KP30.34-A8K9-LMD/MB-HSC/PLP20.16-L | Casappa Hydraulic Gear Pump 34.56cc

Product Overview

The KP30.34-A8K9-LMD/MB-HSC/PLP20.16-L is a flagship model of the CASAPPA KP30 series high-pressure hydraulic gear pumps, widely used in concrete pump trucks, construction machinery, and industrial hydraulic systems. Featuring a high-strength cast iron body and compact structural design, the pump delivers excellent volumetric efficiency under high working pressures.

This model is a dual gear pump configuration, integrating a KP30.34 main pump and a PLP20.16 secondary pump into a single unit, providing two independent hydraulic outputs simultaneously—ideal for complex hydraulic systems requiring multiple independent oil sources or combined actions. The “A8K9” designation specifies the shaft and flange configuration, “LMD/MB” identifies port orientation and mounting interface, “HSC” denotes the high-pressure version, and “PLP20.16-L” identifies the secondary pump assembly.

We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. The KP30.34-A8K9-LMD/MB-HSC/PLP20.16-L offers 100% direct interchangeability with original CASAPPA 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 

• Model: KP30.34-A8K9-LMD/MB-HSC/PLP20.16-L

• Brand Series: CASAPPA KP30 Series

• Displacement (Main Pump) : 34.56 cm³/rev

• Displacement (Secondary Pump PLP20.16) : 16 cm³/rev (reference PLP20 series data)

• 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

• Body Material: High-strength cast iron

• Body Design: NSL / NSC

• Seal Material: NBR (Nitrile Butadiene Rubber)

• Pump Type: Dual external gear pump

• Fluid Media: Mineral hydraulic oil

• Flow Output: Approx. 51.8 L/min (1500 rpm × 34.56 cc)

• Weight: Approx. 24 kg

• Compatible Equipment: Sany, Zoomlion, Putzmeister concrete pump trucks, and more

Key Technical Advantages

1. High-Strength Cast Iron Body for Extreme Conditions

The KP30 series features a high-quality cast iron body with rigorous quality control on all critical components, delivering robust structural rigidity capable of withstanding higher pressures and impacts. 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. With a rated pressure of 300 bar and peak pressure of 320 bar, this pump proves its reliability in heavy-duty applications.

2. Integrated Dual Pump Design Simplifies System Layout

The KP30.34-A8K9-LMD/MB-HSC/PLP20.16-L integrates two independent gear pump units into a single assembly, delivering two independent hydraulic outputs simultaneously. This dual design significantly reduces hydraulic circuit complexity and the number of fittings, minimizes leak points, and saves installation space. The main pump KP30.34 provides high flow output while the secondary pump PLP20.16 supplies auxiliary flow—perfectly matching the composite control requirements of concrete pump truck boom movements and pumping systems.

3. High Volumetric Efficiency and High-Temperature Stability

Optimized gear tooth profiles and precision machining processes effectively reduce internal leakage and friction losses, ensuring high volumetric efficiency. Select KP30 series models maintain high efficiency even under elevated temperature conditions. NBR seals enhance oil resistance and wear resistance, ensuring sealing reliability during long-term high-load operation.

4. Long-Life Bearings and Precision-Ground Gears

High-load-capacity bearing systems combined with precision-ground gears ensure long-term stable operation under 300 bar continuous high-pressure conditions. High-strength materials and precision machining guarantee component durability, significantly extending pump service life. The compact component design ensures structural rigidity under high working pressures.

5. Flexible Mounting Configurations

The A8K9 configuration provides specific shaft and flange interfaces that match the original mounting dimensions of mainstream concrete pump trucks including Sany, Zoomlion, and Putzmeister. A wide range of drive shaft, mounting flange, and port options allows this pump to easily adapt to various hydraulic systems and equipment.

Application Areas

• Concrete Pump Trucks (Sany, Zoomlion, Putzmeister, and others)—boom hydraulic systems and pumping systems

• Construction Machinery—hydraulic implements for excavators, loaders, and more

• Metallurgical Equipment—high-pressure heavy-load hydraulic systems

• Mining Machinery—hydraulic power transmission in extreme environments

• Industrial Hydraulic Systems—complex hydraulic control systems requiring dual independent outputs

Expert Maintenance Tips

1. Verify Model Configuration Before Installation

Carefully verify the complete model code on the pump nameplate—KP30.34-A8K9-LMD/MB-HSC/PLP20.16-L—and confirm that all configuration codes (shaft A8K9, ports LMD/MB, pressure version HSC, secondary pump PLP20.16-L) match the original pump exactly. Any configuration discrepancy may result in installation mismatch or substandard performance.

2. 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 (KP30.34) and secondary pump (PLP20.16) port markings to ensure correct hose connections. Incorrect port connections will cause abnormal system pressure or pump damage.

3. Coupling Alignment Precision

Ensure shaft concentricity between the pump and drive shaft is within 0.05 mm during installation. The KP30 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.

4. Suction Line and Filter Configuration

KP30 series gear pumps are sensitive to suction resistance. Recommended suction vacuum does not exceed 0.3 bar (absolute pressure), with suction filter rating no finer than 100μm. For dual pumps, each suction line should have its own independent filter to prevent one line from starving the other.

5. 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 main and secondary pumps.

6. Regular Maintenance and Oil Cleanliness Management

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. Monitor pump body temperature regularly; if it consistently exceeds +80°C, inspect the system cooling and relief valve settings.