KYB KP0 Series Gear Pump | KP0530 KP0560 KP0588 Hydraulic Pump

The KYB KP0 Series (commonly known as the KP05 series) high-pressure hydraulic gear pumps by Chengyuan Hydraulic are precision-engineered fluid power units fully compatible with KYB (Kayaba) industrial standards. These compact pumps are widely utilized in forklift steering, mini-excavator pilot circuits, and various micro-hydraulic power packs. For core models like KP0530, KP0560, and KP0588, we utilize high-precision extruded aluminum housings and a robust three-piece construction. Every KP0 series pump undergoes 100% simulated operational load testing for volumetric and mechanical efficiency before shipment, ensuring minimal internal leakage even under high pressure and delivering guaranteed 100% original-place interchangeability.

Technical Specifications :

• Product Series: KYB KP0 / KP05 High-Pressure Gear Pump

• Supported Models: KP0530 / KP0535 / KP0540 / KP0553 / KP0560 / KP0570 / KP0588

• Displacement Range: 3.0 $cm^3/rev$ to 8.8 $cm^3/rev$

• Rated Operating Pressure: 21 MPa (210 bar)

• Peak Pressure Limit: 25 MPa (250 bar)

• Maximum Rated Speed: Up to 4000 rpm (size dependent)

• Minimum Stable Speed: 500 rpm

• Volumetric Efficiency: $\ge 92\%$ (at rated pressure and speed)

• Body Material: High-Strength Extruded Aluminum Alloy

• Sealing Compounds: Standard Wear-Resistant NBR / Optional Viton (FKM)

Key Technical Advantages:

• Axial Pressure-Balanced Thrust Plates: Utilizing a floating axial compensation mechanism. As system pressure rises, the thrust plates automatically optimize the clearance between the plate and the gear face. This significantly slashes internal bypass while maximizing mechanical efficiency during startups.

• High-Precision DU Composite Bushings: Equipped with high-load capacity, self-lubricating composite bearings. Under continuous 21 MPa loads, these bushings provide superior radial support, minimizing eccentric wear of the gear set and extending service life under frequent start-stop duty cycles.

• Low Pulsation & Silent Architecture: The gear profiles are secondary-lapped to achieve a high contact ratio. This precision engineering suppresses pressure ripples caused by fluid trapping, resulting in operational noise levels 5-8 dB(A) lower than standard market equivalents.

• Three-Piece Modular Housing Design: The front cover, center body, and end cover are secured with high-tensile through-bolts. This rigid architecture resists deformation even under 25 MPa peak impulses, ensuring long-term structural integrity and performance stability.

Application Areas:

• Material Handling: Hydraulic steering systems and auxiliary circuits for 1-2 ton electric or IC forklifts.

• Micro Construction Machinery: Pilot control loops or fan cooling drives for 0.8-2 ton micro-excavators.

• Hydraulic Lifts: Power units for small scissor lifts and vehicle tail lifts.

Expert Maintenance Tips:

• Mandatory Priming Procedure: Upon initial installation, pre-fill the pump with clean hydraulic oil via the inlet port and rotate it manually at low speed for 1-2 minutes. Never start dry, as this will instantly score the thrust plates and cause permanent volumetric loss.

• Inlet Filtration Standards: Due to the micro-clearances within the KP0 series, it is recommended to install a suction filter with a rating of at least $80 \mu m$ and ensure suction vacuum stays within -0.03 MPa to avoid cavitation.

• Oil Temperature Management: Maintain hydraulic fluid temperatures between $30^\circ C$ and $60^\circ C$. Exceeding $80^\circ C$ will exponentially shorten the lifespan of seals and bushings.