Vickers (now a brand under Eaton Corporation) is a well-known manufacturer of hydraulic components, and its gear pumps are widely used in excavators due to their high reliability, compact structure and strong impact resistance. The gear pump series suitable for excavators mainly include the EG series, 26 series, L2 series and B2 series, with specific models and characteristics as follows:

1. EG Series (External Gear Pumps)

The EG series is an external gear pump specially designed for construction machinery such as excavators. It is characterized by low cost, compact structure and strong impact resistance, and provides low-pressure and large-flow hydraulic sources for the travel, slewing and boom mechanisms of excavators, which is suitable for most medium and small excavators.

Core Models:

• EG-10: Displacement range 8-12 mL/r, rated pressure 160 bar, suitable for small excavators (1-5 tons)
• EG-20: Displacement range 18-22 mL/r, rated pressure 160 bar, suitable for medium-sized excavators (5-15 tons)
• EG-30: Displacement range 28-32 mL/r, rated pressure 210 bar, suitable for medium and large excavators (15-25 tons)
• EG-40: Displacement range 38-42 mL/r, rated pressure 210 bar, suitable for large excavators (25-40 tons)

2. 26 Series (Eaton Vickers Gear Pumps)

The 26 series is a single and tandem gear pump launched by Eaton Vickers, which is widely used in the hydraulic system of excavators due to its stable performance and easy maintenance. It can be used as a single pump or combined into a tandem pump to meet the multi-circuit hydraulic needs of excavators.

Core Models:

• 26000 Single Pump: 25506, 25507, 25508 (displacement range 2.61-3.37 mL/r), suitable for small excavator auxiliary hydraulic circuits
• 26000 Tandem Pump: Combined models based on single pump, such as 25506/25507, 25507/25508, suitable for excavator multi-circuit hydraulic systems (e.g., boom + slewing)

3. L2 Series (25500 Type)

The L2 series (model 25500) is a lightweight gear pump designed for low and medium pressure hydraulic systems of excavators. It has the advantages of low noise and high volume efficiency, and is mainly used in the auxiliary hydraulic circuits of excavators (such as cab lifting, bucket cylinder auxiliary control).

Core Models:

• 25500-RSA: Right-hand rotation, displacement 2.5 mL/r, rated pressure 210 bar
• 25500-RSB: Right-hand rotation, displacement 5.0 mL/r, rated pressure 210 bar
• 25500-LSA: Left-hand rotation, displacement 2.5 mL/r, rated pressure 210 bar (adapt to different rotation direction requirements of excavator hydraulic systems)

4. B2 Series (25300 Type)

The B2 series (model 25300) is a durable gear pump suitable for harsh working conditions of excavators. It has strong wear resistance and can adapt to the dust, vibration and other complex environments of construction sites. It is often used in the main hydraulic circuits of medium and large excavators.

Core Models:

• 25300-BSA: Single pump, displacement 6.0 mL/r, rated pressure 240 bar
• 25300-BSB: Single pump, displacement 8.0 mL/r, rated pressure 240 bar
• 25380-B2 Tandem Pump: Tandem structure, such as 25300-BSA/25300-BSB, suitable for large excavator main hydraulic circuits

Note: The specific models and parameters of Vickers gear pumps for excavators may vary according to the excavator model, working conditions and hydraulic system requirements. For accurate model selection, it is recommended to refer to the official technical manual or consult Eaton Vickers authorized suppliers.