KP1/8G10AKOA4NL1 KRACHT Gear Pump 8cc 250 bar 3000 rpm

Product Overview

The KP1/8G10AKOA4NL1 is a high-performance external gear pump from Germany’s KRACHT KP1 Series. KRACHT is a family-owned enterprise founded in 1911, headquartered in Werdohl, Germany, and a world-renowned specialist in fluid control. The KP Series high-pressure gear pumps are primarily used in oil-hydraulic systems and represent the core of KRACHT’s high-pressure gear pump product line.

This unit belongs to the KP1 Sub-Series with a displacement of 8 cm³/rev. The KP Series features hydraulic axial clearance compensation with the ability to withstand high dynamic loads and insensitivity to pressure peaks and continuous vibrations. The KP1/8G10AKOA4NL1 is a sealed bearing pump, with all necessary components housed in a high-strength die-cast aluminum or cast iron housing closed by mounting flange covers and end covers. Drive and driven gears are manufactured from case-hardened steel, with gear flanks precision ground and honed to ensure the highest manufacturing quality.

Key Interchangeability Advantage: Our KP series gear pumps are manufactured to strict German KRACHT original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces, flange dimensions, shaft configurations, and port positions are identical to the original product – no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.

Model Code Breakdown (based on KRACHT KP Series designation rules):

• KP = Series: High Pressure Gear Pump

• 1 = Sub-series: KP1 (displacement 1.5–22 cm³/rev)

• 8 = Displacement: 8 cm³/rev

• G10A = Shaft type and flange configuration code

• K0A = Seal and design configuration code

• 4NL1 = Specific design code

Technical Specifications 

KP1/8G10AKOA4NL1

• Product Series: KRACHT KP1 Series High-Pressure External Gear Pump

• Brand: KRACHT (Germany)

• Pump Type: External gear pump (sealed bearing pump) with hydraulic axial clearance compensation

• Displacement: 8.0 cm³/rev

• Maximum Continuous Operating Pressure: 250 bar

• Peak Pressure: Up to 300 bar

• Maximum Speed: 3000 – 4000 rpm

• Minimum Speed: 500 rpm

• Flow Rate Range (KP1 Series): 2.4 – 31.6 L/min

• Media Temperature Range: -20°C to +90°C (NBR seals) / +100°C (FKM seals)

• Ambient Temperature Range: -20°C to +60°C

• Media Viscosity Range: 10 – 1500 mm²/s

• Inlet Pressure: -0.4 to 2 bar

• Housing Material: High-strength die-cast aluminum or grey cast iron

• Gear Material: Case-hardened steel, ground and honed flanks

• Bearing Type: Heavy-duty multi-alloy plain bearings (sealed bearings)

• Seals: NBR or FKM

• Mounting Flange: SAE-A standard

• Drive Shaft: Parallel keyed shaft

• Direction of Rotation: Clockwise(viewed from shaft end)

• Mounting Position: Any

• Recommended Fluids: Hydraulic oils, mineral oil-based media (DIN 51524/25), heavy oils, diesel fuels, etc.

Key Technical Advantages

1. Hydraulic Axial Clearance Compensation for High Efficiency Under Pressure

The KP Series features hydraulic axial clearance compensation, with pressure field sealing elements automatically compensating for axial clearance. Sealed bearings on both sides support the gear shafts, with pressure feedback from the bearing seal area to the heavy-duty multi-alloy plain bearing bushings compensating for axial clearance. This design effectively minimizes internal leakage, ensuring high volumetric efficiency under high-load and high-pressure conditions. The pump withstands high dynamic loads, remaining insensitive to pressure peaks and continuous vibrations.

2. Sealed Bearing Pump Construction for Long Service Life

The KP1/8G10AKOA4NL1 is a sealed bearing pump, with all necessary components housed in a high-strength housing closed by mounting flange covers and end covers. Large-module gears with specially engineered tooth profiles effectively reduce volumetric error and inevitable pressure pulsation, eliminating the significant noise caused by oil trapping. The pump offers a service life 5-10 times longer than conventional gear pumps.

3. High-Strength Materials and Precision Manufacturing

Drive and driven gears are manufactured from case-hardened steel with surface hardening. Gear flanks are ground and honed to ensure high precision, with gear journals superfinished to achieve high accuracy and increased strength. All necessary components are manufactured from high-wear-resistant materials.

4. Low Pulsation and Low Noise for Smooth Operation

Large-module gears with specially engineered tooth profiles effectively reduce volumetric error and pressure pulsation, eliminating significant noise caused by oil trapping. Pressure pulsation at the pump outlet can be controlled within 1%. This characteristic significantly reduces pump operating noise, providing smoother operation for downstream hydraulic components.

5. Modular Design for Flexible Configuration

The KP Series features a modular standard design with multiple configuration options. Optional integral safety valves can be mounted directly on the pump, or combined with other valves in valve blocks replacing the pump cover. Optional ATEX explosion-proof versions are available for special applications. The KP1 Series offers displacements from 1.5 to 22 cm³/rev (including 2/3/4/5.5/6.3/8/11/14/16/19/22 cm³/rev), enabling precise matching to diverse application requirements.

Application Areas

• Forced Lubrication Systems: Lubrication supply for long-term continuous operation equipment

• Fuel Injection Systems: Fuel injection applications in petroleum, chemical, power generation, and asphalt mixing plants

• Construction Machinery: Construction and agricultural machinery hydraulic systems

• Mining and Metallurgy: Mining equipment and steel industry hydraulic systems

• Chemical and Petrochemical Industry: Chemical media transfer, metering technology

• Marine Industry: Marine and offshore technology hydraulic systems

• Wind Power: Wind energy equipment lubrication systems

• Machine Tools and Industrial Equipment: Machine tool hydraulic systems, drive technology

Expert Maintenance Tips

1. Model Confirmation and Selection

• The KP1/8G10AKOA4NL1 has a displacement of 8 cm³/rev, belonging to the KP1 sub-series (displacement 1.5–22 cm³/rev).

• This model features SAE-A mounting flange, parallel keyed shaft, and clockwise rotation. For different configurations (counter-clockwise, splined shaft, etc.), select the corresponding suffix model.

• Verify system operating pressure, flow requirements, and rotation direction during selection.

2. Pre-Installation Checks

• KP Series pumps have a fixed rotation direction (this model: clockwise) – verify matches system drive direction before installation. When viewed from the shaft end, clockwise rotation means oil flow is from left to right.

• Confirm mounting flange type (SAE-A) and drive shaft specification (parallel keyed) precisely match system interface.

• Never use hammer-driven installation – always use proper tools.

• Axial loads are not permitted; radial loads are limited by magnitude and direction. An outboard bearing must be installed to absorb external loads.

3. First Start-Up & Media Priming

• Prime the pump housing with clean media before first start-up; ensure suction line is fully filled – never run dry.

• Maintain media temperature within -20°C to +90°C (NBR seals) or +100°C (FKM seals).

• Maintain ambient temperature within -20°C to +60°C.

• Speed range: 500 – 3000 rpm.

4. Filtration Requirements

• Ensure media contains no solid particles to prevent gear and bearing wear.

• Regularly monitor fluid cleanliness to prevent contaminants from accelerating gear and bearing wear.

5. Operating Monitoring

• Continuous operating pressure must not exceed 250 bar; peak pressure must not exceed 300 bar.

• If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.

• Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.

• For models with integral safety valves, do not operate continuously in relief mode.