L2F63R2P3 Liyuan Hydraulic Motor 63cc 32MPa Bent Axis

Product Overview

The L2F63R2P3 is a bent-axis fixed displacement axial piston motor/pump built on the Liyuan L2F series platform, in the 63cc displacement size. The product features a bent-axis design with spherical porting technology, specifically engineered for hydrostatic drives in both open and closed circuits, operable as either a motor or a pump.

The L2F series is a representative product line of Liyuan Hydraulic (AVIC Liyuan) bent-axis fixed displacement piston pumps/motors, with a displacement range covering 10 to 500 mL/r, including 10, 12, 23, 28, 45, 55, 63, 80, 107, 125, 160, 250, and other specifications. The series employs spherical porting between the cylinder block and port plate that self-centers during rotation, minimizing circumferential velocity and maximizing efficiency. The drive shaft is capable of withstanding radial loads, and the product operates with low noise, widely used in open and closed hydraulic systems for metallurgy, mining, petroleum, construction, engineering machinery, railway, marine, plastics processing, and other industries.

The L2F63R2P3 offers a nominal pressure of 32 MPa, operates within a temperature range of 30–90°C, and features flange mounting. This model is a medium-displacement specification in the L2F series, with extensive application validation in travel drives, winch drives, and swing drives for construction machinery. The L2F series has a model correspondence with the Rexroth A2F series, with L2F63 corresponding to A2F63, enabling interchangeability in mounting dimensions and performance parameters.

Engineered as a form-fit-function replacement for original Liyuan L2F63 series motors, this model maintains identical mounting flange dimensions, shaft specifications, and port locations, enabling drop-in interchangeability without modification to the host machine’s mounting interface or hydraulic circuit. Each unit undergoes 100% simulated load testing prior to shipment, validating output torque and volumetric efficiency against original specifications.

Technical Specifications 

• Model: L2F63R2P3

• Series: Liyuan L2F Bent-Axis Fixed Displacement Piston Pump/Motor Series

• Product Type: Bent-axis axial piston fixed displacement motor/pump

• Design Feature: Bent-axis configuration, spherical porting, fixed displacement

• Displacement: 63 mL/r (63 cc/rev)

• Nominal Pressure: 32 MPa (320 bar / 4,641 PSI)

• Operating Temperature: 30–90°C

• Mounting: Flange mounting

• Hydraulic Fluid: Hydraulic oil

• Rotation: Right-hand (R)

• Material: Cast iron

• Circuit: Open circuit / Closed circuit

• Compatible Model: A2F63 series (interchangeable in mounting interface and performance parameters)

Data Limitation Note: Detailed parameters such as rated pressure, peak pressure, maximum speed, and volumetric efficiency for the L2F63R2P3 were not found in publicly available search results. L2F series product descriptions mention “rated working pressure up to 21 MPa, maximum working pressure up to 25 MPa,” while multiple supplier pages indicate a nominal pressure of 32 MPa for the L2F63. It is recommended to obtain the complete technical manual from Liyuan Hydraulic or an authorized dealer for final confirmation. The corresponding Rexroth model for the L2F63 is A2F63; the Rexroth A2F series 63cc size offers a nominal pressure of 400 bar (40 MPa) and peak pressure of 450 bar. Performance curves (volumetric efficiency, torque characteristics, etc.) in motor operation should be based on the manufacturer’s official technical manual.

Key Technical Advantages

1. Spherical Porting with Self-Centering Design for High Volumetric Efficiency

The L2F63R2P3 employs spherical porting between the cylinder block and port plate that self-centers during rotation, effectively reducing friction losses and leakage in the porting pair. Compared to flat port plate designs, spherical porting provides superior sealing performance and thermal stability under high-speed and high-pressure conditions, maintaining high volumetric and mechanical efficiency at the nominal pressure of 32 MPa. The self-centering characteristic also reduces the risk of uneven port plate wear, extending the service life of critical moving interfaces.

2. Bent-Axis Design with High Starting Efficiency

The product employs a bent-axis design, with pistons arranged at an angle to the drive shaft, transmitting torque through spherical contact between tapered pistons and the drive plate. The bent-axis configuration delivers high mechanical efficiency during low-speed starting, with no significant difference between starting torque and running torque, suitable for hydraulic drive scenarios requiring frequent start-stop and heavy-load starting. The product is suitable for both open and closed circuits; when used as a motor, output speed is proportional to flow and inversely proportional to displacement.

3. Drive Shaft Radial Load Capacity

The L2F63R2P3’s drive shaft is specially designed to withstand radial loads, making it suitable for applications with direct belt, gear, or sprocket drives without additional bearing support structures, simplifying system integration. This characteristic offers significant advantages in travel drives and winch drives for construction machinery, reducing component count and potential failure points in the transmission system.

4. Fixed Displacement Stable Output with Low Noise Operation

The fixed displacement design provides constant displacement, simple control logic, and stable operating characteristics. The absence of complex variable adjustment mechanisms reduces system integration complexity and maintenance risk. The product is designed and manufactured with a focus on reducing operating noise; the spherical porting structure and precision-machined piston pairs effectively reduce pressure pulsation and mechanical vibration, suitable for industrial environments with noise level requirements.

Application Areas

• Construction Machinery: Excavator winch drives, swing drives, travel drives

• Metallurgical Equipment: Forging presses, manipulator hydraulic drive systems

• Mining Equipment: Coal mine drills, underground transport equipment

• Petroleum Machinery: Drilling equipment auxiliary drives

• Building Machinery: Concrete mixer truck motors, crane hydraulic systems

• Marine & Railway: Deck machinery, railway maintenance equipment

• Industrial Hydraulics: Hydraulic power units, hydrostatic transmission systems, test bench drives

L2F series fixed displacement piston pumps/motors are widely used in metallurgy, forging machinery, and construction machinery, such as forging presses, manipulators, excavators, cranes, and concrete mixer truck motors.

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness Control: The L2F63R2P3 features precision clearances in the porting and piston pairs. Maintain hydraulic fluid cleanliness at NAS Level 9 or better. Replace hydraulic fluid regularly (every 1,000–3,000 operating hours or six months) to prevent contaminant particles from accelerating port plate wear.

2. Shaft Alignment Requirements: During flange mounting, ensure the coaxiality deviation between the motor shaft and drive-end coupling does not exceed 0.05 mm. Although the drive shaft can withstand radial loads, excessive radial forces will accelerate bearing and shaft seal wear. When installing a splined shaft, ensure the spline mating surfaces are free of burrs and damage.

3. Initial Startup Preparation: Fill the motor housing with clean hydraulic fluid during initial installation to prevent dry friction on piston and porting pairs during startup. The drain port must be connected separately to the reservoir with back pressure not exceeding 0.5 MPa.

4. Temperature Monitoring: Maintain case temperature below 80°C during operation. If temperature rises abnormally, check for system pressure overload or sudden increases in case drain leakage. The operating temperature range is 30–90°C.

5. Periodic Efficiency Testing: Test the motor’s volumetric efficiency every 1,000 operating hours. A leakage increase exceeding 50% of normal value requires inspection of piston pair and port plate wear.

6. Restart After Extended Storage: For motors stored over 6 months, manually rotate the shaft 2–3 revolutions to confirm free rotation, then run at low pressure (5 MPa) under no load for 10 minutes, confirming normal case temperature and leakage before gradually applying load.