525VQ25A 3520VQ 35VQ25A Vickers Hydraulic Vane Pump Cartridge Kit | High Pressure Pump Core

The high-performance 3525VQ, 3520VQ, and 35VQ series pump core kits (Cartridge Kits) from Chengyuan Hydraulic are engineered specifically as premium replacements for Vickers intra-vane pumps. Each kit includes the cam ring, rotor, vanes, and side plates. Designed for the rigorous demands of mobile equipment, our cartridges feature advanced heat-treated alloy steel and bimetallic plates. Every unit undergoes 100% simulated operational testing to guarantee 100% interchangeability with original Vickers components, ensuring OEM-level pressure stability and flow consistency.

Technical Specifications (Bulleted List)

• Compatible Models: 3520VQ, 3525VQ, 35VQ25A, 35VQ30A, 35VQ38A

• Displacement (Shaft End): $81\text{ cm}^3\text{/r}$ to $121\text{ cm}^3\text{/r}$ (Based on code)

• Rated Pressure: $21\text{ MPa (3000 psi)}$

• Maximum Pressure: $24.5\text{ MPa (3500 psi)}$

• Maximum Speed: $2500\text{–}2700\text{ RPM}$

• Design Type: Intra-vane Cartridge Design

• Rotation: Right-hand (R/CW) or Left-hand (L/CCW) available

• Sealing: Viton (FKM) seals as standard for heat and chemical resistance

Key Technical Advantages

• Intra-vane Technology: The specialized intra-vane design balances the pressure forces on the vanes, which drastically reduces the contact load on the cam ring. This results in superior wear resistance and prolonged component life under high-pressure cycles.

• Bimetallic Flexible Side Plates: Our plates use a high-grade copper-based alloy layer, offering excellent anti-scuffing properties and thermal compensation. This maintains high volumetric efficiency even as hydraulic oil temperatures fluctuate.

• CNC Ground Cam Contours: The cam rings are processed via ultra-precision CNC grinding and deep nitriding, ensuring a smooth vane path that minimizes vibration and produces an exceptionally low noise profile.

• Modular Replacement System: As a self-contained cartridge, it allows for “drop-in” repairs without removing the pump from the vehicle or machine, significantly reducing downtime and maintenance costs.

Application Areas

• Mobile Equipment: Primary hydraulic source for Caterpillar, SANY, and XCMG wheel loaders, graders, and off-highway dump trucks.

• Industrial Machinery: Reliable power units for injection molding machines, die-casting equipment, and scrap metal balers.

Expert Maintenance Tips

• Rotation Check: Always verify that the cartridge rotation (stamped on the cam ring) matches the arrow on the pump housing before final assembly. Reversed rotation will cause catastrophic vane failure.

• Strict Filtration: VQ series cartridges are sensitive to contamination. Maintain system filtration at $20\text{ }\mu\text{m}$ or better, and thoroughly flush the pump housing before installing a new core.

• Pre-Lubrication: Manually fill the cartridge with clean hydraulic oil before closing the pump cover. Never start the pump dry, as this can cause immediate surface damage to the vanes and cam ring.