KP0588CPSS KYB Hydraulic Gear Pump | 58.8cc 280 bar for KP05 Series

Product Overview

The KP0588CPSS, KP0530, KP0535, KP0540, KP0553, KP0560, and KP0570 are representative models of the KYB (Kayaba) KP05 series high-performance compact external hydraulic gear pumps. The KP05 series is a key product line in KYB’s hydraulic gear pump portfolio, offering displacements ranging from 2.3 cc/rev to 13.2 cc/rev across 10 variants.

Featuring a high-strength aluminum alloy die-cast body and precision-ground gears, the series delivers an optimal balance of lightweight construction and pressure durability. Advanced pressure-loading technology and floating side plates minimize internal leakage across a wide temperature range, maintaining superior volumetric efficiency. The KP05 series is renowned for its ultra-compact design, high-pressure durability, low-noise operation, and proven reliability—extensively used as OEM components for leading brands including Komatsu and Toyota.

Engineered as a direct OEM-replacement solution, these models fully comply with KYB original design standards and mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.

Model Code Breakdown (Bulleted List) :

• KP — Series: KYB External Gear Pump

• 05 — Platform: KP05 Compact Series

• 30 / 35 / 40 / 53 / 60 / 70 / 88 — Displacement code: 30 = 3.0 cc/rev, 88 = 8.8 cc/rev

• CPSS — Configuration code: C = Clockwise rotation, P = Parallel key shaft, SS = Standard seals (varies by model suffix)

Note: KP0588CPSS is the largest displacement model in this series, featuring 58.8 cc/rev (legacy designation, equivalent to 8.8 cc/rev with a 10× multiplier in the model code).

Technical Specifications (Bulleted List)

KP05 Series General Specifications

• Series: KYB KP05 External Gear Pump

• Displacement Range: 3.0 – 13.2 cc/rev (10 variants)

• Maximum Operating Pressure: 20.6 MPa (approx. 206 bar)

• Speed Range: 600 – 3000 rpm

• Maximum Flow: 39 L/min

• Weight Range: 1.6 – 1.7 kg

• Housing Material: High-strength aluminum alloy

• Rotation Direction: Clockwise (standard) / Counter-clockwise (optional)

• Shaft Type: Spline (S) / Parallel Key (P)

KP0588CPSS Specific Specifications

• Model: KP0588CPSS

• Displacement: 58.8 cc/rev (approx. 8.8 cc/rev equivalent)

• Rated Pressure (Continuous): 280 bar

• Peak Pressure (Maximum): 350 bar

• Maximum Speed: 3000 rpm

• Minimum Speed: 600 rpm

• Flow @ 1500 rpm: 88.2 L/min

• Rotation Direction: Clockwise (viewed from shaft end)

• Shaft Type: Keyed shaft

• Control Type: Pressure Compensator

• Inlet Port: SAE 3/4″

• Outlet Port: SAE 1/2″

• Case Drain Port: SAE 1/4″

• Weight: Approx. 10.5 kg

• Dimensions: 13 cm × 13 cm × 23 cm

• Housing Material: Aluminum alloy

KP0530 / KP0535 / KP0540 Specific Specifications

• Model: KP0530 / KP0535 / KP0540

• Displacement: 3.0 / 3.5 / 4.0 cc/rev

• Maximum Operating Pressure: 20.6 MPa (approx. 206 bar)

• Minimum Speed: 600 rpm

• Maximum Speed: 3000 rpm

• Weight: Approx. 1.6 kg

KP0553 / KP0560 / KP0570 Specific Specifications

• Model: KP0553 / KP0560 / KP0570

• Displacement: 5.3 / 6.0 / 7.0 cc/rev

• Maximum Operating Pressure: 20.6 MPa (approx. 206 bar)

• Minimum Speed: 600 rpm

• Maximum Speed: 3000 rpm

• Weight: Approx. 1.7 kg

Key Technical Advantages

1. Ultra-Compact & Lightweight Design
The KP05 series features a high-strength aluminum alloy die-cast body that significantly reduces overall weight (just 1.6–1.7 kg) while maintaining structural integrity. The compact footprint makes it ideal for installation in tight compartments of modern machinery.

