VQ Series Hydraulic Cartridge Kits: 45VQ57, 45VQ60, 35VQ30, 35VQ35, 25VQ21 Complete Guide

Introduction

The VQ series hydraulic cartridge kits, including models 45VQ57, 45VQ60, 35VQ30, 35VQ35, and 25VQ21, are high-performance replacement components widely used in vane pump systems.

These cartridges are designed to restore hydraulic pump efficiency, improve system stability, and extend equipment service life. They are commonly used in industrial machinery, construction equipment, and mobile hydraulic systems.

What Is a VQ Series Cartridge?

A hydraulic cartridge refers to the core internal working unit of a vane pump, which includes key components such as:

• Rotor

• Vanes (blades)

• Cam ring

• Side plates

• Pressure balancing elements

Instead of replacing the entire pump, users can replace the cartridge to restore full pump performance at a lower cost.

Overview of VQ Cartridge Models

45VQ57 Cartridge

• High displacement design

• Used in heavy-duty hydraulic systems

• Suitable for high-pressure industrial applications

• Excellent durability under continuous operation

45VQ60 Cartridge

• Enhanced flow capacity compared to 45VQ57

• Designed for large hydraulic systems

• Stable performance in demanding working conditions

• Ideal for construction machinery

35VQ30 Cartridge

• Medium-duty hydraulic application

• Compact design with reliable output

• Widely used in mobile machinery

• Good balance between efficiency and cost

35VQ35 Cartridge

• Higher output than 35VQ30

• Improved pressure handling capability

• Suitable for industrial equipment requiring stable flow

25VQ21 Cartridge

• Small displacement cartridge

• Used in light hydraulic systems

• Energy-efficient and low noise

• Ideal for compact machinery

Key Features of VQ Hydraulic Cartridges

1. High Efficiency Performance

VQ cartridges are engineered for:

• Low internal leakage

• Stable volumetric efficiency

• Smooth hydraulic output

2. Easy Replacement Design

• Modular structure

• Quick installation

• No need to replace full pump assembly

3. Wear-Resistant Materials

• High-strength steel components

• Precision-machined vanes

• Long service life under high pressure

4. Wide Compatibility

Compatible with many vane pump systems used in:

• Industrial machinery

• Construction equipment

• Injection molding machines

Working Principle of VQ Cartridge Kits

VQ cartridges operate inside a vane pump using a simple but efficient mechanism:

1. Rotor rotates inside cam ring

2. Vanes slide outward due to centrifugal force

3. Hydraulic oil is trapped between vanes

4. Oil is compressed and discharged under pressure

5. Continuous flow is generated for hydraulic systems

This design ensures smooth, low-noise, and efficient hydraulic power delivery.

Applications of VQ Cartridge Kits

1. Construction Machinery

• Excavators

• Loaders

• Road rollers

Used for stable hydraulic power in lifting and digging systems.

2. Industrial Equipment

• Injection molding machines

• Hydraulic presses

• Die-casting machines

Ensures precise pressure control and cycle stability.

3. Agricultural Machinery

• Tractors

• Harvesters

• Spraying systems

Improves operational efficiency in field environments.

4. Material Handling Systems

• Forklifts

• Conveyor hydraulic systems

• Warehouse lifting equipment

Provides smooth and reliable hydraulic motion.

Advantages of VQ Cartridge Replacement

✔ Cost Saving

Replacing cartridges is significantly cheaper than replacing the entire pump.

✔ Fast Repair

Reduces downtime and improves maintenance efficiency.

✔ Performance Restoration

Restores pump output close to original factory condition.

✔ Extended Equipment Life

Prevents wear from spreading to the full pump assembly.

Common Problems and Solutions

1. Low Pressure Output

Cause: worn vanes or cam ring
Solution: replace cartridge kit

2. Excessive Noise

Cause: air intake or internal wear
Solution: check seals and replace worn components

3. Reduced Flow

Cause: internal leakage
Solution: install new VQ cartridge

4. Overheating

Cause: friction or poor lubrication
Solution: use clean hydraulic oil and inspect components

Maintenance Tips

• Use clean hydraulic oil to avoid contamination

• Replace filters regularly

• Avoid overpressure operation

• Inspect pump condition periodically

• Replace cartridge before complete failure

Why Choose VQ Series Cartridge Kits?

• Stable and reliable hydraulic performance

• Wide model compatibility (25VQ / 35VQ / 45VQ series)

• Easy maintenance and replacement

• High durability for industrial use

• Cost-effective repair solution

Conclusion

The VQ series hydraulic cartridge kits (45VQ57, 45VQ60, 35VQ30, 35VQ35, 25VQ21) are essential components for maintaining vane pump performance in hydraulic systems.

With their modular design, high efficiency, and strong durability, they provide an economical and reliable solution for pump repair and system maintenance across industrial, construction, and agricultural applications.