KP30.43-05S3-LGF/GF/30.43-LGF/GF D1 CASAPPA Hydraulic Gear Pump 44/44cc 300bar

Product Overview

The KP30.43-05S3-LGF/GF/30.43-LGF/GF D1 is a tandem pump configuration within the CASAPPA KAPPA 30 Series two-piece high-strength cast iron-bodied fixed displacement external gear pump family. CASAPPA, as Italy‘s largest manufacturer of high-pressure gear pumps and gear flow dividers, has been a global leader in hydraulic technology since its establishment in 1952.

The KAPPA 30 Series features a two-piece high-strength cast iron housing design, with a rigid and compact structure that enables the integration of multiple functions within a limited space. The series offers displacements from 21.99 to 73.82 cm³/rev, with rated operating pressures up to 300 bar and peak pressures up to 320 bar. This model features an equal-displacement tandem configuration, with both the main and secondary pump sections delivering 43.98 cm³/rev displacement each.

This product enables direct form-fit-function interchangeability with original CASAPPA units—no modifications to piping or mounting interfaces required. Our replacement solution strictly adheres to CASAPPA technical standards and undergoes 100% simulated in-service testing to ensure performance, reliability, and service life identical to OEM products. It is the ideal choice for hydraulic system maintenance and upgrades in excavators, wheel loaders, and other construction machinery.

Technical Specifications

Applicable Model (Primary):

• KP30.43-05S3-LGF/GF/30.43-LGF/GF D1

Model Code Breakdown (per CASAPPA official documentation):

• Product Series: KP30 — CASAPPA KAPPA 30 Cast Iron Gear Pump

• First Section Displacement: 43 — 43.98 cm³/rev

• Second Section Displacement: 43 — 43.98 cm³/rev (equal-displacement tandem configuration)

• Flange/Shaft Configuration: 05S3 — Specific configuration code

• Port Configuration: LGF/GF — Side inlet/outlet ports

• Suffix D1: Rotation direction and specific configuration identifier

Reference Models:

• KP30.43-05S3/30.38/30.34 D

• KP30.43D0-32S3-POG/OF-N

• KP30.43-A8K9-LSD/SC-CSL/30.43-LSC/SB-CSC S

Series Technical Specifications (per CASAPPA official catalog):

• Product Series: CASAPPA KAPPA 30 Cast Iron Gear Pump

• Pump Type: Fixed Displacement External Gear Pump

• Body Material: Two-Piece High-Strength Cast Iron Housing

• Body Design: NSL / NSC

• Mounting Standards: SAE and European Standard Flanges

• Fluid Compatibility: Mineral Hydraulic Oil

• Seals: NBR (Standard)

• Maximum Displacement Range: Up to 150 cm³/rev

This Model Detailed Specifications:

First Section — KP30•43:

• Geometric Displacement: 43.98 cm³/rev

• Rated Operating Pressure (p₂): 300 bar (4,350 psi)

• Peak Pressure (p₃): 320 bar (4,640 psi)

• Maximum Speed: 3,000 min⁻¹

• Minimum Speed: 350 min⁻¹

• Theoretical Flow (@3,000 rpm): Approx. 131.9 L/min

Second Section — KP30•43:

• Geometric Displacement: 43.98 cm³/rev

• Rated Operating Pressure (p₂): 300 bar (4,350 psi)

• Peak Pressure (p₃): 320 bar (4,640 psi)

• Maximum Speed: 3,000 min⁻¹

• Minimum Speed: 350 min⁻¹

• Theoretical Flow (@3,000 rpm): Approx. 131.9 L/min

Tandem Pump Assembly Specifications:

• Displacement per Section: 43.98 cm³/rev

• Total Displacement (Both Sections): 87.96 cm³/rev

• Total Theoretical Flow (@3,000 rpm drive speed): Approx. 263.8 L/min

• Operating Temperature Range: -20°C to +80°C (standard seals)

• Weight: Approx. 15 – 18 kg (tandem configuration, estimated)

Key Technical Advantages

1. Two-Piece High-Strength Cast Iron Housing for Superior Durability
The KAPPA 30 Series features a two-piece high-strength cast iron housing design, providing excellent impact resistance and dimensional stability. The cast iron construction delivers outstanding rigidity and vibration resistance, with the rigid assembly ensuring reliability and high volumetric efficiency even at high operating pressures. The series is suitable for high-temperature and harsh operating environments.

