Parker F11 F12 Series Piston Motor & Pump | F11-005 F11-039 F11-058 | Bent Axis

The F11/F12 Series axial piston motors and pumps from Chengyuan Hydraulic are precision bent-axis components fully compatible with Parker industrial standards. Known for their unique spherical piston and synchronizing shaft design, the F11/F12 range (including F11-039, F11-058) excels in maintaining high volumetric efficiency under extreme pressure and speed. Primarily used in both open and closed-loop motor applications, they also function as high-efficiency pumps. Every unit undergoes 100% simulated full-load testing to verify that dynamic response and thermal performance match the original factory specifications, ensuring 100% original-place interchangeability.

Technical Specifications:

• Core Model Codes: F11-005, F11-010, F11-019, F11-039, F11-058, F12-080

• Displacement: 4.9 cm³/rev (005) up to 58.4 cm³/rev (058)

• Nominal Pressure: 350 bar (35 MPa)

• Peak Pressure: 420 bar (42 MPa)

• Max Speed (F11-039): Intermittent up to 4200 rpm

• Rotation: RB (Right), LB (Left), MB (Multi-directional/Bi-rotational)

• Mounting Flange: CN (ISO standard) / 2-bolt or 4-bolt options

• Shaft Ends: K (Metric Keyed), S (Splined)

• Sealing: N (NBR) / V (Viton/FKM for high-temperature use)

Key Technical Advantages:

• Spherical Piston Bent-Axis Design: The F11 features a 40° bent-axis layout with patented spherical pistons. This geometry drastically reduces radial forces between pistons and the cylinder barrel, providing low friction and high starting torque even at 350 bar.

• Synchronizing Shaft Construction: The internal synchronizing shaft ensures precise timing between the cylinder and the drive shaft. This simplified design enhances resistance to vibrations and high-frequency loads compared to swashplate designs.

• Exceptional Power-to-Weight Ratio: Due to its compact bent-axis configuration, models like the F11-039 offer massive torque output while being approximately 40% smaller than conventional motors, ideal for space-constrained mobile machinery.

• Thermal Stability: The housing is cast from fatigue-resistant materials, combined with precision-lapped valve plates. This ensures minimal internal leakage fluctuations across a wide temperature range, providing consistent system performance.

Application Areas:

• Mobile Machinery: Excavator swing drives, harvester header drives, and high-speed saw spindles.

• Industrial Drives: Agitator power heads, test rig drives, and hydraulic winches.

• Specialty Vehicles: Fire truck water pump drives and municipal sweeper fan motors.

Expert Maintenance Tips:

• Case Priming & Venting: Whether configured as a pump or a motor, the case must be filled with clean hydraulic oil through the highest drain port, and all air must be vented before startup.

• Drain Backpressure Control: Ensure the case drain line is unobstructed and returns directly to the tank. Internal case pressure must not exceed 2 bar to prevent shaft seal failure.

• Viscosity Management: For optimal efficiency, maintain working oil viscosity between 20-50 mm²/s. Avoid prolonged operation if viscosity drops below 10 mm²/s due to overheating.