Sauer Danfoss Hydraulic Pumps

08/20/2025

Sauer Danfoss Hydraulic Pumps – 12 Proven Facts and Benefits to Boost Excavator Efficiency

If you are looking for a reliable heart of the working system, Sauer Danfoss hydraulic pumps excel in crawler and wheeled excavators, mini-excavators, and special-purpose machinery. In this guide you’ll find models, structure, components, specifications, and practical applications — all written clearly, with SEO and user experience in mind.

What are Sauer Danfoss hydraulic pumps and how do they work in an excavator?

The pump draws oil from the tank and delivers it under high pressure to valves, cylinders, and hydraulic motors. It converts the power of the diesel engine into hydraulic energy that drives the boom, arm, bucket, and travel drive. Sauer Danfoss hydraulic pumps are known for their efficiency, stable operation, and durability in harsh construction conditions.

Models: Sauer Danfoss hydraulic pumps in practice

H1 Series (H1P / H1B)

Modern axial piston pumps for hydrostatic transmissions in mobile machinery. Wide displacement range, efficient charge pumps, and electronic control options make them ideal for fuel-saving systems.

90 Series (90L / 90R)

A classic in heavy machines. Variable displacement pumps designed for high working pressures and continuous duty. Often paired with 90 Series hydrostatic motors in drive and swing systems.

MP1 Series (MP1A / MP1B)

Compact mobile pumps for medium and smaller machines, perfect for mini-excavators and auxiliary circuits. Lightweight, efficient, and easy to install.

Gear Pumps L / L PLUS

Simple, durable, and economical power sources for auxiliary circuits, cooling systems, or pilot controls. Often complement piston pump assemblies.

Construction and main components

Housing and casing – protects components and maintains alignment.
Cylinder block and pistons – generate flow by reciprocating inside bores.
Swash plate – adjusts angle and pump output, hydraulically or electro-hydraulically controlled.
Valve plate – separates suction and pressure ports, determines flow direction.
Drive shaft and bearings – transmit torque from the engine, minimize friction.
Charge pump and filters – prevent cavitation and maintain oil cleanliness.

Operating principle and control

In axial piston pumps, the shaft rotation forces pistons to move within the cylinder block. The swash plate angle changes piston stroke, regulating flow. Load-Sensing (LS) adapts flow to system demand, while safety valves protect against overpressure.

Applications of Sauer Danfoss pumps in excavators

Travel drive – H1 and 90 Series pumps power hydrostatic motors for smooth start/stop and precise maneuvering.
Swing system – steady and controlled oil flow for smooth upper structure rotation.
Boom, arm, and bucket – accurate control of working cycles.
Attachments – hydraulic hammers, grapples, drills, and shears require proper flow and cooling.

Key advantages of Sauer Danfoss pumps

High durability and reliability in extreme conditions.
Fuel savings thanks to high efficiency.
Precise motion control and smooth operation.
Compatibility with modern electronic controls.

Maintenance and servicing

To ensure long life, follow these rules:

Replace filters and oil at intervals recommended by the machine (usually 2000–2500 hours).
Check for leaks, unusual noise, or overheating.
Use only genuine Sauer Danfoss spare parts for replacements.

Where to buy pumps and spare parts?

The safest option is through authorized distributors and hydraulic service companies. The secondary market offers refurbished pumps, but it’s best to invest in new or factory-remanufactured units.

? Official supplier: Danfoss Power Solutions

FAQ – Frequently Asked Questions

1. Which pumps are most common in excavators?: 90 Series and H1 pumps are most popular due to their performance and reliability.
2. What are typical symptoms of pump failure?: Loss of power, noise, overheating, oil leaks, and slower cylinder response.
3. Are refurbished Sauer Danfoss pumps worth buying?: Yes, if the refurbishment was performed by a certified service provider.
4. How often should hydraulic oil be replaced?: Usually every 2000–2500 working hours, but always follow the manufacturer’s manual.
5. Do Sauer Danfoss pumps fit all excavators?: No, the pump must be matched to the specific hydraulic system and machine model.
6. How to extend pump life?: Maintain oil cleanliness, perform regular servicing, and avoid extreme loads.

Summary

Sauer Danfoss hydraulic pumps are among the most trusted solutions for excavators. Available in multiple series — from simple gear pumps to advanced axial piston units — they guarantee long service life, precise control, and high efficiency. With proper maintenance, they will ensure years of trouble-free operation.