Rexroth A20VG45 Hydraulic Piston Pump | AA20VG45 Excavator Pump Replacement

Model Number	R902202737 A22VG045HT1003M1/40BRNB2S73UB2S5A-S

Product Description

Genlu Hydraulic proudly introduces our A20VG45 Series closed-loop axial piston pumps, the robust power core designed specifically for excavator hydraulic travel and work-tool circuits. This series serves as a precise match for Rexroth technical specifications, encompassing the A20VG45 model, and ensuring perfect compatibility for part number R902202737 and complex configurations like A22VG045HT1003M1/40BRNB2S73UB2S5A-S. Genlu unequivocally guarantees 100% Drop-in Interchangeability in mounting flanges, splined drive shafts, charge pump interfaces, and high-pressure port layouts. Backed by our uncompromising 100% Simulation Load Testing, each pump is validated for suction stability, charge pressure balance, and dynamic response under rated speed and load before dispatch, ensuring relentless, high-performance power delivery for your hydraulic systems.

Technical Specifications

Product Series: Rexroth A20VG Series Axial Piston Pump (Closed-Loop)
Representative Models: A20VG45, R902202737, A22VG045HT1003M1/40BRNB2S73UB2S5A-S
Displacement: 45 cc/rev
Rated Operating Pressure: 350 bar (5000 psi)
Max Peak Pressure: 400 bar (5800 psi)
Max Speed: 3300 rpm (Charge pressure-dependent)
Control Mode: Hydraulic proportional control with pressure compensation (HT)
Charge Pump: Integrated charge pump unit

Key Technical Advantages:

Superior Closed-Loop Dynamic Response: Specifically engineered for closed-loop circuits, the high-response integrated charge pump ensures rapid oil replenishment during frequent directional changes. This effectively eliminates cavitation risks, significantly extending the service life of the main pump.
High-Pressure Fatigue-Resistant Architecture: Pistons and cylinder bores are precision-honed to nano-tolerances, maintaining minimal internal leakage even at 400 bar peak pressure. Reinforced castings provide excellent thermal stability, preventing deformation under extreme heat and load cycles.
Integrated Proportional Control: Built-in proportional valve sets provide ultra-smooth flow regulation, offering precise, shock-free maneuverability for excavator operations, which greatly enhances operator comfort and positioning accuracy.
Heavy-Duty Bearing System: The input shaft features high-load tapered roller bearings designed to handle the massive combined radial and axial loads generated on rugged terrain, ensuring stable drive-end operation and structural integrity.

Application Areas:

Crawler Excavators: Travel motor drive systems, swing drive control.
Compact Construction Equipment: Road rollers, small graders.
Industrial Specialty Vehicles: Hydrostatic drive units requiring closed-loop circuit configurations.

Expert Maintenance Tips:

Charge Pressure Criticality: “Starvation” is the primary cause of closed-loop pump failure. Always monitor charge pressure via the diagnostic port; ensure it remains within the 15-25 bar range (depending on spec). Insufficient charge pressure leads to slipper separation and premature surface scoring.
Fluid Cleanliness Standard: Closed-loop pumps are extremely sensitive to contaminants. Maintain ISO 4406 17/15/12 fluid cleanliness. Replace system-specific filters regularly; never use non-specialized hydraulic fluids.
Cold Start Protocol: In cold weather, perform a 5-10 minute low-speed warm-up cycle. Allow hydraulic fluid to circulate fully to prevent internal starvation caused by high oil viscosity.

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Company Profile

Frequently Asked Questions

1.What ls our Main Products?

1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts

2. What about the MOQ?

MOQ: 1pcs— we support sample and small quantity orders.

3.What are your advantages?

Adhere to quality first.
Support customization, ODM & OEM service.
1-year warranty and complete after-sales support.
Safe and fast shipping worldwide.
24-hour online service for your inquiries.

4.Are you a manufacturer? What’s your delivery time?

Yes, we are a manufacturer with our own factory.

Common models are in stock, and orders are usually shipped within 1–3 days.

5.Which payment methods are accepted?

We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.

For full orders: 30% deposit, balance before shipment.

For small/sample orders: full payment in advance.

6.How will you deliver my goods?

We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.

All deliveries ensure door-to-door fast and safe service.

7.How do you inspect and guarantee your products?

All products are tested before shipment to ensure perfect working condition.

We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.

8.What about after-sales service?

If you encounter any problem during use, please contact your sales manager or our support team at any time.

We will respond quickly and help solve the issue efficiently.

9.What are your main applications?

Hydraulic systems
Agricultural machinery
Construction machinery
Automobile industry
Local distributors and maintenance centers

10.Can I get a discount for bulk orders?

Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.

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