KP30.51-32S3-LGF/GF/30.51-LGF/GF D | Casappa Twin Pump 51.83+51.83cc

Product Overview

The KP30.51-32S3-LGF/GF/30.51-LGF/GF D is a flagship twin pump model of the CASAPPA KAPPA 30 series high-pressure cast iron gear pumps, specifically designed for excavator and wheel loader combined-action hydraulic systems. Founded in 1952, CASAPPA is a globally recognized manufacturer of hydraulic pumps and motors, with products widely applied in construction machinery, material handling, agricultural machinery, and industrial applications.

This model features a twin gear pump configuration, with both the front and rear pumps being KP30•51规格, delivering identical displacements of 51.83 cm³/rev each. The KAPPA 30 series features two-piece cast iron construction with both the pump body and mounting flange manufactured from high-strength cast iron for robust structural rigidity. The twin design supplies two independent hydraulic circuits simultaneously—such as excavator travel motors and implement systems—significantly simplifying system layout.

Model code KP30.51-32S3-LGF/GF/30.51-LGF/GF D breakdown:

• KP30.51: KAPPA 30 series front pump, 51 size, 51.83 cm³/rev displacement

• 32S3: Shaft and flange configuration code (SAE standard flange)

• LGF/GF: Front pump port orientation and mounting interface specification

• 30.51: Rear pump, 51 size, 51.83 cm³/rev displacement

• LGF/GF: Rear pump port orientation and mounting interface specification

• D: Rotation direction – Clockwise

This pump carries the reference part number 79919700.

We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. The KP30.51-32S3-LGF/GF/30.51-LGF/GF D offers 100% direct interchangeability with original CASAPPA KAPPA 30 series pumps of the same model—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.

Technical Specifications

KAPPA 30 Series General Specifications:

• Brand Series: CASAPPA KAPPA 30 Series

• Pump Type: Cast iron external gear pump (twin configuration)

• Body Material: High-strength cast iron (two-piece construction)

• Body Design: NSL / NSC

• Fluid Media: Mineral-based hydraulic oil

• Fluid Temperature Range: -15°C to +80°C

• Recommended Viscosity: 20 – 100 mm²/s

• Recommended Filtration: 10 – 25 microns

Front Pump (KP30•51) Specifications:

• Model: KP30.51-32S3-LGF/GF/30.51-LGF/GF D

• Front Pump Displacement: 51.83 cm³/rev (3.16 in³/rev)

• Maximum Rated Continuous Pressure: 230 bar

• Series Maximum System Pressure (Relief Valve Setting): 300 bar

• Series Maximum Peak Pressure: 320 bar (4640 psi)

• Theoretical Flow (@ 1500 rpm): 77.7 L/min

• Maximum Speed: 2500 min⁻¹

• Minimum Speed: 350 min⁻¹

Rear Pump (KP30•51) Specifications:

• Rear Pump Displacement: 51.83 cm³/rev (3.16 in³/rev)

• Maximum Rated Continuous Pressure: 230 bar

• Maximum Speed: 2500 min⁻¹

• Minimum Speed: 350 min⁻¹

General Specifications:

• Total Displacement (Both Stages): 103.66 cm³/rev

• Rotation Direction: Clockwise (D designation)

• Mounting Flange: European standard flange, 50.80 mm centering diameter

• Drive Shaft: Tapered 1:8 (European standard)

• Inlet Port: Ø 51mm, 4-hole, M10

• Outlet Port: Ø 40mm, 4-hole, M8

• Housing Material: Cast iron

• Seal Material: Perbunan (NBR)

• Weight: Approx. 13.54 kg

Note: Pressure and displacement data above are based on CASAPPA KAPPA 30 series official technical specifications. Different configuration codes (32S3, LGF/GF, etc.) correspond to different shaft types, flange specifications, and port configurations. Refer to the pump nameplate for exact specifications.

Key Technical Advantages

1. High-Strength Two-Piece Cast Iron Construction – Withstands Harsh Construction Equipment Conditions

The KAPPA 30 series features pump bodies and mounting flanges manufactured from high-strength cast iron with two-piece construction. Compared to aluminum alloy bodies, cast iron provides superior structural stability and deformation resistance under extreme conditions of high temperature, high pressure, and high impact. The compact design allows multiple functions to be integrated within limited space.

2. Integrated Twin Pump Design with Symmetrical Displacement – Simplifies Hydraulic System Layout

This model integrates two KP30•51 pump sections into a single assembly, with both stages delivering identical displacements (51.83 cm³/rev each), supplying two independent hydraulic circuits with symmetrical flow rates—such as excavator travel motors and implement systems. This twin design significantly reduces hydraulic circuit complexity and the number of fittings, minimizes leak points, and saves valuable installation space.

