Rexroth fixed displacement hydraulic motor for Liebherr Engineering equipment 10003536 10029304 10337786 5613430 5619045 5801658 592044314

A fixed displacement motor delivers a constant volume of fluid per revolution — unlike a variable displacement motor, its swash plate angle (or bent-axis angle) can't be adjusted on the fly. That fixed geometry means output speed and torque scale directly and predictably with input flow and pressure. There's no proportional control valve moderating displacement internally, which makes these motors simpler, more compact, and mechanically more robust than their variable-displacement counterparts.

For applications where speed doesn't need to change dynamically under load — slewing gear drives, track drives run through a two-speed gearbox, winch drives — a fixed displacement motor is often the more efficient and durable choice.

Why Liebherr Specifies Rexroth Fixed Displacement Motors

Liebherr designs and manufactures a huge share of its own components in-house — including its own FMF series fixed displacement motors — but Rexroth units show up throughout the fleet, particularly on wheeled excavators, mobile cranes, and certain crawler models. A few reasons this pairing is so common across the industry:

1. Power density. Bent-axis motors like the A2FE pack more torque into a smaller envelope, which matters when a motor has to sit recessed inside a slewing gearbox housing.

2. High-pressure tolerance. Series 6 A2FE motors handle nominal pressures up to roughly 400 bar and peak pressures up to 450 bar, giving Liebherr's hydraulic engineers margin for shock loading during swing starts and stops.

3. Open and closed circuit compatibility. The same motor family can be configured for either circuit type, simplifying platform-wide standardization.

4. Integrated valve options. Many variants accept a mounted counterbalance valve, pressure relief valve, or flushing/boost-pressure valve directly on the motor housing — reducing external plumbing and failure points.

5. Global parts and service network. Because Rexroth components are used across Caterpillar, Volvo, Komatsu, and Liebherr fleets alike, technicians and dealers have deep familiarity with diagnostics, seal kits, and rebuild procedures.

Key Technical Specifications to Know

When sourcing or cross-referencing a Rexroth fixed motor for Liebherr equipment, these are the data points that actually matter:

Displacement Size

Expressed in cm³/rev (e.g., size 23, 63, 90). This, combined with pump flow, determines output speed.

Nominal and Maximum Pressure

Series 6x A2FE motors are commonly rated for 400 bar nominal / 450 bar maximum pressure, though this varies by size and version — always confirm against the specific type code (e.g., A2FE23/61W-PAL100-S) and the manufacturer's current data sheet.

Circuit Type

Open circuit (typical for gear-driven auxiliary functions) versus closed circuit (typical for travel and swing drives fed by a variable pump in a hydrostatic loop).

Mounting and Shaft Configuration

Liebherr applications frequently call for a splined or straight shaft matched to the specific gearbox input, plus a flange pattern (SAE or metric) matched to the housing. Getting this wrong is the single most common cause of a "correct part number, wrong fitment" problem in the aftermarket.

Optional Valve Integration

Counterbalance valve (BVD/BVE) — controls overrunning loads

Flushing valve — purges hot oil from the closed circuit for cooling

Boost-pressure valve — maintains minimum case pressure

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Q1: What's the difference between a fixed and variable displacement Rexroth motor?

A1: A fixed displacement motor has a constant swept volume per revolution, so output speed tracks input flow linearly. A variable displacement motor (like the A6VM series) can change its swash angle to alter speed and torque independent of flow, which suits primary travel drives needing a wide speed range.

Q2: How do I know if a fixed displacement motor is failing versus another hydraulic system component?

A2: Isolate the motor by checking the case drain flow and comparing actual output speed/torque against theoretical values calculated from displacement and supplied flow. A significant gap usually points to internal leakage inside the motor rather than a pump, valve, or plumbing issue elsewhere in the circuit.

Q3: What is the price and delivery time of the A10FE/A10FM/A2FE hydraulic motor for Liebherr Engineering equipment？

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4: How to purchase a Liebherr Engineering equipment hydraulic motor?

A4: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.