2. Tandem Pump Modular Design — One Shaft, Two Circuits, Simplified System Layout
This model features an equal-displacement tandem pump configuration (KP30.43 / KP30.43), delivering two independent, equal-flow oil sources driven by a single shaft. This design significantly reduces the number of drive interfaces required, simplifies hydraulic piping layout, and is the ideal choice for complex multi-circuit hydraulic systems such as those found in excavators.

3. High Pressure Capacity for Heavy-Duty Applications
The KP30•43 delivers a rated operating pressure of 300 bar and peak pressure of 320 bar. This high-pressure rating is maintained across the 22–46 cm³/rev displacement range of the KAPPA 30 Series, ensuring stable and reliable operation under the high-load conditions typical of heavy construction machinery.

4. Floating Side Plate Pressure Compensation — High Volumetric Efficiency
The “three-piece” construction (two side plates and pump body) features side plates made of special materials that float under pressure, automatically compensating for clearance between gears and side plates. This maintains high volumetric efficiency throughout the pump‘s entire service life while reducing internal leakage.

5. Low-Noise Operation with Wide Speed Range
Optimized gear tooth designs effectively reduce flow pulsation and operational noise. With a minimum speed of just 350 min⁻¹ and a maximum speed of 3,000 min⁻¹, the broad speed range flexibly adapts to diverse application requirements—from low-speed high-torque to high-speed high-flow conditions.

Application Areas

• Excavators: Hydraulic working systems for medium excavators (multi-circuit equal-flow supply for boom, arm, bucket, swing)

• Wheel Loaders: Hydraulic working systems and steering systems

• Construction Equipment: Road rollers, motor graders, and other heavy equipment hydraulic systems

• Material Handling Equipment: Forklift hydraulic systems, aerial work platforms

• Agricultural Machinery: Large tractor hydraulic systems, combine harvesters

• Industrial Hydraulic Systems: Machine tools, presses, injection molding machines

Expert Maintenance Tips

1. Installation Precautions

• The KAPPA 30 Series is a uni-directional rotation pump—verify that the system‘s required rotation direction matches the pump’s identification marking before installation. The suffix D1 indicates right-hand (clockwise) rotation.

• Ensure coaxial alignment between the pump and drive shaft; flexible couplings are recommended to avoid radial loads on the pump shaft.

• The suction line diameter must not be smaller than the pump inlet port; minimum speed should not fall below 350 min⁻¹ to prevent cavitation.

• For this equal-displacement tandem pump configuration, pay special attention to the port connection orientation of both pump sections during installation to ensure correct inlet/outlet port configuration.

2. Fluid Management

• Use anti-wear hydraulic oils conforming to ISO VG 32 / VG 46 standards.

• System fluid cleanliness must meet CASAPPA-recommended standards.

• Operating temperature should be maintained within -20°C to +80°C.

• Prime the pump by filling the housing with hydraulic fluid through the suction port before initial start-up. Never run the pump dry.

3. Start-Up & Commissioning

• Use jog start method for initial start-up; verify correct rotation direction before continuous operation.

• Allow the pump to run under no-load (low pressure) conditions for 2-3 minutes to purge air and ensure proper lubrication.

• Gradually increase to operating pressure (up to 300 bar) while monitoring noise, temperature, and system pressure for normal operation.

4. Routine Maintenance

• The KAPPA 30 gear pump itself is maintenance-free; however, regular maintenance of the entire hydraulic system is essential for trouble-free pump operation.

• Inspect system fluid cleanliness and condition every 1,000-2,000 operating hours.

• Regularly replace return line filters and suction strainers to prevent contaminant ingress into the pump body.