KF63RF1 KRACHT Gear Pump 63.18 cc/rev 25 Bar

Product Overview

The KRACHT KF63RF1 is a fixed-displacement external gear pump from the KRACHT KF Transfer Pump series, designed primarily for fluid transfer and oil-supply applications such as lubrication, fuel delivery and industrial circulation systems.

An important technical clarification is required: the KF63RF1 is not part of KRACHT’s high-pressure KP gear pump family. KRACHT officially classifies KF products as Transfer Pumps, with a broad displacement range and a maximum pressure of 25 bar. The KRACHT KP series is the dedicated high-pressure gear pump family, with maximum pressure up to 300 bar.

For the specific KF63RF1 configuration, published technical records identify a geometric displacement of approximately 63.18 cm³/rev, with a grey cast iron housing, case-hardened steel gears, multi-layer plain bearings and a radial shaft seal. Configurations with the D-valve provide directly controlled pressure protection within a 0–15 bar adjustment range.

For replacement applications, displacement alone is not sufficient. Rotation, mounting flange, shaft diameter, port connection, sealing arrangement and valve configuration must all be matched to the original pump.

We support in-place interchangeability projects by matching the original mechanical and hydraulic configuration and conducting 100% simulated working-condition testing before shipment.

Technical Specifications

• Brand: KRACHT
• Series: KF Transfer Pumps
• Model: KF63RF1
• Pump Type: Fixed-displacement external gear pump
• Geometric Displacement: 63.18 cm³/rev
• Maximum Operating Pressure: 25 bar
• Speed Range: 200–3600 rpm, depending on pressure, viscosity and drive power
• Rotation: Right-hand rotation, viewed from the shaft end
• Mounting: DIN flange
• Shaft: Cylindrical shaft, Ø24 mm
• Port Connection: SAE 1½-inch flange connection
• Outboard / Front Bearing: None
• Bearing: Multi-layer plain bearing
• Gear Material: Case-hardened steel
• Housing Material: Grey cast iron EN-GJL 250
• Integrated Valve: D-valve, 0–15 bar configuration
• Seal Material: NBR
• Shaft Seal: Radial shaft seal
• Fluid Temperature: -20°C to +90°C for the referenced KF63RF1 configuration
• Ambient Temperature: -20°C to +60°C
• Minimum Viscosity: 1.4 mm²/s at up to approximately 3 bar; 6 mm²/s at up to approximately 12 bar; 12 mm²/s at maximum operating pressure
• Weight: Not published by the official KRACHT public product page for the complete KF63RF1 configuration; no estimated value is used as an engineering specification.

Theoretical Flow Calculation

Theoretical flow can be estimated using:

Q ≈ Vg × n / 1000

For a geometric displacement of 63.18 cm³/rev:

• 1000 rpm: approximately 63.18 L/min
• 1500 rpm: approximately 94.77 L/min
• 2000 rpm: approximately 126.36 L/min
• 3000 rpm: approximately 189.54 L/min
• 3600 rpm: approximately 227.45 L/min

These values represent theoretical displacement flow, not guaranteed delivered flow. Actual flow depends on volumetric efficiency, pressure, viscosity, temperature and inlet conditions.

Key Technical Advantages

1. Large Fixed Displacement

With a geometric displacement of 63.18 cm³/rev, the KF63RF1 is suitable for fluid transfer and lubrication systems requiring relatively high flow from a compact external gear pump.

2. Case-Hardened Steel Gearing

The KF standard design uses case-hardened steel gears. Surface hardening improves gear tooth wear resistance while maintaining suitable core toughness for continuous rotary operation.

3. Robust Cast Iron Housing

The KF63RF1 configuration uses EN-GJL 250 grey cast iron for the housing, providing high structural rigidity and good resistance to vibration and dimensional deformation in industrial service.

4. Multi-Layer Plain Bearing System

The multi-layer plain bearing arrangement supports the gear shafts while maintaining controlled running clearances. Bearing condition is directly related to internal leakage, mechanical losses and service life in an external gear pump.

