Casappa AP300 Series Gear Pump Replacement | High-Pressure Hydraulic Pump

Genlu Hydraulic proudly introduces our industrial-grade AP Series high-pressure external gear pumps. This series is fully engineered to match global standards, providing a seamless, high-value drop-in replacement for Casappa AP original equipment, covering the complete AP100, AP200, and AP300 displacement ranges. We specifically highlight our supply capability for high-performance units such as the AP300/93 S 218 and AP300/93 S 818.

As the “power heart” of fluid power systems, the AP300 series gear pumps are renowned for high volumetric efficiency and elite durability under intensive loading. Genlu guarantees 100% Drop-in Interchangeability across SAE mounting flanges, drive shaft splines, porting dimensions, and internal pressure-compensation architectures compared to original Casappa assemblies. Every pump undergoes 100% full-pressure load stability and volumetric calibration on our digital test benches, certifying consistent, high-torque output for critical duty cycles.

Technical Specifications 

• Product Series: Casappa AP300 Series High-Pressure External Gear Pump

• Representative Models: AP300/93 S 218, AP300/93 S 818

• Geometric Displacement: 93.1 cc/rev

• Nominal Operating Pressure: 250 bar (Continuous)

• Peak Transient Pressure: 300 bar

• Maximum Rated Speed: 2500 rpm

• Pump Architecture: Pressure-compensated external gear design

• Drive Shaft Specification: Standard SAE Splined Shaft

• Compatible Hydraulic Fluids: Mineral hydraulic oils, anti-wear fluids

• Approximate Unit Weight: 16.5 kg

Key Technical Advantages:

• Axial Pressure Compensation Logic: Precision-engineered compensation plates dynamically adjust side-clearances in response to system pressure. This maximizes volumetric efficiency by minimizing internal leakage at high-load stages.

• High-Rigidity Pump Housing: Constructed from forged high-strength aluminum alloy, the pump housing provides superior torsional rigidity and thermal conductivity, ensuring shape stability even at 300 bar peak pressure.

• Precision-Ground Gear Profiles: Gear teeth are ground to ultra-high-precision involute profiles, reducing mesh vibrations and resulting in exceptionally smooth, quiet operation in sensitive industrial environments.

• Heavy-Duty Bearing System: Equipped with high-load, wear-resistant needle bearings, the rotating group maintains shaft alignment under intense cyclical loading, significantly reducing mechanical wear from shaft deflection.

Application Areas:

• Construction Machinery: Auxiliary pumps for excavators and power units for compact loaders.

• Agricultural Equipment: Tractor hydraulic linkage systems and harvester auxiliary circuits.

• Industrial Power Packs: Industrial presses and high-pressure hydraulic test benches.

Expert Maintenance Tips:

• Prevent Inlet Cavitation: High-pressure gear pumps require unrestricted suction flow. Ensure inlet piping is airtight and properly sized, and periodically check suction filters for blockages, as cavitation is the leading cause of early-stage gear-tip wear.

• Enforce Fluid Cleanliness Standards: Maintain system fluid cleanliness at ISO 4406 18/16/13. Metallic particulate ingress is the primary cause of scoring on compensation plates; regular oil analysis is highly recommended.

• Perform Initial Priming: Manually fill the pump with clean hydraulic fluid through the highest port before mounting. Operate under no-load conditions for 5-10 minutes to purge system air completely; aeration is the primary cause of performance degradation and must be strictly avoided.