Product Overview
The F11-010 Series bent axis fixed displacement axial piston motor is a field-proven small frame hydraulic motor platform from Parker Hannifin, originating from the Swedish VOAC (Volvo Hydraulics) product line acquired by Parker in the 1990s. The series employs a unique spherical piston concept, 40° bent axis angle design, laminated piston rings, and a timing gear mechanism, achieving operating pressures up to 420 bar (6,100 psi) and speeds up to 14,000 rpm, with displacements covering 4.9 to 19 cm³/rev — a global benchmark for high-speed, high-pressure hydraulic transmission.
The specific models covered in this document — F11-010-MB-CH-K209 and F11-010-MB-CV-K-2 — are both F11-010 frame size configurations with 9.8 cm³/rev displacement. The model code follows the Parker standard coding convention: F11 designates the product series; 010 indicates the frame size (9.8 cm³/rev); MB specifies the mounting flange and shaft configuration (CETOP flange, Ø20 DIN 6885 keyed shaft); CH or CV denotes port location and connection specification (SAE/ISO/CETOP standard ports); K indicates the control/valve plate configuration; and 209 or 2 specifies the special option code. The series is suitable for both open and closed loop circuits and can function as either a pump or motor depending on system configuration.
The motor is manufactured to original Parker specifications with 100% drop-in interchangeability, requiring no modification to mounting interfaces, port positions, or hydraulic connections. Every unit undergoes 100% simulated operating condition testing at the factory, including rated pressure loading, volumetric efficiency verification, seal integrity assessment, and low-speed smoothness validation prior to shipment.
Technical Specifications
F11-010-MB-CH-K209:
Series / Type: Parker F11 Series bent axis fixed displacement axial piston motor
Displacement: 9.8 cm³/rev (0.598 cu in/rev)
Design: Bent axis, fixed displacement, 40° shaft-to-cylinder barrel angle
Rated continuous operating pressure: 350 bar (5,075 psi / 35 MPa)
Maximum intermittent pressure: 420 bar (6,090 psi / 42 MPa)
Peak pressure: 480 bar (6,960 psi)
Maximum continuous speed: 10,200 rpm
Maximum intermittent speed: 11,200 rpm
Maximum continuous flow: 100 L/min (26 gpm)
Theoretical torque at 100 bar: approximately 15.6 Nm
Direction of rotation: Bidirectional (either A or B port as inlet)
Mounting flange: CETOP 2-bolt flange (Ø100 mm, 125 mm bolt spacing)
Output shaft: Ø20 mm DIN 6885 keyed shaft (K20 configuration)
Ports: G 3/4″
Housing material: High-strength cast iron
Maximum operating temperature: 115°C
Minimum operating temperature: -40°C
Approximate weight: 7.73 kg
F11-010-MB-CV-K-2:
Series / Type: Parker F11 Series bent axis fixed displacement axial piston motor
Displacement: 9.8 cm³/rev (0.598 cu in/rev)
Design: Bent axis, fixed displacement, 40° shaft-to-cylinder barrel angle
Rated continuous operating pressure: 350 bar (5,075 psi / 35 MPa)
Maximum intermittent pressure: 420 bar (6,090 psi / 42 MPa)
Peak pressure: 480 bar (6,960 psi)
Maximum continuous speed: 10,200 rpm
Maximum intermittent speed: 11,200 rpm
Maximum continuous flow: 100 L/min (26 gpm)
Theoretical torque at 100 bar: approximately 15.6 Nm
Direction of rotation: Bidirectional (either A or B port as inlet)
Mounting flange: CETOP 2-bolt flange or ISO/SAE flange (model dependent)
Output shaft: Ø20 mm DIN 6885 keyed shaft or SAE splined shaft (model dependent)
Ports: SAE UN threads or G threads (model dependent)
Housing material: High-strength cast iron
Maximum operating temperature: 115°C
Minimum operating temperature: -40°C
Approximate weight: 7.73 kg
Note: Technical data above is sourced from Parker F11 Series official technical manual, product specification tables, and authorized distributor technical data. The F11-010 features 9.8 cm³/rev displacement, 350 bar continuous working pressure, 420 bar intermittent pressure, and 10,200 rpm maximum speed. The motor is suitable for both open and closed loop circuits with bidirectional rotation capability. For precise configuration parameters of the F11-010-MB-CH-K209 and F11-010-MB-CV-K-2, always confirm against the official Parker technical manual or the product nameplate data.
Key Technical Advantages
1. Unique Spherical Piston Concept with Laminated Piston Ring Technology
The F11-010 employs Parker’s signature spherical piston design, with piston ball ends running directly in output shaft sockets paired with laminated piston rings. The laminated piston ring is constructed from multiple thin steel laminations. The engineering significance of this design lies in its ability to adapt to micro-deformation of the cylinder bore under high pressure, maintaining consistent sealing contact. Under thermal cycling, the laminated construction offers thermal expansion compensation far superior to solid piston rings, effectively suppressing internal leakage. This design maintains high volumetric efficiency across a wide temperature and pressure envelope. Parker service manual specifies that piston rings with more than 50% wear on the spherical surface must be replaced.
