Product Overview
The AP200/19 D 887-S and AP300/27-200/19 D 2887-S are high-performance external gear pumps from the Swiss manufacturer BUCHER Hydraulics AP series. Headquartered in Switzerland, BUCHER Hydraulics is a globally recognized manufacturer of hydraulic components, with the AP series renowned for its compact design, high efficiency, and long service life.
The AP200 series belongs to Group 2 (medium frame) with displacements ranging from 4.5 to 26 cc/rev. This series features a high-strength aluminum housing that delivers excellent heat dissipation and significant weight reduction, with operating pressure up to 250 bar.
The AP300 series belongs to Group 3 (large frame) with displacements ranging from 27 to 93 cc/rev. This series also features aluminum housing construction, with continuous operating pressure of 220 bar and peak pressure up to 280 bar.
The AP series supports single, double, and triple pump configurations, which can be assembled with specific displacements, flanges, and auxiliary valves. Products are manufactured in Switzerland and Italy, utilizing precision gear tooth CAD design and rigorous heat treatment processes to ensure excellent technical specifications and long service life.
Interchangeability: The AP series is manufactured to exacting BUCHER original design standards. Mounting flange, shaft type, port dimensions, and rotation direction are fully compliant with genuine BUCHER specifications, enabling 100% drop-in replacement without any system modification.
Technical Specifications
AP200/19 D 887-S
Brand: BUCHER Hydraulics (Switzerland)
Series: AP200
Group: Group 2 (medium frame)
Displacement: 19.0 cm³/rev
Continuous operating pressure: 250 bar
Peak pressure: 280 bar
Maximum speed: 4,000 rpm
Minimum speed: 500 rpm
Rotation: D = Right-hand (clockwise)
Seal code: 887-S = Standard NBR
Housing material: High-strength aluminum alloy
Construction: 3-piece aluminum housing
Media compatibility: Mineral-based hydraulic oils
Operating temperature range (NBR): -15°C to +80°C
Recommended viscosity range: 12 – 100 cSt
Recommended cleanliness: ISO 4406 19/17/14
Mounting interface: SAE standard flange
Country of origin: Italy
AP300/27-200/19 D 2887-S
Brand: BUCHER Hydraulics (Switzerland)
Series: AP300
Group: Group 3 (large frame)
Product type: Double pump (AP300/27 + AP200/19)
Section 1 displacement (AP300/27): 27.0 cm³/rev
Section 2 displacement (AP200/19): 19.0 cm³/rev
Continuous pressure (AP300/27): 220 bar
Peak pressure (AP300/27): 280 bar
Continuous pressure (AP200/19): 250 bar
Peak pressure (AP200/19): 280 bar
Maximum speed (AP300/27): 3,500 rpm
Maximum speed (AP200/19): 4,000 rpm
Minimum speed: 500 rpm
Rotation: D = Right-hand (clockwise)
Seal code: 2887-S
Housing material: High-strength aluminum alloy
Media compatibility: Mineral-based hydraulic oils
Operating temperature range (NBR): -15°C to +80°C
AP100 Series (Series Reference)
Brand: BUCHER Hydraulics (Switzerland)
Series: AP100
Group: Group 1 (small frame)
Displacement range: 1.2 – 10.0 cm³/rev
Continuous operating pressure: 210 bar
Peak pressure: 280 bar
Maximum speed: 5,000 rpm
Minimum speed: 500 rpm
Housing material: Aluminum
AP300 Series (Series Reference)
Brand: BUCHER Hydraulics (Switzerland)
Series: AP300
Group: Group 3 (large frame)
Displacement range: 27.0 – 93.0 cm³/rev
Continuous operating pressure: 220 – 150 bar (decreases with displacement)
Peak pressure: 280 – 200 bar (decreases with displacement)
Maximum speed: 3,500 – 2,500 rpm (decreases with displacement)
Minimum speed: 500 – 600 rpm
Housing material: Aluminum
Key Technical Advantages
1. Optimized Hydraulic Compensation for High Overall Efficiency
The AP series features optimized hydraulic compensation design, delivering exceptional volumetric and mechanical efficiency across the full operating pressure range. Precision CAD-designed gear tooth profiles and carefully calculated balancing areas effectively minimize internal leakage.
