Kracht KP 2/40 F1BA Z00 2DL1 Hydraulic Gear Pump

Kracht KP 2/40 F1BA Z00 2DL1 Hydraulic External Gear Pump

The Kracht KP 2/40 F1BA Z00 2DL1 is an external gear pump engineered by KRACHT GmbH (Werdohl, Germany) for demanding marine and industrial fluid power applications. Featuring a nominal displacement of approximately 40.2 cm³/rev (2.45 in³/rev), the KP 2 Series is built around a heavy-duty gray cast iron housing (EN-GJL-250) paired with case-hardened, micro-finish ground steel gears (z = 14 tooth profile optimized for pulsation damping).

From a marine engineer’s perspective, the KP 2 series excels in continuous duty aboard commercial vessels and offshore rigs. It incorporates pressure-compensated axial sliding plates that adjust dynamic running clearances relative to instantaneous operating pressure. This active axial-play compensation prevents internal slip under heavy pressure spikes (up to 250–300 bar depending on viscosity and duty cycle), maintaining volumetric efficiency exceeding 90% across variable marine lube oil and hydraulic fluid temperatures.

Model Details:

• Manufacturer: KRACHT GmbH (Germany)
• Model Series: KP 2
• Full MPN: KP 2/40 F1BA Z00 2DL1
• Alternative Manufacturer References: KP2/40-F1BA-Z00-2DL1, KP2/40F1BAZ002DL1

Main Features

1. Low-Pulsation 14-Tooth Gear Train: Optimized flank geometry with 14 micro-finished, case-hardened teeth dramatically dampens fluid shear noise, cavitation erosion, and hydraulic pressure waves within closed shipboard circuits.
2. Hydraulic Axial Clearance Compensation: Features floating brass/bronze alloy sliding plates loaded by calibrated hydraulic pressure fields, eliminating volumetric slip across the complete viscosity range (10 to 600 mm²/s).
3. Robust Multi-Layer Plain Bearings: PTFE-lead (PTFE-Pb) impregnated bronze composite bushes pressed onto heavy steel backs provide superior hydrodynamic oil-wedge formation, exceptional emergency run properties, and high radial load absorption.
4. Precision SAE Flange Connections: Heavy-duty flanged port interfaces safeguard against high-pressure leaks and vibration-induced thread stripping typical of threaded NPT/BSPP ports in continuous heavy-machinery operation.

Compatible Power Units & Machinery

• Marine Power Units: Hatlapa, MacGregor, Rolls-Royce / Kongsberg Marine deck machinery power units, Kawasaki hydraulic steering gears, and Brattvaag hydraulic systems.
• Prime Movers: Standard IEC frame electric motors (B3/B5 flanged motors, 11 kW to 22 kW depending on pressure setpoint, typically frame sizes 160M/L or 180M via bellhousing & flexible spider coupling).
• Fluid Media: Mineral hydraulic oils (HL, HLP according to DIN 51524), transmission fluids, engine oils (SAE 10W to 40), and synthetic biodegradable esters (HEES, max 70°C).

Cross-Reference Interchange

• KRACHT Reference: KP 2/40 F1BA Z00 2DL1 / KP2-40-F1BA-Z00-2DL1
• Direct Function Alternates: Rexroth AZPF / AZPN high-pressure gear pump units (matching displacement & shaft profile via transition bracket), Marzocchi GHP2 / ALP2 series, Parker Commercial Intertech P20 / P31 series.

Frequently Asked Questions

Can the Kracht KP 2/40 pump operate in bi-directional rotation?

No. The Kracht KP 2/40 F1BA Z00 2DL1 is manufactured strictly for single-direction clockwise (D) rotation. The internal axial-compensation pressure plates feature specialized asymmetrical kidney grooves designed to channel pressurized fluid beneath the seal lands. Running the pump counter-clockwise will pressurize the low-pressure shaft lip seal, resulting in seal blow-out and oil loss.

What is the maximum recommended viscosity for this pump during cold startups?

The normal operating kinematic viscosity range is 10 to 600 mm²/s (cSt). During cold dockside startups in sub-zero climates, fluid viscosity may peak up to 1,000 mm²/s, provided the pump is run without pressure load at low RPM until the reservoir heating coils bring the oil up to normal operational viscosity (30 to 45 mm²/s).

What happens if the pump experiences axial thrust on the drive shaft?

Axial forces directed into or pulling out of the shaft are impermissible on this model variant. Axial loading causes direct mechanical contact between the gear journal shoulders and the multi-layer plain bearings, quickly resulting in localized overheating, scoring, and seized components. Use an outboard bearing adapter if external loads are present.

How do I identify if the internal sliding plates need replacement?

Volumetric slip is the main symptom of sliding plate or gear face wear. If the pump fails to develop design pressure (falling below desired bar settings at standard operating temperature) or delivery rate drops while the electric motor draws nominal current without line obstruction, internal bypass across the pressure-compensating plates has occurred due to fluid contamination or thermal degradation.