KP30.73-05S3-LOH/OG/30.43-LOG/OF S CASAPPA Hydraulic Gear Pump 400bar

Product Overview

The KP30.73-05S3-LOH/OG/30.43-LOG/OF S is a CASAPPA KP30 Series cast iron-bodied fixed displacement external gear pump. 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 KP30 Series features a high-strength cast iron housing with pressure balance plate design, delivering exceptional power density and volumetric efficiency under high-pressure operating conditions. The series offers displacements from 22 to 73cc with working pressures up to 400 bar, making it widely applicable in construction machinery, agricultural equipment, and material handling hydraulic systems.

As an original specification model within the CASAPPA KP30 line, 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 construction machinery hydraulic system maintenance and upgrades.

Technical Specifications

Applicable Model (Primary):

• KP30.73-05S3-LOH/OG/30.43-LOG/OF S

Interchangeable Models:

• KP30.73S0-05S3-LOH/OG-N

• KP30.73S0-05S3-LOH/OG-65M4-N-A

• KP30.43-04S3/30.43-LOG/OF S

• KP30.43-05S3-LGF/GF/30.43-LGF/GF D1

• KP30.38-04S3/30.38 D

• KP30.41-05S6-LMF

• KP30.61-A8K9-L GG/GE-QW-CSC/PLP

Series Technical Specifications (per CASAPPA official documentation):

• Product Series: CASAPPA KP30 Cast Iron Gear Pump

• Pump Type: Fixed Displacement External Gear Pump

• Body Material: High-Strength Cast Iron Housing

• Maximum Pressure Range: Up to 400 bar

• Maximum Displacement Range: Up to 150 cm³/rev

• Mounting Flange: Standard CASAPPA KP30 OEM Interchange Flange

• Port Size: G3/8, G1/2 Hydraulic Ports

• Rotation Direction: Clockwise (D)

• Recommended Hydraulic Oil: ISO VG32 / VG46 Anti-Wear Hydraulic Oil

Rated Pressure by Displacement Model (Series-Wide):

KP30•22 — 280 bar Continuous / 310 bar Peak
KP30•27 — 280 bar Continuous / 310 bar Peak
KP30•31 — 260 bar Continuous / 300 bar Peak
KP30•34 — 260 bar Continuous / 300 bar Peak
KP30•38 — 260 bar Continuous / 300 bar Peak
KP30•41 — 250 bar Continuous / 290 bar Peak
KP30•43 — 250 bar Continuous / 290 bar Peak
KP30•46 — 250 bar Continuous / 290 bar Peak
KP30•51 — 230 bar Continuous / 270 bar Peak
KP30•56 — 215 bar Continuous / 255 bar Peak
KP30•61 — 200 bar Continuous / 240 bar Peak
KP30•73 — 180 bar Continuous / 220 bar Peak

Key Technical Advantages

1. High-Strength Cast Iron Housing for Superior Durability
The KP30 Series features a high-strength cast iron housing design, providing excellent impact resistance and dimensional stability. The cast iron construction delivers outstanding rigidity and vibration resistance, ensuring stable operation under the high-load, high-impact conditions typical of heavy construction machinery.

2. Pressure Balance Plate Design for High Volumetric Efficiency
Pressure balance plates automatically compensate for gear end-face clearances, substantially improving volumetric efficiency and minimizing internal leakage. Stable output flow is maintained even under high-pressure conditions, enhancing overall system energy efficiency.

3. Wide Displacement Range for Flexible System Adaptation
The KP30 Series offers displacements from 22 to 73cc, supporting single, tandem, and multiple pump configurations. The extensive displacement options and port configurations accommodate diverse hydraulic system requirements—from compact loaders to large excavators.

4. Low-Noise Operation with Superior Contamination Resistance
Optimized gear tooth profiles and precision housing machining effectively reduce pressure pulsation and operating noise. The combination of cast iron housing and wear-resistant seal components provides excellent contamination resistance, extending service life in harsh operating environments.

5. Modular Design for Easy Maintenance
The KP30 Series features a modular construction that facilitates flexible configuration and on-site maintenance. Standardized mounting flange and port dimensions ensure complete interchangeability with original products, significantly reducing spare parts inventory costs and downtime.

Application Areas

• Construction Equipment: Excavators (hydraulic cylinder power supply for boom, arm, and bucket movements on small to medium excavators)

• Wheel Loaders: Hydraulic working systems

• Agricultural Machinery: Tractor hydraulic lift systems, balers, sprayers

• Road Rollers: Vibratory roller hydraulic systems

• Forklifts: Forklift hydraulic systems

• Industrial Hydraulic Power Units: Hydraulic power sources for various industrial equipment

Expert Maintenance Tips

1. Installation Precautions

• 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 size to prevent cavitation.

2. Fluid Management

• Use anti-wear hydraulic oils conforming to ISO VG32 / VG46 standards.

• System fluid cleanliness must meet ISO 4406 standards, with a recommended cleanliness level of no less than 19/17/13.

• 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 while monitoring noise, temperature, and system pressure for normal operation.

4. Routine Maintenance

• The KP30 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 500-1,000 operating hours.

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