KF Series Gear Pump | KRACHT KF63RF1 KF50RF1 KF80RF1 Replacement

Genlu Hydraulic specializes in the precision engineering, advanced manufacturing, and global supply of industrial-grade low-pressure, high-viscosity transfer and lubrication gear pumps. The KF Series Low-Pressure High-Viscosity Hydraulic Gear Pump is engineered as a robust, micro-tolerance, and 100% drop-in interchangeable alternative to the definitive global benchmark KRACHT classic KF series transfer and lube pump lines. We provide comprehensive engineering and quick-ship supply for all definitive frame displacements and custom variations, prominently delivering premium replacement assemblies for KF5RF1, KF25, KF40, KF50RF1, KF50BF1, KF63RF1, KF80RF1, KF112, and KF500RF1 configurations, as well as specialized modular builds with valve/flange designations such as KF-F112RG15, KF-F25RF2, and KF-F40RF2.

Serving as the primary circulation core for heavy industrial gearbox lubrication skids, marine diesel fuel delivery, and fluid cooling loops, a transfer pump’s priming reliability across severe viscosity matrices (including heavy gear oils, crude fuel, and thermal oils) determines system operational life. Genlu’s KF series gear pumps conform precisely to original manufacturer dimensions across standard square or rhombic mounting flanges, parallel keyed drive shafts, port-to-port dimensions, and the signature pressure relief control valves. Prior to dispatch authorization, every single assembly undergoes 100% Full-Simulation Condition Testing on a high-viscosity electronic test bay. This process verifies displacement stability, continuous low-noise output, and peak vacuum limits across a wide range of oil temperatures.

Technical Specifications 

• Product Line: KF Series Industrial High-Viscosity Lubrication & Fluid Transfer Gear Pump (Fully compatible with KRACHT KF series)

• Core Covered Models:

  • KF5RF1 Layout (Geometric Displacement: 5.0 $cc/rev$)

  • KF-F25RF2 / KF-F40RF2 Platforms (Medium frame displacement with customized porting flanges)

  • KF50RF1 / KF50BF1 Layouts (Geometric Displacement: 50.0 $cc/rev$)

  • KF63RF1 Layout (Geometric Displacement: 63.0 $cc/rev$)

  • KF80RF1 Layout (Geometric Displacement: 80.0 $cc/rev$)

  • KF-F112RG15 Configuration (High-volume lubrication build with pressure regulation mechanisms)

  • KF500RF1 Layout (Super-large frame displacement: 500.0 $cc/rev$)

• Continuous Operating Pressure Limit: 25 bar to 40 bar (2.5 MPa to 4.0 MPa / up to 580 psi, depending on model constraints)

• Fluid Viscosity Adaptability Bandwise: 12 to 20,000 $mm^2/s$ (cSt, optimized for severe cold-start self-priming)

• Maximum Permissible Media Temperature: 90°C (194°F) as standard; up to 200°C (392°F) for custom magnetic drive or high-temp viton variations

• Safety & Regulatory Overrides: Modular built-in pressure-relief safety valve (DBV) with optional single or bi-directional venting paths

• Rotational Orientation Codes:

  • R – Clockwise Orientation (CW)

  • L – Counter-Clockwise Orientation (CCW)

  • B – True Bi-directional Valve Layout (Maintains fixed, un-reversed inlet/outlet flow regardless of shaft rotation direction)

• Main Shaft Seal Design Suffixes: F1 / F2 / G15 (Denoting standard dynamic rubber lip seals, heavy mechanical seals, or specialized fluid-return chamber isolation rings)

• Casing Metrological Integrity: High-density Ductile Iron Housing (EN-GJS-400 grade) with ground alloy steel helical gearing elements

Key Technical Advantages:

• Precision-Ground Helical Gearing Elements: Unlike low-cost spur-gear alternatives, Genlu’s KF pumps feature helical gears engineered via computational fluid dynamics. The specialized tooth angle achieves maximum overlap during gear meshing, eliminating fluid trapping and pulsations. This ensures uniform flow delivery and exceptionally quiet operation (typically below 60 dB), even when running high-viscosity fluids.

• High-Tensile Ductile Iron Housing with Vacuum Nitriding: The main housing is cast from high-grade nodular iron for superior wear resistance and fatigue life under fluctuating pressures. The gear shafts and matching bushings undergo vacuum ion nitriding and case hardening, creating a hard surface layer that resists scoring even if the fluid contains fine particulates or has low inherent lubricity.

• Internal Pressure-Balanced Back-Pressure Bypass Channels: Features a fluid design that manages internal axial and radial forces. To prevent external shaft seal weeping, Genlu optimized the return-leakage channels inside the F1/F2 seal chambers. These channels route high-pressure accumulation away from the seal lip and back to the suction side, keeping the shaft seal in a low-pressure, low-temperature zone to extend its lifespan.

• True Bi-Directional Adaptability with Integrated Safety Relief: Designed for follow-up lubrication applications like wind turbine gearboxes or marine propulsion shafts, our KF50BF1 offers a bi-directional valve core that automatically switches fluid paths based on shaft rotation. This feature ensures consistent inlet and outlet directions while the integrated safety relief valve protects the system from overpressurization if a line becomes blocked.

Application Areas:

• Heavy Duty Central Lubrication Stations: High-capacity lubrication skids for cement ball mills, steam turbine main bearings in power plants, and oil circulation for wind turbine step-up gearboxes.

• Bulk Fuel, Crude & Industrial Fluid Logistics: Low-pressure heavy fuel oil booster loops for marine diesel engines and fast oil-bulk transfer or offline filtration systems for mineral lubricants and transformer oils.

• Industrial Machinery Manufacturing: Automated slider-way lubrication for large milling beds and continuous independent offline oil cooling/filtering loops.

Expert Maintenance Tips:

• Verify Rotational Direction Codes (R vs. L vs. B): Kracht configurations are highly specific. For example, KF50RF1 designates a single-direction clockwise pump, whereas KF50BF1 features internal fluid routing for bi-directional rotation. Always check the motor rotation before starting installation. Installing a single-direction pump on a reversing shaft prevents it from building pressure and can cause the internal components to seize from lack of lubrication within a minute.

• Optimize Suction Plumbing for High-Viscosity Media: High-viscosity fluids generate high flow friction. Ensure the suction line diameter is equal to or larger than the pump’s inlet port and keep the line as short as possible. Avoid using restrictive, fine-mesh suction strainers (a coarse filter of 150 microns or greater is recommended) to prevent fluid cavitation, knocking noises, and premature gear damage.

• Initial Casing Pre-Lubrication & Relief Valve Calibration: Before connecting the piping and starting the pump for the first time, remove the port flanges and fill the internal pump chamber with clean system oil to protect the main bearings and gear faces. For models with built-in relief valves, monitor an in-line pressure gauge during initial startup and use the hex