3. Wide Displacement Range with High Pressure Capability

The KAPPA 30 series covers displacements from 4.95 to 150.79 cm³/rev, with both KP30•51 stages delivering 51.83 cm³/rev each. Maximum system pressure reaches 300 bar, with peak pressure capability of 320 bar. This twin-pump combination provides powerful and stable hydraulic output for heavy-duty excavator and loader operations.

4. Low-Noise Operation with Long Service Life

The KAPPA series is renowned for high operating pressure, low noise, and long service life. Optimized gear tooth profiles and precision machining ensure low-noise, low-pulsation operation even at high pressures. High-strength cast iron construction and precision-machined gears guarantee component durability, significantly extending pump service life.

5. Flexible Mounting Configurations with OEM Interchangeability

KAPPA 30 series offers a wide range of mounting flange, shaft, and port combinations compliant with European and SAE standards. The 32S3 configuration provides a tapered 1:8 shaft with European standard flange, and the LGF/GF configuration provides flange ports, perfectly matching the original mounting dimensions of various excavators and wheel loaders. This pump carries reference part number 79919700, offering direct replacement for original CASAPPA products with 100% interchangeability.

Application Areas

• Excavators—travel hydraulic systems and implement hydraulic systems (boom, arm, bucket)

• Wheel Loaders—bucket lift and steering hydraulic systems

• Bulldozers—dozing hydraulic systems

• Telehandlers—hydraulic systems

• Material Handling Equipment—reach stackers, heavy forklifts hydraulic systems

Expert Maintenance Tips

Model Code Verification (verify each element):

Before installation, carefully verify the complete model code on the pump nameplate—KP30.51-32S3-LGF/GF/30.51-LGF/GF D—and confirm the following:

• KP30.51: KAPPA 30 series front pump, 51.83 cm³/rev displacement.

• 32S3: Shaft and flange configuration code – SAE standard flange configuration.

• LGF/GF: Front pump port configuration – verify port specifications match piping.

• 30.51: Rear pump, 51.83 cm³/rev displacement.

• LGF/GF: Rear pump port configuration.

• D: Rotation direction – Clockwise.

Verify Rotation Direction:

“D” indicates clockwise rotation (viewed from shaft end). Confirm that the drive shaft rotation matches the direction code in the model. KAPPA 30 series offers both clockwise (D) and counter-clockwise (S) rotation options. Incorrect rotation will prevent pressure build-up and may damage internal gears and bearings.

Identify Twin Pump Inlet and Outlet Ports:

The twin pump features two independent inlet and outlet port sets. During installation, carefully distinguish between the front pump and rear pump port markings (both LGF/GF configuration) to ensure correct hose connections. Incorrect port connections will cause abnormal system pressure or pump damage. Inlet port is Ø 51mm, 4-hole, M10; outlet port is Ø 40mm, 4-hole, M8.

Mounting Flange and Drive Shaft Matching:

Verify that the equipment-side flange type and shaft specification match the pump configuration before installation. This model features a tapered 1:8 shaft with European standard. The mounting flange is European standard with 50.80 mm centering diameter.

Coupling Alignment Precision:

Ensure shaft concentricity between the pump and drive shaft is within 0.05 mm during installation. The KAPPA 30 series cast iron body has high rigidity and is particularly sensitive to alignment accuracy. Excessive misalignment will cause premature bearing wear, seal leakage, or even shaft fracture. Use flexible couplings and dial gauges for precise alignment.

Suction Line and Fluid Requirements:

Ensure the suction line is properly sealed with no air leaks and the suction filter is not clogged. Recommended filtration is 10 – 25 microns. Fluid temperature should be maintained within -15°C to +80°C, with recommended viscosity of 20 – 100 mm²/s. For twin pumps, each suction line should have its own independent filter to prevent one line from starving the other.

First-Start Priming Procedure:

After new pump installation or system overhaul, perform priming before first start. Jog the pump at low speed and low pressure until the pump body is fully filled with oil and air is purged, then gradually increase to rated speed and working pressure. Both cavities of the twin pump must be primed separately to ensure adequate lubrication for both stages. Running the pump dry will cause irreversible damage to gears and bearings.

Oil Cleanliness and Regular Maintenance:

Replace hydraulic oil and return filters every 1,000 operating hours or per equipment manufacturer recommendations. Using hydraulic oil with proper cleanliness will significantly extend pump service life. Regularly monitor pump body temperature—if it consistently exceeds +80°C, inspect the system cooling and relief valve settings.