5. Helical Gearing for Lower Noise and Pulsation

KRACHT states that its standard KF pumps use helical gearing combined with specialized tooth geometry to achieve low noise and low pressure pulsation. This is particularly beneficial for continuously operating lubrication systems and engine oil-supply applications.

6. Modular Configuration Platform

The KF platform supports different shaft seals, valve options, bearing arrangements, rotation configurations and connection variants. KRACHT also provides multiple-pump combinations such as KF + KF and KF + KP for systems requiring multiple independent flow circuits.

7. Optional Integrated Pressure Protection

KF pumps can be equipped with D-valves, T-valves, Universal Valves or SPV/DV valves. The D-valve is a directly controlled pressure-relief solution intended to protect the pump from impermissible pressure peaks. This does not make the KF pump itself a high-pressure pump.

Application Areas

According to KRACHT’s official KF product information, typical applications include:

• Marine gearbox lubrication
• Wind turbine gearbox lubrication
• Compressor lubrication
• Diesel engine pre-lubrication
• Main diesel engine lubrication
• Filter-system oil delivery
• Fuel delivery and transfer
• Industrial circulation lubrication systems
• Low-pressure oil transfer in mobile and stationary equipment

KRACHT specifically identifies marine gearboxes, wind turbines, compressors, diesel engines, filter systems and fuel delivery among the KF series applications.

Other KF Models in the Original Search Title

The original product title also includes:

• KF50RF1
• KF80RF1
• KF-F112RG15
• KF-F25RF2
• KF-F40RF2
• KF5RF1
• KF50BF1
• KF500RF1

These models should not share a single specification block with KF63RF1.

Verified examples include:

• KF80RF1: geometric displacement 80.50 cm³/rev, DIN flange, Ø24 mm cylindrical shaft, SAE 1½-inch flange connection, right-hand rotation, 25 bar maximum operating pressure and 200–3000 rpm speed range.
• KF500RF1: geometric displacement 496.50 cm³/rev, SAE 4-inch flange, Ø38 mm cylindrical shaft, right-hand rotation, 25 bar maximum operating pressure and 200–2000 rpm speed range.
• KF50BF1/285: this configuration appears in KRACHT-related project/product records, but the complete interface and pressure specification should be confirmed from the full ordering code.
• KF-F25RF2, KF-F40RF2 and KF-F112RG15: these are identifiable within the KF product family, but the publicly indexed information reviewed here does not establish complete engineering data for the exact shortened codes supplied in the title. Therefore, displacement, pressure and speed are not fabricated. Different full suffixes such as /158 and /232 exist and may represent materially different configurations.

Expert Maintenance Tips

1. Maintain Proper Suction Conditions

Positive-displacement gear pumps are sensitive to inlet restrictions. As speed increases, the permissible inlet condition becomes more restrictive. Proper suction-line sizing is essential to avoid cavitation and insufficient filling.

2. Do Not Treat 25 Bar as a Universal Continuous Rating

The KF family maximum pressure is 25 bar, but the permissible pressure at a specific operating point depends on speed, viscosity, fluid temperature and drive power. The complete duty cycle must be checked before continuous operation at elevated pressure.

3. Prime the Pump Before High-Speed Operation

Before commissioning, make sure the pump chamber and suction line are filled with the operating medium. Running an external gear pump dry can rapidly increase wear of the gears, bearings and shaft seal.

4. Maintain High Fluid Cleanliness

Contaminants accelerate wear on gear teeth, journals, bearing surfaces and internal clearances. Filter condition should therefore be included in the preventive-maintenance program for marine, diesel-engine and industrial lubrication systems.

5. Check Coupling Alignment

Misalignment between the pump shaft and drive system can increase bearing load and accelerate shaft-seal wear. Verify shaft alignment during installation and prevent external loads beyond the pump’s specified design limits.

6. Verify NBR Compatibility

The referenced KF63RF1 configuration uses NBR seals. Compatibility with the actual fuel, lubricant, additives, temperature and operating environment must be verified before commissioning. Special fluids or high-temperature applications may require a different sealing configuration.