Product Overview
The KP30.51-05S3-LOG/OF/30.51-LOG/OF S 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 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 51.83 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):
Model Code Breakdown (per CASAPPA official documentation):
Product Series: KP30 — CASAPPA KAPPA 30 Cast Iron Gear Pump
First Section Displacement: 51 — 51.83 cm³/rev
Second Section Displacement: 51 — 51.83 cm³/rev (equal-displacement tandem configuration)
Flange/Shaft Configuration: 05S3 — Specific configuration code
Port Configuration: LOG/OF — Side inlet/outlet ports
Suffix S: Standard configuration
Reference Models:
KP30.51-05S3-LOG/OF/30.51-LOG/OF D
KP30.51D0-05S3-LOG/OF-N
KP30.51D0-06S8-LMD/MC-N-CSC
KP30.51/30.34 S
KP30.51-04S3-LGF/GF/30.38-LGF/GF D
Series Technical Specifications (per CASAPPA official catalog K30-01-T-C):
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, DIN, and European Standard Flanges
Fluid Compatibility: Mineral Hydraulic Oil
Seals: NBR
Maximum Displacement Range: Up to 150 cm³/rev
KP30•51 Single Section Performance Parameters (per CASAPPA official technical manual):
Geometric Displacement: 51.83 cm³/rev
Rated Operating Pressure (p₂): 290 bar (4,205 psi)
Peak Pressure (p₃): 310 bar (4,495 psi)
Maximum Speed: 2,500 min⁻¹
Minimum Speed: 350 min⁻¹
Tandem Pump Assembly Specifications:
Displacement per Section: 51.83 cm³/rev
Total Displacement (Both Sections): 103.66 cm³/rev
Rated Operating Pressure: 290 bar
Peak Pressure: 310 bar
Maximum Drive Speed: 2,500 min⁻¹
Total Theoretical Flow (@2,500 rpm): Approx. 259 L/min
Operating Temperature Range: -20°C to +80°C
Rotation Direction: Per specific configuration (R = Right-hand / L = Left-hand)
Key Technical Advantages
1. Two-Piece High-Strength Cast Iron Housing — Superior Durability
The KAPPA 30 Series features a two-piece high-strength cast iron housing design. The rigidity of the components and the compact design not only ensure reliability but also achieve high volumetric efficiency under high operating pressures. The cast iron construction delivers excellent impact resistance and dimensional stability, making it suitable for high-temperature and harsh operating environments.
2. Equal-Displacement Tandem Modular Design — One Shaft, Two Circuits, Simplified System Layout
This model features an equal-displacement tandem pump configuration (KP30.51 / KP30.51), delivering two independent, equal-flow oil sources driven by a single shaft. The series supports combination into tandem, triple, and quadruple pump configurations, significantly reducing the number of drive interfaces required and simplifying hydraulic piping layout.
3. High Pressure Capacity for Heavy-Duty Applications
The KP30•51 delivers a rated operating pressure of 290 bar and peak pressure of 310 bar. With continuous working pressure exceeding 250 bar and even higher peak pressure, the series is capable of handling various heavy-load operating conditions.
4. Three-Piece Floating Side Plate Construction — 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. Optimized Gear Design with Low-Noise Operation
Optimized gear designs, such as “Phasing” noise-reducing gear technology, effectively reduce flow pulsation and operational noise. A wide range of international standard shafts, flanges, and port configurations (including SAE, DIN, and EUROPEAN) are available, allowing easy integration into existing hydraulic systems.
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 tractors (one circuit for steering, the other for implement lifting), balers, sprayers
Industrial Hydraulic Systems: Machine tools, presses, conveyor systems, 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.
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.
NBR seals provide excellent oil and wear resistance, suitable for mineral hydraulic oil media.
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 290 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.