2. High-Pressure Durability
Despite its compact size, the KP05 series is designed for continuous high-pressure operation with exceptional resistance to pressure spikes. The KP0588CPSS delivers 280 bar rated pressure and 350 bar peak pressure; other models deliver 206 bar maximum operating pressure, ensuring a long and stable service life.

3. High Volumetric Efficiency
Advanced pressure-loading technology and floating side plates minimize internal leakage across a wide temperature range. Optimized gear tooth profiles and precision machining reduce fluid pulsation and mechanical vibration, maintaining superior efficiency throughout the operating range.

4. Low Noise Signature
Optimized gear tooth profiles and precision machining reduce fluid pulsation and mechanical vibration. The low-noise operation contributes to a quieter working environment for both the machine and the operator—particularly valuable in mobile and agricultural applications with strict noise requirements.

5. Full Series Coverage for Flexible Selection
The KP05 series offers displacements from 2.3 to 13.2 cc/rev across 10 variants. KP0530, KP0535, KP0540, KP0553, KP0560, and KP0570 cover the 3.0–7.0 cc/rev range; KP0588CPSS provides 58.8 cc/rev (8.8 cc/rev equivalent) for higher flow requirements. Both clockwise and counter-clockwise rotations, as well as spline and parallel key shaft options, are available.

6. OEM-Proven Reliability
The KP05 series is extensively used as an OEM component for leading brands including Komatsu and Toyota, proving its dependability in the most demanding work cycles.

7. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with KYB original design standards, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.

Application Areas

The KP05 series gear pumps are widely used in the following equipment:

• Construction Equipment: Compact loaders, mini excavators, and light construction machinery

• Agricultural Machinery: Tractors, harvesters, sprayers, and agricultural equipment

• Material Handling Equipment: Small forklifts, lifting platforms, and handling systems

• Industrial Machinery: Industrial hydraulic systems and hydraulic power units (HPU)

• Mobile Equipment: Utility vehicles, small hydraulic systems

• Metallurgy Industry: Hydraulic systems for metallurgical equipment

Expert Maintenance Tips

1. Model Confirmation
The KP05 series includes multiple displacement variants (KP0530 = 3.0 cc/rev, KP0535 = 3.5 cc/rev, KP0540 = 4.0 cc/rev, KP0553 = 5.3 cc/rev, KP0560 = 6.0 cc/rev, KP0570 = 7.0 cc/rev, KP0588CPSS = 58.8 cc/rev / 8.8 cc/rev equivalent). Before installation, confirm the correct displacement based on system flow requirements.

2. Rotation Direction Confirmation

• KP0588CPSS features clockwise rotation (viewed from shaft end)

• Other KP05 series models support both clockwise (C) and counter-clockwise (A) configurations

Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to gears and bearings within a short period.

3. Installation Precautions

• Thoroughly clean the mounting flange and shaft mating surfaces before installation to ensure no debris remains

• Use KYB-specified torque values for mounting bolts—avoid over-tightening which may cause distortion of the aluminum housing

• Ensure correct connection of inlet port (SAE 3/4″) and outlet port (SAE 1/2″)

• The lightweight aluminum housing is susceptible to impact damage—handle with care during installation

4. First Start-Up and Bleeding

• Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry

• After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system

• Check for abnormal noise or leakage—aluminum housing pumps are particularly sensitive to cavitation

5. Fluid and Filtration

• Use high-quality anti-wear hydraulic oil compliant with ISO VG 32–68 grades

• Maintain system oil cleanliness with filtration ≤ 25 μm recommended

• Maintain operating temperature within recommended range

• Regularly replace return line filters to prevent contaminants from entering the pump

6. Periodic Maintenance

• Check mounting bolt torque every 1,000 operating hours

• Regularly monitor system operating pressure—KP0588CPSS not to exceed 280 bar rated pressure (350 bar peak); other models not to exceed 206 bar

• If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly

• Regularly inspect shaft seals to prevent leakage