2. 40° Bent Axis Design with High Power Density
The F11-010 employs a 40° bent axis angle design, enabling high displacement density and torque output within a compact envelope. Compared to swashplate designs, the bent axis architecture transmits piston force to the output shaft through a shorter, more direct path, yielding higher mechanical efficiency. The compact rotary group design enables the F11-010 to achieve 9.8 cm³/rev displacement capability and 350 bar working pressure in a unit weighing only approximately 7.73 kg, delivering a power-to-weight ratio that leads its class among comparable small-frame motors. The motor delivers sustained high-speed operation with maximum continuous speed of 10,200 rpm, suitable for applications requiring high-speed rotary drives.
3. Timing Gear Mechanism for High G-Force Tolerance
The F11-010 utilizes a unique timing gear mechanism that precisely synchronizes output shaft and cylinder barrel rotation. This timing gear design makes the motor extremely tolerant to high G-forces and torsional vibrations, making it ideally suited for installation on moving machinery subject to frequent shock and vibration loading. The precision meshing of the synchronizing gears ensures that piston reciprocation within the cylinder bores maintains correct phase relationship, preventing piston side-loading and seal failure caused by synchronization errors. Gear backlash is strictly specified by frame size: 0.05–0.20 mm for F11-005 through F11-110.
4. Heavy-Duty Dual Tapered Roller Bearings for High External Load Capacity
The F11-010 output shaft is supported by heavy-duty dual tapered roller bearings, capable of simultaneously accommodating significant radial and axial external loads. The engineering advantage of this bearing configuration lies in its ability to directly absorb radial forces generated by driven components (gears, sprockets, pulleys) without requiring a separate bearing support housing — simplifying system design and reducing installation costs. This characteristic is particularly important for drive applications with sprockets or gears directly mounted on the motor shaft.
5. Open and Closed Loop Circuit Versatility
The F11 Series motor is designed for use in both open and closed loop hydraulic circuits, offering exceptional system adaptability. In open loop circuits, motor rotation is controlled by directional control valves; in closed loop circuits, the motor works with a variable displacement pump to achieve stepless speed regulation. This versatility makes the F11-010 an ideal choice for a wide range of applications from construction machinery to industrial drives. The motor can also function as a pump depending on system configuration, further enhancing component commonality and spare parts management efficiency.
Application Areas
Forestry equipment: Chain saw drives (the F11 Series is extensively applied in this domain thanks to its compact structure and high-speed capability), feller bunchers, skidders, forwarders
Material handling: Deck cranes, hatch cover drives, skid steer loader travel drives
Construction equipment: Rotary drilling rig auxiliary drives, vibratory roller travel drives, excavator auxiliary systems
Oil & gas: Coil tubing units, frac trucks, nitrogen pumpers, drilling platform auxiliary drives
Agricultural machinery: Mowers, cutters, combine harvester auxiliary drives
Industrial drives: Aircraft test stands, constant tension winches, fan drives, dust collectors
Marine and offshore: Deck machinery, windlass drives, marine cranes
Expert Maintenance Tips
1. Fluid Cleanliness Management Is the Primary Task
The F11-010 operates with micron-level clearances between pistons and cylinder bores and between the valve plate and cylinder barrel face. Particulate contamination in hydraulic fluid is the leading cause of piston scoring and valve plate wear. Systems must be equipped with filtration rated to ISO 4406 18/16/13 or better. In high-contamination environments such as forestry or construction job sites, shorten fluid change intervals and increase filter replacement frequency accordingly.
2. Case Drain Flow as a Wear Monitoring Indicator
Case drain flow is a sensitive indicator of internal motor condition. Per Parker service manual procedure: run the unit at normal speed and pressurize the system to 150–200 bar, disconnect the drain line, and measure drain flow for one minute. Compare the measured value against Parker’s baseline specification for a new unit. A significant increase in drain flow may indicate piston-slipper wear or valve plate sealing degradation, warranting timely inspection. Install a spring-loaded check valve (1–3 bar) in the drain line to maintain correct case pressure and lubrication.
3. Pre-Start Case Filling and Air Purging
Before first startup after installation or repair, the motor case must be filled with clean hydraulic fluid through the highest case port until fluid overflows. The F11-010 bent axis architecture creates a complex internal case cavity geometry; starting an un-purged motor can cause dry friction damage to piston ball ends and socket bushings, leading to irreversible premature wear.
4. Piston Ring Wear Inspection and Replacement Criteria
During teardown and repair, inspect the spherical piston rings for wear. Parker service manual specifies that piston rings with more than 50% wear on the spherical surface must be replaced. Additionally, all shaft seals and O-rings should always be replaced during any teardown procedure to ensure sealing reliability. Note: the old spherical piston ring version has been discontinued and must be replaced with the laminated version, along with the corresponding pistons.
5. Installation Alignment and Spline Engagement
The F11-010 uses CETOP or SAE standard flange mounting. During installation, verify that the output shaft is properly aligned with the mating component. While dual tapered roller bearings accommodate substantial external loads, installation misalignment will significantly shorten bearing life. Tighten mounting bolts in stages to the specified torque value, and re-check torque after 500 operating hours.
6. Restart Procedure After Extended Shutdown
If the motor has been idle for more than three months, manually rotate the output shaft to confirm freedom of movement, and inspect the case oil level and shaft seal for leakage before restarting. Extended shutdown can cause oil film drainage from piston-slipper interfaces, creating a dry-start risk. Before restarting, replenish clean hydraulic fluid through the case fill port and operate at low speed and reduced load for 10–15 minutes before returning to normal duty.
