Product Overview
The KP series is a highly representative high-pressure external gear pump product line from KRACHT GmbH, covering five series—KP0, KP1, KP2, KP3, and KP5—with displacements ranging from 1 cm³/rev to 300 cm³/rev. Renowned globally for its high efficiency, low noise, and long service life, this series is widely used in industrial hydraulic systems, construction machinery, and high-pressure fluid transfer applications. The specific model KP1/22A10AKOA4NL1 belongs to the KP1 series with a displacement of 22 cm³/rev.
As a professional hydraulic component manufacturer, we provide 100% interchangeable replacement solutions for the KRACHT KP series. Every KP series gear pump undergoes 100% performance testing under simulated actual operating conditions—from displacement accuracy and pressure stability to volumetric efficiency—fully benchmarked against KRACHT original equipment standards.
The KP1 series pump body is manufactured using high-strength aluminum alloy die-casting (cast iron available upon request), achieving significant weight reduction of approximately 40% compared to traditional cast iron pump bodies while maintaining structural rigidity. The gear unit is manufactured from high-strength case-hardened steel with ground and honed tooth flanks, featuring a 13-tooth specially shaped gear profile that significantly reduces flow pulsation and pressure fluctuation.
Model Code KP1/22A10AKOA4NL1 Breakdown:
KP1: Series code (KP1 series, aluminum housing standard)
22: Nominal displacement 22 cm³/rev
A10: Specification/size code
A: Mounting flange type
KOA: Seal and shaft seal configuration code
4NL1: Special configuration/custom code
Note: The above code interpretation is based on industry naming conventions. Please refer to KRACHT official technical documentation for exact specifications.
Technical Specifications
KP1/22A10AKOA4NL1
Brand: KRACHT
Series: KP1 high-pressure external gear pump
Nominal Displacement: 22 cm³/rev
Rated Operating Pressure: 300 bar
Peak Pressure: 350 bar
Rated Speed: 3,000 min⁻¹
Rated Flow (at 3,000 rpm): 66 L/min
Operating Temperature Range: -20°C to +100°C
Fluid Compatibility: Mineral oil and synthetic hydraulic fluids (viscosity range 10–600 mm²/s)
Recommended Filtration: ISO 4406 19/16 or better
Mounting Type: Flange mounting, conforms to ISO 6162-1
Mounting Orientation: 0°/90°/180°/270° rotatable
Housing Material: High-strength aluminum alloy (die-cast)
Gear Material: Case-hardened steel
Gear Hardness: HRC 58–62
Gear Precision: DIN Grade 5
Seal Material: NBR / FKM optional
Noise Level: ≤ 72 dB(A)
Volumetric Efficiency (at 300 bar): ≥ 92%
KP Series Full Displacement Coverage
KP0 Series: 1 – 8 cm³/rev (KP0/1 to KP0/8)
KP1 Series: 1.5 – 22 cm³/rev (KP1/1.5 to KP1/22)
KP2 Series: 20 – 62 cm³/rev (KP2/20 to KP2/62)
KP3 Series: 58 – 125 cm³/rev (KP3/58 to KP3/125)
KP5 Series: 160 – 300 cm³/rev (KP5/160 to KP5/300)
Important Note: The above specifications are compiled from KRACHT official technical documentation and publicly available industry data. Different suffix codes represent different mounting flanges, seal configurations, and custom options. Please refer to the product nameplate or technical agreement for exact specifications.
Key Technical Advantages
1. Lightweight High-Strength Aluminum Housing — 40% Weight Reduction
The KP1 series pump body is manufactured using high-strength aluminum alloy die-casting, reducing overall weight by approximately 40% compared to traditional cast iron pump bodies while maintaining structural rigidity and impact resistance. This feature not only reduces transportation and installation costs but also significantly decreases overall equipment weight, making it particularly suitable for weight-sensitive mobile machinery and aerospace applications.
