F11-039-MU-SN-S-000 3703603 Parker Bent Axis Fixed Motor

Product Overview

The F11 series bent-axis fixed displacement piston motors are a flagship product line within the Parker Hannifin hydraulic transmission platform, classified as a heavy-duty fixed displacement motor/pump series. Featuring a 40° bent-axis design with unique spherical pistons, these units are specifically engineered for demanding applications in both open and closed loop circuits. The series originates from the Swedish VOAC (Volvo Hydraulics) lineage, which was acquired by Parker Hannifin in the 1990s, continuing the proven design heritage.

Designed to fully comply with Parker F11 series mounting and interface standards, this motor offers 100% direct interchangeability with original Parker units—enabling plug-and-play replacement without any管路 modifications or adapter plates, significantly minimizing downtime and retrofit costs.

The F11 series covers displacements from 5 to 19 cc/rev, delivering exceptional power density within a compact, lightweight footprint. This model F11-039-MU-SN-S-000 (Part No. 3703603) delivers 38.7 cc/rev displacement, belonging to the original VOAC specification range. The unique timing gear design synchronizes shaft and cylinder barrel rotation, making the F11 series highly tolerant to high ‘G’ forces and torsional vibrations. The laminated piston ring offers important advantages such as low internal leakage and thermal shock resistance. Every unit undergoes 100% factory testing under simulated real-world working conditions, validating pressure, flow, volumetric efficiency, and performance characteristics before shipment—ensuring reliable operation from the very first start.

Model Code Interpretation:

F11-039-MU-SN-S-000 (Part No.: 3703603)

• F11 – Series code: Bent-axis fixed displacement motor/pump (small frame)

• 039 – Displacement size: 38.7 cm³/rev (VOAC original specification code)

• MU – Mounting flange and interface type

• SN – Shaft and seal configuration

• S – Rotation direction and port configuration

• 000 – Specific configuration code (standard version)

Technical Specifications 

F11-039-MU-SN-S-000

• Model: F11-039-MU-SN-S-000

• Part Number: 3703603

• Type: Bent-axis fixed displacement piston motor (heavy-duty)

• Displacement: 38.7 cm³/rev

• Continuous Rated Pressure: 350 bar (5,075 PSI)

• Intermittent Peak Pressure: 420 bar (6,090 PSI)

• Maximum Speed: 5200 r/min

• Shaft-to-Barrel Angle: 40°

• Housing Material: High-strength cast iron

• Maximum Radial Load Capacity: 400 kg (880 lb)

• Maximum Noise Level: 80 dBA

• Medium: Standard hydraulic fluid

• Operating Temperature Range: -40°C to +115°C

• Rotation: Bidirectional

• Mounting Options: SAE / ISO / CETOP standards

F11 Series General Parameters:

• Displacement Range: 4.9 – 19 cm³/rev (standard sizes 5, 6, 10, 12, 14, 19 cc)

• Maximum Speed: Up to 14,000 RPM

• Continuous Working Pressure: Up to 350 bar

• Intermittent Working Pressure: Up to 420 bar

• Shaft-to-Barrel Angle: 40°

Key Technical Advantages

1. 100% Direct Interchangeability – Zero Modification Required

The F11 series is engineered to exact Parker mounting and interface specifications, with identical dimensions, port locations, and shaft end configurations. End users can replace original units directly without any管路 modifications or adapter plates—transforming unplanned downtime into scheduled, rapid maintenance while significantly reducing spare parts procurement costs and equipment downtime losses.

2. Unique Spherical Piston Design with 40° Bent-Axis Configuration

The spherical piston design with pistons positioned at a 40° angle relative to the drive shaft delivers exceptional power density while allowing unusually high shaft speeds—the F11 series achieves maximum speeds up to 14,000 RPM. The compact, lightweight design enables the F11 series to output superior performance within limited installation spaces.

3. Laminated Piston Ring Technology – Low Leakage and Thermal Shock Resistance

The laminated piston ring provides critical technical advantages—low internal leakage and excellent thermal shock resistance. This design significantly improves volumetric efficiency while enhancing reliability under severe temperature fluctuation conditions.

4. Timing Gear Design – High Vibration and Torsional Resistance

The unique timing gear design synchronizes shaft and cylinder barrel rotation, making the F11 series highly tolerant to high ‘G’ forces and torsional vibrations. Heavy-duty roller bearings permit substantial external axial and radial shaft loads. The simple and straightforward design with very few moving parts results in exceptionally high reliability and long service life.

5. Superior Starting Torque and Low-Speed Performance

F11 motors produce very high torque at start-up as well as at low speeds. The unique piston locking, timing gear, and bearing setup, combined with a limited number of parts, add up to a very robust design with long service life and proven reliability.

6. 100% Factory Testing Under Simulated Working Conditions

Every F11 series unit undergoes rigorous factory testing under simulated real-world conditions, validating pressure, flow, volumetric efficiency, noise levels, and thermal characteristics across the full operating range. Test media match actual operating conditions, ensuring each unit is ready for immediate installation and reliable operation upon delivery—eliminating the risk of “dead on arrival” components.

Application Areas

The F11 series motors are widely deployed across the following industries and equipment types:

• Construction Equipment: Excavator travel/swing drives, skid steer loaders

• Road Construction: Roller travel drives, asphalt pavers

• Saw and Forestry Machinery: Saw motor versions extensively validated in extreme applications

• Mining Equipment: Mining machinery, drilling rigs

• Agricultural Machinery: Combine harvesters, tractors

• Marine & Shipbuilding: Marine winches, deck machinery, hatch covers

• Industrial Equipment: Industrial conveyors

• Coil Tubing: Oilfield equipment

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness Management

The F11 series utilizes bent-axis piston designs with minimal clearances between pistons and cylinder bores, making them highly sensitive to fluid contamination. It is recommended to install filters with ≤10μm filtration rating, maintaining fluid cleanliness to ISO 4406 19/17/14 or better. Operating temperature range is -40°C to +115°C with recommended viscosity range 8–1000 cSt. Never use degraded or substandard hydraulic fluids.

2. Case Drain and Backpressure Control

Ensure the case drain line is unrestricted with no flow restrictions. Excessive case backpressure will cause shaft seal damage and premature bearing failure. The drain line should return directly to the reservoir, not in parallel with the return line. Recommended case backpressure should not exceed 20–30 bar.

3. Air Bleeding and Pre-filling Before Start-up

Always bleed air from the motor housing via the highest vent port before initial start-up or after extended shutdown periods to prevent cavitation damage. Ensure the motor housing is completely filled with hydraulic fluid prior to starting.

4. Coupling Alignment Requirements

Maintain shaft alignment within 0.05 mm concentricity and 0.5° angular deviation between the drive shaft and the load shaft. Excessive misalignment will lead to premature bearing wear and shaft seal leakage. The use of flexible couplings is recommended to compensate for minor installation deviations.

5. Rotation Direction Confirmation

The F11 series features bidirectional rotation. Verify that the system circuit direction matches the required rotation direction before installation—reversing fluid flow will reverse the motor’s direction of rotation.

6. Periodic Inspection and Maintenance

Inspect shaft seals for leakage and listen for abnormal operating noise every 1,000 operating hours or every 6 months (whichever comes first). If reduced volumetric efficiency or insufficient output torque is observed, timely overhaul of the piston assembly and valve plate is recommended.

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