Rotation Direction: Clockwise (viewed from shaft end)
Flange Standard: ISO 3019-1 SAE 2-bolt flange
Shaft Type: Plain key shaft (P)
Seal Options: FKM (V) / NBR (W)
Housing Material: High-strength cast iron
Weight: Approx. 4.8 kg
Moment of Inertia (about drive shaft): 0.00019 kg·m²
Circuit Type: Open circuit
Fluid Cleanliness: ISO 4406 Class 20/18/15
CP0-20-P-10R Specifications
Model: CP0-20-P-10R
Series: CP0 Internal Gear Pump
Displacement: 20.0 cc/rev
Maximum Operating Pressure: 35 MPa (approx. 350 bar)
Rated Pressure: 32 MPa (approx. 320 bar)
Speed Range: 600 – 3000 r/min
Flow Rate (@1500 rpm): Approx. 29.6 L/min
Rotation Direction: Clockwise (viewed from shaft end)
Flange Standard: ISO 3019-1 SAE 2-bolt flange
Shaft Type: Plain key shaft (P)
Seal Options: FKM (V) / NBR (W)
Housing Material: High-strength cast iron
Weight: Approx. 5.6 kg
Moment of Inertia (about drive shaft): 0.00037 kg·m²
Circuit Type: Open circuit
Fluid Cleanliness: ISO 4406 Class 20/18/15
Key Technical Advantages
1. Axial & Radial Pressure Compensation – High Efficiency & Low Leakage
The CP0 series features advanced axial and radial pressure compensation design, with axial sealing achieved through front and rear distribution plates, and radial sealing through compensation elements (crescent sub-plate, crescent main plate, and plastic rod). High volumetric efficiency is maintained even under low-speed and low-viscosity conditions. The pressure field on the back of the axial washers balances them against the displacement area, achieving perfect sealing with low mechanical losses.
2. Ultra-Low Noise & Low Pulsation Operation
High-strength cast iron construction and a unique internal noise-reduction design deliver exceptionally low noise levels. The optimized internal gear design ensures extremely low flow and pressure pulsation, maintaining stable flow and pressure output even at low speeds.
3. Superior High-Pressure Capability
Maximum operating pressure reaches 35 MPa (350 bar) . The high-strength cast iron housing and precision internal gear design ensure long-term stability under high-pressure conditions.
4. Wide Speed Range – Strong Adaptability
Speed range of 600 – 3000 r/min with maximum speeds up to 3000 r/min. Accommodates various drive conditions from low to high speeds, and is particularly suitable for servo variable-frequency drive energy-saving systems.
5. Low Contamination Sensitivity – Long Service Life
The CP0 series internal gear pumps are insensitive to fluid contamination, offering long service life. Compared to external gear pumps, the internal gear design delivers lower wear rates and longer maintenance intervals.
6. Flexible Configuration Options
The CP0 series offers multiple displacement options (8/10/13/16/20 cc/rev). Both plain key shaft (P) and spline shaft (S) options are available. Seals can be specified as FKM (V) or NBR (W) . Rotation direction supports clockwise (R) or counter-clockwise (upon request).
7. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with ISO 3019-1 SAE 2-bolt flange mounting specifications, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.
Application Areas
The CP0 series internal gear pumps are widely used in the following equipment and systems:
Injection Molding Machines: Stable, low-pulsation hydraulic power for injection, clamping, and other processes
Die Casting Machinery: High-pressure, high-flow hydraulic systems
Shoe Machinery: Hydraulic systems for various shoe manufacturing equipment
Electric Forklifts: Hydraulic systems for material handling equipment
Servo Variable-Frequency Drive Systems: On-demand oil supply with servo drive for energy-efficient operation
Industrial Hydraulic Systems: Hydraulic power units for various industrial equipment
Expert Maintenance Tips
1. Model Confirmation
CP0-08-P-10R offers 8.2 cc/rev, CP0-10-P-10R offers 10.2 cc/rev, and CP0-20-P-10R offers 20.0 cc/rev displacement. The CP0 series also includes CP0-13-P-10R (13.3 cc/rev) and CP0-16-P-10R (16.0 cc/rev). Before installation, confirm the correct displacement based on system flow requirements and verify the complete model code on the pump nameplate.
2. Rotation Direction Confirmation
The standard model features clockwise rotation (viewed from shaft end). Counter-clockwise versions are available upon request. Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to internal components within a short period.
3. Installation Precautions
Mounting flange standard: ISO 3019-1 SAE 2-bolt flange
Shaft type: Plain key shaft (P)
Use specified torque values for mounting bolts—avoid over-tightening which may cause distortion of the cast iron housing
Ensure correct connection of inlet and outlet ports
Direct drive with flexible coupling is recommended—avoid subjecting the pump to axial or radial loads
The pump shaft is designed for adjusted radial and axial forces only (e.g., belt pulley applications)
4. First Start-Up and Bleeding
Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry
After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system
Check for abnormal noise or leakage—internal gear pumps are particularly sensitive to cavitation
5. Fluid and Filtration
Recommended fluid: ISO VG46 anti-wear hydraulic oil
Compatible fluids: HLP mineral oil (DIN 51524 Part 2), HFC water-glycol solutions, HEES synthetic ester hydraulic fluids, HFD-U hydraulic fluids
Hydraulic oil temperature range: -10℃ to +80℃ (HLP)
Ambient temperature range: -10℃ to +50℃
Viscosity range: 10 – 300 mm²/s (up to n=2000 r/min); 10 – 100 mm²/s (up to n=3000 r/min)
Fluid cleanliness: ISO 4406 Class 20/18/15
Regularly replace return line filters to prevent contaminants from entering the pump
6. Periodic Maintenance
Check mounting bolt torque every 1,000 operating hours
Regularly monitor system operating pressure—CP0 series not to exceed 35 MPa (350 bar) peak pressure
Internal gear pumps are known for long service life and low maintenance requirements—nevertheless, regularly inspect shaft seals to prevent leakage
If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly
