421AK00391A Eaton 420 Series Mobile Piston Pump 62 cm³ 280 bar

Model Number	421AK00006A, 421AK00005B, 421AK01062B, 421AK00593C, 421AK00391A

Product Description

Product Overview

The 421AK00391A, 421AK00006, 421AK00593C, 421AK01062B, 421AK00005B and 421AK00006A belong to the Eaton / Danfoss 420 Series (X20 / ADU) open-circuit mobile variable displacement axial piston pumps. Designed specifically for mobile equipment, these swash-plate pumps feature pressure-compensated and load-sensing control options. Flow is proportional to drive speed and displacement and is infinitely variable. Fully interchangeable with genuine Eaton / Danfoss units, they enable direct drop-in replacement without modification to mounting interfaces or piping. Every unit undergoes 100% simulated operating-condition testing to ensure reliability and long service life under heavy-duty mobile conditions.

Technical Specifications

Model: 421AK00391A / 421AK00006 / 421AK00593C / 421AK01062B / 421AK00005B / 421AK00006A (420 / X20 / ADU series)
Displacement: Common sizes 41 / 49 / 62 / 80 cm³/rev (specific models typically approx. 62 cm³/rev)
Continuous / Rated Pressure: up to approx. 280 bar (4060 psi)
Peak / Intermittent Pressure: up to approx. 320 bar (4600 psi)
Maximum Speed: approx. 2600–3600 rpm (depending on size and inlet conditions)
Control Type: Pressure compensator / pressure-flow compensator (load sense), code dependent
Design: Swash-plate axial piston, open circuit
Mounting: SAE B or C flange (2/4-bolt)
Brand / Series: Eaton / Danfoss 420 Series Mobile Piston Pump

Key Technical Advantages

Mobile-Equipment High-Pressure Design: Continuous rating of approx. 280 bar and intermittent up to 320 bar, optimized for loaders, excavators and other mobile machines with high power density.
Pressure / Load-Sensing Controls: Pressure-compensated and flow-compensated options enable efficient power management, reducing system heat and energy consumption.
Fast Response & Low Noise: Industry-leading response and recovery times combined with optimised flow paths for reduced operating noise and improved operator comfort.
Robust Bearings & Extended Life: High-load-capacity bearings and stiff drive shaft design deliver B10 bearing life of several thousand hours under rated mobile conditions.
True Interchangeability & Flexible Configuration: Fully compatible with OEM mounting dimensions and ports. Multiple shaft, flange and control options support rapid replacement.

Application Areas

Main or auxiliary pumps on wheel loaders and excavators
Agricultural tractors and construction machinery hydraulic systems
Concrete pump trucks and asphalt pavers
Dump truck lifts and container handling equipment
Any mobile hydraulic system requiring open-circuit pressure-compensated performance

Expert Maintenance Tips

Ensure proper flange alignment during installation; use a flexible coupling and avoid excessive radial/axial loads. Verify correct rotation and suction/pressure port connections.
Use anti-wear hydraulic oil meeting ISO cleanliness (recommended 21/18/13 or better) and viscosity requirements; system filtration should be at least 10 μm. Thoroughly bleed air before initial start-up.
Regularly monitor inlet pressure and case pressure to prevent cavitation or over-pressure. Verify compensator settings and system response.
During service, inspect pistons, cylinder block and valve plate for wear; replace complete rotating groups when necessary. Store long-term units in a dry environment and rotate the shaft periodically.

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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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