3520VQ45A9 3520VQ45A10 3520VQ45A11 Eaton Vickers VQ Double Vane Pump

Product Overview:

The 2520VQ, 3520VQ, 4520VQ, 4525VQ and 4535VQ series (including configurations such as 3520VQ45A9, 3520VQ45A10 and 3520VQ45A11) are Eaton Vickers VQ high-performance tandem fixed-displacement vane pumps engineered for high-speed, high-pressure mobile hydraulic applications. Featuring the 10-vane Intra-Vane cartridge design, these pumps provide independent dual-circuit output from shaft-end and cover-end sections. They offer excellent drop-in interchangeability with genuine Eaton/Vickers units, matching flange, shaft and port dimensions exactly. Every unit undergoes 100% simulated operating condition testing to verify volumetric efficiency, pressure stability and durability, making them ideal for construction, material-handling and mobile equipment systems.

Technical Specifications 

• Models: 2520VQ, 3520VQ, 4520VQ, 4525VQ, 4535VQ series (examples: 3520VQ45A9, 3520VQ45A10, 3520VQ45A11)
• Series: Eaton Vickers VQ tandem fixed-displacement vane pump
• Typical shaft-end geometric displacement:
  • 2520VQ: approx. 40.2–67.5 cm³/r (codes 12–21)
  • 3520VQ: approx. 81.6–121.6 cm³/r (codes 25–38)
  • 4520VQ/4525VQ/4535VQ: approx. 138.7–193.4 cm³/r (codes 42–60)
• Typical cover-end geometric displacement: approx. 18.0–67.5 cm³/r (codes 5–21, depending on series)
• Continuous rated pressure: up to 210 bar (3000 psi) with anti-wear mineral oil (175 bar for some larger displacements)
• Peak pressure: approx. 228 bar (3300 psi) intermittent
• Maximum speed: 2520VQ up to approx. 2700 r/min; 3520VQ approx. 2500–2400 r/min; 4520 series approx. 2200 r/min (based on 0 bar inlet pressure)
• Minimum speed: approx. 600 r/min
• Control type: Fixed displacement (Intra-Vane cartridge design)
• Rotation: Standard clockwise (viewed from shaft end); counterclockwise optional
• Port configuration: Primarily A (SAE 4-bolt flange)
• Shaft options: Keyed or splined (e.g. type 11)
• Approximate weight: 2520VQ ~20.5 kg; 3520VQ ~34 kg; 4520 series ~43 kg
• Recommended fluid: Anti-wear mineral oil (e.g. SAE 10W)

Key Technical Advantages

• Intra-Vane precision cartridge design: The 10-vane configuration with floating side plates automatically compensates end-face clearance, maintaining high volumetric efficiency and low internal leakage under high pressure.
• High-speed and high-pressure capability: Optimized for mobile duty, continuous pressure reaches 210 bar with maximum speeds up to 2700 r/min, supporting demanding travel and work circuits.
• Superior interchangeability and serviceability: Cartridge construction allows rapid replacement of rotor, vanes and cam ring; mounting dimensions fully match original Eaton/Vickers pumps for direct drop-in replacement.
• Low noise and extended service life: Hydraulically balanced vane design reduces radial forces and vibration; quality bearings and wear-resistant materials, validated by 100% simulated testing, ensure reliable performance in harsh environments.

Application Areas

Wheel loaders, excavator auxiliary circuits, forklifts and reach trucks, aerial work platforms, refuse and sanitation vehicles, construction machinery dual-circuit hydraulic systems, and mobile hydraulic power units requiring high-speed, high-pressure tandem vane pumps.

Expert Maintenance Tips

Maintain proper shaft alignment to avoid additional radial or axial loads. Keep inlet pressure between 0–0.34 bar gauge (maximum 1.38 bar); inlet depression should not exceed 0.17 bar. Use anti-wear mineral oil and maintain cleanliness (recommended filtration ≤10–25 μm). Periodically inspect cartridge components for wear and replace vanes/cam ring with genuine or equivalent-precision parts. Fully purge air before initial start-up and avoid dry running. Do not exceed rated pressure or speed limits, and control oil temperature within the recommended range to maximize seal and bearing life.