The A2FM Rexroth Piston Motor: Fixed Displacement Bent-Axis for Heavy-Duty Hydraulic Applications

The A2FM Rexroth Piston Motor stands as one of the top fixed displacement axial piston motors in the world hydraulic field. Its basic bent-axis setup keeps giving strong power density, mechanical efficiency, and lasting strength in tough open-circuit and closed-circuit hydrostatic drive systems.

Core Working Principle and Bent-Axis Engineering of the A2FM Rexroth Piston Motor

The A2FM Rexroth Piston Motor has an axial tapered piston rotary group in a bent-axis setup at its center. Hydraulic pressure on the pistons makes a force part. This turns into torque via the slanted cylinder block. So, this shape gives smooth turn, high start torque, and low pulsation even at slow speeds.

The motor uses a single-piece tapered piston with built-in sealing rings. This cuts internal leakage a lot over many swashplate-type motors. Output speed ties straight to inlet flow. Output torque ties straight to the pressure gap across high- and low-pressure ports. This straight and expected action fits the A2FM Rexroth Piston Motor well for jobs needing exact speed and torque control.

Comprehensive Technical Specifications of the A2FM Rexroth Piston Motor Series

The A2FM Rexroth Piston Motor line covers a very broad displacement range from 5 cm³/rev to 1000 cm³/rev. Usual models include:

A2FM5, A2FM10, A2FM12, A2FM16, A2FM23, A2FM28, A2FM32, A2FM45, A2FM56, A2FM63, A2FM80, A2FM90, A2FM107, A2FM125, A2FM160, A2FM180, A2FM200, A2FM250, A2FM355, A2FM500, A2FM710, A2FM1000.

Pressure work changes by frame size:

• Size 5: nominal 315 bar / peak 350 bar
• Sizes 10–200: nominal 400 bar / peak 450 bar
• Sizes 250–1000: nominal 350 bar / peak 400 bar

Most models allow two-way turn. They work well in both open-loop and closed-loop circuits. Many sizes give high-speed ability (up to 5000–6000 rpm in small displacements). So, the series fits many needs.

Standout Performance Features of the A2FM Rexroth Piston Motor

Some design traits make the A2FM Rexroth Piston Motor stand out:

• Strong power-to-weight ratio from the small bent-axis layout
• High overall efficiency (often 92–96% in the best work zone)
• Good low-speed smoothness and high start torque (usually >95% of theory)
• Low noise and vibration levels from even piston forces
• Long service life even in steady high-pressure work cycles
• Wide temperature work range with right fluid pick

These pluses make the motor good for gear that needs steady work under changing load and speed states.

Typical Industrial and Mobile Applications of the A2FM Rexroth Piston Motor

The A2FM Rexroth Piston Motor sees wide use in many areas:

• Construction machinery: crawler excavators, wheel loaders, crawler cranes, piling rigs, concrete pump trucks
• Agricultural equipment: large self-propelled sprayers, forage harvesters, sugarcane harvesters
• Mining and quarrying: underground loaders, drill rigs, continuous miners
• Material handling: reach stackers, heavy forklifts, port cranes
• Marine and offshore: winches, crane drives, propulsion auxiliaries
• Industrial stationary drives: shredders, mixers, rolling mill auxiliaries, test rigs

Its skill to handle high shock pressures, often direction shifts, and dirty settings helps its good name in these spots.

Bent-Axis vs Swashplate – Why Many Engineers Still Prefer the A2FM Design

Swashplate motors lead in the variable displacement market. But the fixed displacement A2FM Rexroth Piston Motor keeps clear pluses in many jobs:

• Higher mechanical efficiency at full displacement (less rub from piston-to-shoe link)
• Better hold against contaminant wear from easier moves
• Strong cold-start performance and low-speed torque give
• More hold to pressure spikes and cavitation states
• Simpler build leads to easier field fix in far spots

For fixed-speed or fixed-ratio drive systems where variable displacement is not needed, the bent-axis A2FM often stays the most steady and low-cost long-term pick.

Energy Efficiency and Total Cost of Ownership Considerations

Today’s hydraulic system builders stress energy use more. The A2FM Rexroth Piston Motor helps well in some ways:

• High volumetric and mechanical efficiency cuts heat make and power loss
• Lower heat load lets smaller cooling systems
• Cut fuel use in diesel-powered mobile machines
• Longer oil change times from lower heat stress
• High strength cuts unplanned down time and swap costs

Over a 10–15 year gear life cycle, these points often make the A2FM series cheaper than low-start-cost choices.

Installation, Mounting, and System Integration Best Practices

The A2FM Rexroth Piston Motor gives many mounting flange and shaft picks (ISO, SAE, DIN, splined, keyed). This helps join into current gearboxes, track drives, winches, and pump-motor mixes.

Main install tips include:

• Right alignment to skip side load on the shaft
• Enough case flush flow in closed-circuit jobs
• Correct drain line size and back-pressure limit
• Setup of good filtration (often 10 μm or better)
• Use of advised mineral oils or synthetic hydraulic fluids

These steps boost service life and keep top work over the motor’s run life.

Maintenance Strategies to Maximize Service Life of A2FM Rexroth Piston Motors

The A2FM Rexroth Piston Motor is known for strength. But active upkeep stays key:

• Regular check of hydraulic fluid clean (ISO 4406 18/16/13 or better)
• Time-based look at case drain flow rate (rising flow often shows inner wear)
• Check of shaft seal state in normal service
• Avoid long stop without time-based turn
• Use of real or good match spare parts in fixes

Many users reach 10,000–20,000 run hours before big fix when right upkeep rules are kept.

POOCCA has set up as a professional manufacturer, supplier, and factory focused on high-work hydraulic piston motors.

This includes exact-made matches to the full A2FM Rexroth Piston Motor line. With good R&D skills, tight quality control, and send know-how to over 120 countries, POOCCA gives steady, low-cost fixes backed by full tech papers and quick after-sales help.

FAQ

What displacement range does the A2FM Rexroth Piston Motor cover?

From 5 cm³/rev to 1000 cm³/rev, offering 22 standard sizes.

What are the maximum continuous pressure ratings?

400 bar for most sizes 10–200 and 350 bar for larger sizes 250–1000.

Can the A2FM Rexroth Piston Motor be used in closed-loop systems?

Yes, most models are fully suitable for both open and closed hydrostatic circuits.

Why do many heavy-duty applications still choose bent-axis motors?

They offer higher mechanical efficiency, better low-speed performance, greater tolerance to contamination, and superior durability under shock loads.

Are replacement motors fully interchangeable with original Rexroth A2FM units?

High-quality equivalents match mounting dimensions, port sizes, performance curves, and key technical parameters for drop-in replacement.

Which industries benefit most from the A2FM Rexroth Piston Motor?

Construction, mining, agriculture, material handling, marine, and heavy industrial equipment manufacturing.

Source Reliable A2FM Rexroth-Compatible Piston Motors from a Professional Manufacturer & Supplier

System joiners, and hydraulic sellers seeking steady quality, fair price, and firm supply of A2FM series motors can team with POOCCA.

As a focused manufacturer, supplier, and factory, POOCCA gives full-range match, custom shaft/flange picks, quick lead times, and full tech talk.

Reach out today via email at sales@kamchau.com, phone/WhatsApp +86 18927498997, or the website contact form to request quotations, samples, performance curves, or 3D models for your next production project or aftermarket program.