AP300/27 D 218 Bucher Gear Pump AP Series High Pressure

Product Overview

The AP300/27 D 218 and AP200/19 D 225 are high-pressure external gear pumps from the Bucher Hydraulics AP series (covering AP100, AP200 and AP300). The AP300/27 D 218 features a displacement of 27 cm³/rev with clockwise rotation (D) and standard 218 flange configuration; the AP200/19 offers approximately 18.9 cm³/rev. Constructed with an aluminum alloy body and cast-iron covers, these pumps incorporate optimized hydraulic compensation for high volumetric efficiency, low noise and long service life. They provide direct bolt-on interchangeability with OEM units and undergo 100% simulated duty testing for reliable performance in excavator auxiliary systems and other mobile/industrial applications.

Technical Specifications 

• Models: AP300/27 D 218 (primary); AP200/19 D 225 (related series)
• Pump type: External gear pump
• Displacement (AP300/27): 27.0 cm³/rev (1.674 in³/rev)
• Displacement (AP200/19): 18.9 cm³/rev
• Continuous pressure P1 (AP300/27): 220 bar (3150 psi)
• Intermittent pressure P2 (AP300/27): 250 bar (3600 psi)
• Peak pressure P3 (AP300/27): 280 bar (4000 psi)
• Minimum speed: Approx. 600–800 rpm
• Maximum speed: 3000–3500 rpm (pressure-dependent)
• Rotation: D = Clockwise
• Materials: Aluminum alloy body, cast-iron front/rear covers, standard NBR seals
• Series: AP300 (family includes AP100, AP200, AP300 with wide displacement range)
• Other: Recommended for mineral oil-based hydraulic fluids, viscosity 20–120 cSt (recommended), cleanliness per ISO 4406

Key Technical Advantages

1. True drop-in interchangeability: Manufactured to OEM dimensional and porting standards for bolt-on replacement without modifications, minimizing downtime.
2. High volumetric efficiency: Optimized hydraulic compensation design minimizes internal leakage for consistent flow and pressure output.
3. Robust construction & durability: Lightweight aluminum body with high-strength cast-iron covers and precision gears/plain bearings for continuous duty.
4. Low noise and wide speed range: Smooth operation with maximum speeds up to 3500 rpm, suitable for excavator auxiliary circuits and varied applications.
5. 100% simulated duty testing: Full pressure, flow, noise and endurance verification before shipment ensures ready-to-install reliability.

Application Areas

• Excavator auxiliary hydraulic systems (fan, steering, implement circuits)
• Construction and earth-moving machinery
• Agricultural equipment, loaders and forklifts
• Hydraulic power units and industrial systems
• Mobile and stationary applications requiring medium-to-high pressure external gear pumps

Expert Maintenance Tips

• Confirm clockwise rotation (D) and flange interface before installation; use recommended mineral oil-based fluids and maintain proper viscosity and cleanliness.
• Start at low speed unloaded; check for leaks and noise. Avoid simultaneous maximum pressure and maximum speed.
• Regularly inspect seals and bearings; ensure unrestricted suction lines to prevent cavitation.
• Follow recommended pressure-line velocities; keep oil temperature within –15 to +80 °C (peak –20 to +90 °C).
• For multi-pump assemblies or special flange versions, verify the exact order code and consult technical support.