2. High-Strength Aluminum Housing and Lightweight Design
The high-strength aluminum housing delivers exceptional structural integrity while significantly reducing pump weight. The aluminum material offers excellent thermal conductivity, rapidly dissipating operating heat to effectively lower fluid operating temperatures. Both the front flange and end covers are also made of aluminum for overall weight reduction.
3. Precision Gear Design and Quiet Operation
The AP series utilizes precision CAD-designed gear tooth profiles, combined with careful selection of high-performance materials and rigorously controlled heat treatment processes. Optimized gear geometry and progressively tighter coupling tolerances achieve lower operating noise levels.
4. Modular Multi-Pump Design
The AP series supports single, double, and triple pump configurations. The AP300/27-200/19 is a double pump configuration, combining two pump sections connected by a common drive shaft to deliver two independent flow outputs. Each section can be configured with independent suction, meeting complex hydraulic system requirements for multiple flow outputs.
5. Long Service Life and High Reliability
BUCHER Hydraulics continuously improves its design, control, and manufacturing technologies while implementing rigorous quality control systems to ensure every product delivers the same high standard. Through careful material selection and rigorously controlled heat treatment processes, products offer excellent wear resistance and long service life.
6. Extensive Configuration Options and Customization Capability
The AP series offers multiple displacement options, flange types, shaft types, and port configurations. Supports dedicated back covers with integrated flow or pressure control valves, as well as dedicated front covers with outrigger bearings to improve mechanical performance and service life under radial/axial loads.
Application Areas
Construction Machinery – Excavators, loaders, bulldozers, and other mobile equipment hydraulic systems
Agricultural Machinery – Tractors, combine harvesters, front loaders, and other agricultural equipment
Material Handling Equipment – Forklifts, lift trucks, lifting platforms, and other handling machinery
Municipal Vehicles – Sweepers, garbage compactors, and other municipal vehicles
Industrial Hydraulic Power Packs – Machine tools, packaging machinery, and other stationary industrial equipment
Hydraulic Cranes – Lifting and hoisting equipment hydraulic systems
Earthmoving Machinery – Bulldozers, graders, and other earthmoving equipment
Expert Maintenance Tips
1. Fluid Cleanliness Management
AP series aluminum gear pumps are sensitive to fluid contamination. Recommended fluid cleanliness: ISO 4406 19/17/14 or higher. Install a suction filter with minimum 100 μm filtration and a return line filter with 10 μm filtration.
2. Fluid Viscosity & Temperature Control
Mineral-based hydraulic oils conforming to ISO/DIN standards are recommended. Operating viscosity should be maintained within 12 – 100 cSt. Optimal operating temperature: 40 – 60°C. AP series NBR seals allow operating temperatures from -15°C to +80°C. For higher temperature applications, FKM (Viton) seals are available, extending the temperature range to -15°C to +120°C.
3. Rotation Direction Verification
Always verify the pump rotation direction indicator before start-up (in AP series standard configurations, D = right-hand/clockwise). Start with jog operation to confirm correct rotation, then gradually load to operating pressure.
4. Alignment During Installation
Ensure concentricity between pump shaft and drive motor shaft does not exceed 0.05 mm, with angular misalignment within 0.5°. Flexible couplings are recommended to compensate for minor misalignment. SAE flange installation requires proper bolt torque according to specifications.
5. Double Pump Installation Considerations
The AP300/27-200/19 is a double pump configuration with two sections connected by an internal drive shaft. Pay special attention to alignment and secure fastening between sections during installation. Suction lines for each section should be kept independent or symmetrically arranged to ensure uniform flow distribution.
6. First Start-Up and Bleeding
Before initial start-up, pre-lubricate the pump by filling clean hydraulic oil through the housing ports. After start-up, run the pump in no-load operation for a few seconds to ensure sufficient lubrication. The pump must be bled before building up system pressure. Never allow the pump to run without oil.
7. Periodic Maintenance
Replace hydraulic oil and filters every 2,000 operating hours or annually. Regularly monitor pump body temperature (surface temperature should not exceed 80°C) and listen for abnormal noise increases, which may indicate internal wear or cavitation. When servicing aluminum housing pumps, take extra care to avoid damaging sealing surfaces during disassembly.
