KP30.43-04S3/30.27 D | Casappa Dual Gear Pump 43.98cc 300bar

Product Overview

The KP30.43-04S3/30.27 D is a flagship dual pump model of the CASAPPA KAPPA 30 series high-pressure cast iron gear pumps, specifically designed for excavator 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 dual gear pump configuration, integrating a KP30•43 main pump with a KP30•27 secondary pump. The dual design supplies two independent hydraulic circuits simultaneously, such as travel and implement systems in excavators, significantly simplifying system layout.

Model code KP30.43-04S3/30.27 D breakdown:

• KP30.43: KAPPA 30 series main pump, 43 size, 43.98 cm³/rev displacement

• 04S3: Shaft and flange configuration code

• 30.27: Secondary pump, 27 size, 26.7 cm³/rev displacement

• D: Rotation direction – Clockwise

The KAPPA 30 series features pump bodies and mounting flanges manufactured from high-strength cast iron with superior mechanical specifications. The series covers displacements from 21.99 to 81.68 cm³/rev, with peak pressures up to 330 bar.

We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. The KP30.43-04S3/30.27 D offers 100% direct interchangeability with original CASAPPA KAPPA 30 series pumps of the same model (Reference Part No. 79919514)—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.

Technical Specifications 

Main Pump (KP30•43) Specifications:

• Model: KP30.43-04S3/30.27 D

• Brand Series: CASAPPA KAPPA 30 Series

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

• Body Material: High-strength cast iron

• Body Design: NSL / NSC

• Main Pump Displacement: 43.98 cm³/rev (2.68 in³/rev)

• Rated Continuous Pressure (p₂): 300 bar (4350 psi)

• Peak Pressure (p₃): 320 bar (4640 psi)

• Maximum Speed: 3000 min⁻¹

• Minimum Speed: 350 min⁻¹

Secondary Pump (KP30•27) Specifications:

• Secondary Pump Displacement: 26.7 cm³/rev (1.63 in³/rev)

• Rated Continuous Pressure (p₂): 300 bar (4350 psi)

• Peak Pressure (p₃): 320 bar (4640 psi)

• Maximum Speed: 3000 min⁻¹

General Specifications:

• Total Displacement (Both Stages): 70.68 cm³/rev

• Fluid Media: Mineral hydraulic oil

• Mounting Type: Flange mount, SAE and European standard compliant

• Rotation Direction: Clockwise (D designation)

• Housing Material: Cast iron

• Reference Part Number: 79919514

• Compatible Equipment: Excavators and other construction machinery

Note: Pressure and displacement data above are based on CASAPPA KAPPA 30 series official technical specifications. Different configuration codes (04S3, 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 Cast Iron Body – Withstands Harsh Excavator Conditions

The KAPPA 30 series features pump bodies and mounting flanges manufactured from high-strength cast iron. 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 rigidity of assembly and compact design ensure high volumetric efficiency and long-term reliability even at high operating pressures.

2. Integrated Dual Pump Design – Simplifies Excavator Hydraulic System Layout

This model integrates a KP30•43 main pump with a KP30•27 secondary pump into a single assembly, supplying pressure oil to two independent hydraulic circuits simultaneously—such as excavator travel motors and implement systems. This dual design significantly reduces hydraulic circuit complexity and the number of fittings, minimizes leak points, and saves valuable installation space.

3. Precision Components with Rigorous Quality Control – Consistency and Long Service Life

Infinite care and attention is taken over the design and construction of each single component, with quality monitored unceasingly. Precision-machined gears and carefully controlled assembly ensure a consistent, perfectly balanced assembly that guarantees unbroken service under the most arduous operating conditions.

4. Low-Noise Design – Improves Operator Environment

The KAPPA 30 series is optimized for critical factors including noise, contamination, and non-flammable fluids. The low-noise characteristic significantly improves the excavator operator’s working environment, reducing fatigue during extended operation.

5. Flexible Mounting Configurations with Broad OEM Interchangeability

KAPPA 30 series offers a wide range of mounting flange, shaft, and port combinations compliant with SAE and European standards. The 04S3 configuration provides specific shaft and flange interfaces, perfectly matching the original mounting dimensions of various excavators. This pump offers direct replacement for original CASAPPA products (Reference Part No. 79919514) with 100% interchangeability.

Application Areas

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

• Mini Excavators—combined-action hydraulic systems for compact excavators

• Wheel Loaders—bucket lift and steering hydraulic systems

• Material Handling Equipment—forklifts, reach stackers hydraulic systems

• Agricultural Machinery—tractors and other agricultural equipment hydraulic systems

• Industrial Hydraulic Systems—various industrial equipment requiring dual independent outputs

Expert Maintenance Tips

Model Code Verification (verify each element):

Before installation, carefully verify the complete model code on the pump nameplate—KP30.43-04S3/30.27 D—and confirm the following:

• KP30.43: KAPPA 30 series main pump, 43.98 cm³/rev displacement.

• 04S3: Shaft and flange configuration code – verify shaft type (SAE splined, keyed, or tapered) matches the original.

• 30.27: Secondary pump, 26.7 cm³/rev displacement.

• 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 Dual Pump Inlet and Outlet Ports:

The dual pump features two independent inlet and outlet port sets. During installation, carefully distinguish between the main pump (KP30.43) and secondary pump (30.27) port markings to ensure correct hose connections. Incorrect port connections will cause abnormal system pressure or pump damage.

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 Filter Configuration:

Ensure the suction line is properly sealed with no air leaks and the suction filter is not clogged. For dual pumps, each suction line should have its own independent filter to prevent one line from starving the other. Recommended suction vacuum does not exceed 0.3 bar (absolute pressure).

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 dual 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 cleanliness not lower than ISO 4406 18/16/13 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.