Parker F11 F12 Hydraulic Motor | F11-039-MU-SN-S-000 | Fixed Displacement Piston Motor

The Parker F11 and F12 Series from LIC Hydraulic represent the pinnacle of Fixed Displacement Bent-Axis technology. Known for their legendary reliability in the most punishing environments, models like the F11-039-MU-SN-S-000 utilize a unique 40-degree angle between the shaft and the pistons. This geometry delivers high efficiency and extreme power density, allowing the motor to handle high-speed rotations and massive pressure spikes. Whether you are replacing a motor on a forestry harvester or a heavy-duty industrial winch, our F11/F12 units provide 100% drop-in interchangeability and world-class performance.

Technical Highlights

• Sizes: F11-039, F11-058, F11-150, F11-250 (up to $250\text{ cc/rev}$).

• Operating Pressure: $350\text{ bar}$ continuous ($420\text{ bar}$ intermittent).

• Max Speed: Up to $8000\text{ rpm}$ (depending on frame size).

• Efficiency: Industry-leading volumetric and mechanical efficiency due to low-friction piston rings.

Core Advantages

• Bent-Axis Durability: The 40° angle minimizes internal stress on the bearings, extending service life in applications with frequent starts/stops and high radial shaft loads.

• Dynamic Speed Range: The F11 series is specifically optimized for high-velocity tasks, making it the preferred choice for saw disc drives where instantaneous torque and high RPM are required.

• Robust Sealing: Equipped with specialized high-pressure shaft seals that can withstand high case back-pressures without compromising integrity.

• Lightweight Design: The spherical piston design and compact housing reduce overall machine weight while maximizing output torque.

Application Areas

• Forestry: High-speed saw motors for harvesters and feller bunchers.

• Maritime: Deck winches, anchor windlasses, and offshore equipment.

• Construction: Vibratory rollers, shredders, and heavy-duty conveyor drives.

• Industrial: High-pressure power units and centrifugal pump drives.

Expert Maintenance Tips

• Mounting Orientation: Always ensure the case drain line is connected to the highest port relative to the motor’s mounting angle. This prevents air pockets that could cause bearing failure.

• Case Pressure Management: Ensure the case drain leads directly back to the tank with minimal back pressure. Excessive case pressure can lead to shaft seal leaks or “unseating” of the internal valve plate.

• Fluid Cleanliness: To maintain the high-precision finish of the bent-axis rotating group, fluid cleanliness should be maintained at ISO 18/16/13 or better.