Hydraulic Gear Pump Catalogue: Comprehensive Selection Guide

 hydraulic gear pump catalogue form the reliable core of fluid power systems, converting mechanical energy into hydraulic flow with precision and durability. Catalogues serve as essential roadmaps, detailing specifications across series like group 1, 2, and 3 pumps to match applications from compact machinery to heavy industrial setups. Organized by displacement, pressure ratings, mounting flanges, and shaft configurations, these guides enable engineers to select optimal models ensuring efficiency, longevity, and system integration.

Design Fundamentals and Operating Principles

Gear pumps operate on positive displacement, where two meshed gears—drive and idler—trap fluid in pockets between teeth and the housing, forcing it to the outlet. External gear designs dominate catalogues, offering simplicity and cost-effectiveness. Displacements range from 0.6 cm³/rev for mini pumps to 150 cm³/rev for high-flow units, directly dictating output: flow (L/min) = displacement (cm³/rev) × speed (RPM) / 1000.

Volumetric efficiency averages 90-95%, mechanical 85-92%, yielding overall totals above 80%. Max pressures span 200-350 bar continuous, with peaks to 420 bar. Speeds cap at 6000 RPM for small bores, 1800 RPM for larger to manage heat and wear. Inlet pressures hold 0.7-3 bar absolute; back pressures limit to 5-8 bar on motors. Viscosity suits 10-1000 cSt, with 32 cSt optimal.

Series and Displacement Breakdown

Catalogues group pumps by frame size. Group 1 (F1/GP1) covers 0.8-9 cm³/rev for tractors and winches. Group 2 (F10/GP2) scales to 12-41 cm³/rev, suiting loaders—KP20- 14 hits 265 bar at 3000 RPM. Group 3 (F20/GP3) reaches 98 cm³/rev for trucks.

HI/LO combos like CBNF deliver low-flow/high-pressure stages, auto-shifting at 40-50 bar for log splitters. Tandem stacks multiply circuits: front 20 cm³/rev feeds steering, rear 10 cm³/rev lifts. Bi-rotational pumps reverse via symmetric gears, ideal for reversible drives.

Mounting, Shaft, and Port Options

SAE flanges standardize: A (4-bolt 37 mm BC) for group 1, B (52 mm BC) group 2, C/D (larger) for group 3. European DIN 5462 rectangular flanges alternate. Shafts include SAE splines (11T A, 14T B), straight keys (6-25 mm), or involutes.

Ports feature G/PT threads, SAE O-rings (#6 to #24), or flanges. Lengths grow predictably: single group 2 at 90-120 mm, triples to 250 mm. Weights: 1.5 kg group 1 aluminum, 12 kg cast iron group 3.

Torque limits guide drives: 30 Nm group 1, 360 Nm group 3. Seals: NBR standard (-20°C to 80°C), Viton to 120°C.

Performance Data and Selection Charts

Nomographs plot flow vs. pressure vs. speed, shading efficient zones. Example: 22 cm³/rev at 2500 RPM yields 33 LPM at 210 bar, power input 7 kW. Efficiency curves peak mid-range, dropping at extremes.

Multiple pumps derate by drive torque—front governs ratings. Accessories list priority valves, filters (25 µm), and coolers.

Materials and Durability Features

Aluminum bodies lighten 40% vs. cast iron, suiting mobile gear; iron endures 20% higher pressures. Gears cut from ACM, bushes bronze or iron. Thrust plates balance axial loads.

Life exceeds 5000 hours with clean ISO 18/16/13 oil. Reversible T2 flanges allow field rotation swaps.

Application-Specific Recommendations

Agriculture favors group 2 PTO pumps (56-160 cm³/rev, 540 RPM). Construction selects stackables for multi-function. Marine pumps add shaft seals for dry running.

Industrial presses demand compensated axial designs boosting efficiency 5%. Electrified variants pair with 24/48V motors.

Maintenance, Sizing, and Custom Options

Priming tips, torque specs (80 Nm B-mounts), and alignment checks feature prominently. Cross-references match Bosch Rexroth, Eaton.

Customs include integrated valves, special ports, or gold plating for synthetics.

Conclusion

hydraulic gear pump catalogue empower precise system design, balancing flow, pressure, and footprint for peak performance. Their structured data transforms complexity into confident choices across industries. As hydraulic-electro hybrids rise, evolving catalogues will highlight smart sensors and eco-fluids, sustaining gear pumps' role as fluid power workhorses.