AP200/19 & AP300 Series Hydraulic Gear Pump | High Pressure Casappa Replacement | AP300/27/31/38/45/53/63/75

LIC Hydraulic’s AP200 and AP300 Series are high-performance external gear pumps engineered for demanding high-pressure hydraulic circuits. Designed with a high-strength extruded aluminum body and robust cast iron end-covers, models such as AP200/19 and the AP300/27 through 75 range offer an exceptional power-to-weight ratio. These units provide 100% drop-in interchangeability with Casappa standards. Each pump undergoes a rigorous 100% load-testing protocol to ensure peak efficiency, consistent pressure delivery, and whisper-quiet operation in harsh mobile applications.

Technical Specifications

• Series: AP200 (Medium Flow) / AP300 (High Flow)

• Common Models: AP200/19, AP300/31, AP300/45, AP300/63, AP300/75

• Displacement Range:

  • AP200: 14.41 to 22.94 cm³/rev

  • AP300: 26.7 to 73.82 cm³/rev

• Rated Pressure: 250 bar (3625 psi)

• Peak Pressure: Up to 300 bar (4350 psi)

• Max Speed: 2500 – 3500 rpm (Model dependent)

• Rotation: S (Counter-Clockwise) / D (Clockwise)

• Mounting: Standard SAE or European 4-bolt flanges (e.g., 818/838)

• Drive Shaft: FP (Splined or Parallel with front bearing support)

• Body Material: High-tensile extruded aluminum alloy

Key Technical Advantages

• Pressure-Resistant Reinforced Build: The three-piece construction with cast iron covers prevents housing expansion under extreme pressure spikes, maintaining internal alignment and efficiency.

• Axial Pressure Compensation: Floating thrust plates automatically adjust for clearance based on operating pressure, compensating for thermal growth and mechanical wear to maintain over 95% volumetric efficiency.

• Heavy-Duty DU Bushings: High-precision DU composite bearings provide superior dry-start protection and resistance to contamination, significantly extending service life under high-vibration loads.

• Low-Noise Gear Geometry: Precision-ground gear sets with optimized profiles minimize flow ripple, delivering smooth power transmission and keeping noise levels below 75dB(A).

Application Areas

• Agricultural Machinery: Tractor lift systems, harvester headers, and auxiliary drives.

• Construction Equipment: Excavator pilot pumps, skid steer loaders, and asphalt milling machines.

• Material Handling: Heavy-duty forklift lift circuits and truck tailgate power units.

• Forestry Equipment: Feller buncher control systems and grapple drives.

Expert Maintenance Tips

• Pre-Start Priming: Always manually prime the pump with clean hydraulic fluid before the initial run. Rotate the shaft by hand to ensure the shaft seal and gear faces are lubricated.

• Inlet Vacuum Integrity: For high-displacement AP300 pumps, ensure the suction line is perfectly sealed. Any air ingestion will lead to cavitation, resulting in metallic pitting and sudden failure.

• Filtration Standard: To maximize durability, maintain fluid cleanliness at ISO 18/16/13. Aluminum-body pumps are sensitive to abrasive particles; therefore, high-quality 10-micron filtration is strongly recommended.