2. Case-Hardened Steel Gears with Precision Grinding & Honing — Exceptional Durability
Gear units are manufactured from high-strength case-hardened steel with carburizing and quenching heat treatment, achieving tooth flank hardness of HRC 58–62. Tooth flanks are precision-finished through grinding and honing, achieving gear meshing accuracy to DIN Grade 5. Journal surfaces undergo superfinishing to significantly reduce friction coefficients and wear rates.
3. 13-Tooth Special Profile Design — Ultra-Low Noise and Pulsation
The KP series features a 13-tooth specially shaped gear profile (z = 13). This design dramatically reduces flow pulsation and pressure fluctuation, with measured operating noise ≤ 72 dB(A). Combined with helical gearing and optimized gear geometry, pressure pulsation is further suppressed to ensure smooth system operation.
4. Axial Clearance Compensation Technology — Ultra-High Volumetric Efficiency
The KP series employs axial clearance compensation technology—through precision fit between floating side plates and gear end faces—minimizing internal leakage. At 300 bar operating pressure, volumetric efficiency remains at 92% or higher. Minimal power loss and low fluid temperature rise effectively reduce system energy consumption.
5. Multi-Component Plain Bearings with Dual Sealing System — Long Service Life
Critical friction pairs utilize multi-component alloy plain bearing bushes combined with an NBR/FKM dual sealing system, accommodating a wide temperature range of -20°C to +100°C. The specially designed shaft seal structure maintains zero leakage under 200 bar continuous pressure.
6. Modular Design — Flexible Configuration and System Integration
The KP series follows a modular design philosophy, allowing users to equip DBD series safety valve modules for integrated overload protection as required. Mounting flanges conform to ISO 6162-1 standards with 0°/90°/180°/270° rotatable mounting options to accommodate various spatial layouts. Multiple pump combinations (tandem pumps) are also available for complex system flow and pressure requirements.
Application Areas
Construction Machinery Hydraulic Systems: Main hydraulic pumps for excavators, loaders, concrete pump trucks
Metallurgical Industry: Core power units for continuous casting hydraulic systems, continuous operation in high-temperature environments
Marine Manufacturing: Power sources for steering gear hydraulic systems, DNV-GL certified
Renewable Energy: Hydraulic power units for wind turbine pitch control systems, reliable start-up in extreme cold
Machine Tools & Industrial Equipment: Hydraulic systems, clamping and feed systems
Injection Molding & Die-Casting Machines: Hydraulic power supply for molding equipment
Test Equipment: High-pressure oil sources for aerospace ground test facilities
Chemical & Petrochemical: Transfer of various chemical media
Expert Maintenance Tips
1. Fluid Cleanliness Management
KP series gear pumps are highly sensitive to fluid cleanliness. Maintain fluid cleanliness to ISO 4406 19/16 or NAS 1638 Class 10 or better. Install appropriately rated filters on the pump suction side and regularly inspect filter element condition.
2. First Start-up and Priming
Gear pumps are inherently self-priming, though pre-pressurization may be required for high-viscosity fluids. Ensure the pump cavity is fully primed before first start-up. Never start the pump dry—this will cause severe wear or seizure of gears and bearings.
3. Speed and Pressure Limits
Rated Speed: 3,000 min⁻¹ — do not exceed
Rated Pressure: 300 bar — peak pressure 350 bar is permitted for short-term transient conditions only
Operating Temperature: -20°C to +100°C — special seal configurations required outside this range
4. Seal Selection and Replacement Intervals
NBR shaft seals: Recommended replacement every 6,000 hours
FKM shaft seals: Replacement interval up to 12,000 hours
Select appropriate seal material based on fluid temperature and chemical compatibility
5. Wear Inspection and Service
Gear wear can be assessed by measuring backlash — when backlash exceeds 0.12 mm, service or replacement is recommended. Perform fluid contamination analysis every 2,000 operating hours.
6. Smart Maintenance Option
KRACHT’s SMART MAINTENANCE system enables real-time data collection through integrated temperature sensors and vibration monitoring modules. The system issues warning signals when bearing temperature exceeds 85°C or vibration intensity reaches 2.8 mm/s.
