F11-019-MB-WJ-K-000 Parker Hydraulic Motor 19cc 420 bar

Product Overview

The F11-019-MB-WJ-K-000 is a bent-axis axial piston fixed displacement motor built on the Parker F11 platform, in the 19cc displacement size (the largest displacement in the F11 small frame series). The motor features a bent-axis design with a spherical piston rotary group, specifically engineered for high-speed, high-pressure hydrostatic drives in both open and closed loop circuits.

The F11 series is Parker’s well-proven small-frame bent-axis fixed displacement motor/pump series, covering 5 to 19 cm³/rev (F11-005, F11-006, F11-010, F11-012, F11-014, F11-019). The series features a 40° angle between shaft and cylinder barrel for a very compact, lightweight, high power density design. The unique spherical piston design enables operation at unusually high shaft speeds. Working pressures reach up to 420 bar (6,100 psi) and speeds up to 14,000 rpm, widely used in industrial and construction machinery, forestry equipment, and material handling equipment.

The model code F11-019-MB-WJ-K-000 decodes as follows: F11 designates the bent-axis fixed motor series, 019 is the displacement size (19 cm³/rev), MB is the shaft and mounting configuration code, WJ is the control and port type code, K is the seal type code, and 000 is the standard tail configuration code. The motor’s fixed displacement design eliminates the need for variable adjustment mechanisms, offering simple construction, low failure rate, and low maintenance requirements.

Engineered as a form-fit-function replacement for original Parker F11-019 series motors, this model maintains identical mounting flange dimensions (CETOP/SAE/ISO), 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: F11-019-MB-WJ-K-000

• Series: Parker F11 Series Bent-Axis Fixed Displacement Motor/Pump

• Motor Type: Bent-axis axial piston fixed displacement motor

• Design Feature: 40° bent-axis configuration, spherical pistons, laminated piston rings, gear synchronization, double tapered roller bearings

• Displacement: 19.0 cm³/rev (1.16 in³/rev)

• Maximum Intermittent Pressure: 420 bar (6,090 psi)

• Maximum Continuous Pressure: 350 bar (5,075 psi)

• Maximum Intermittent Speed: 14,000 rpm

• Maximum Continuous Speed: 8,100 rpm

• Minimum Continuous Speed: 50 rpm

• Maximum Continuous Input Flow: 154 L/min (40.7 GPM)

• Theoretical Torque (Δp=100 bar): 30.2 N·m

• Radial Load Capacity: 400 kg (880 lb)

• Maximum Noise Level: 80 dBA

• Fluid Temperature Range: −40°C to +115°C

• Optimum Viscosity Range: 15–30 cSt (rated 8–1000 cSt)

• Fluid Cleanliness Level: ISO 20/18/13

• Seal Material: FKM

• Mounting: CETOP / SAE / ISO flange

• Rotation: Clockwise / Counter-clockwise / Bi-rotational

• Weight (approx.): 11.0–13.0 kg

• Circuit: Open circuit / Closed circuit

Key Technical Advantages

1. Spherical Piston Design with Thermal Shock Resistance

The F11 series employs Parker’s unique spherical piston concept, where pistons transmit force through spherical contact with the drive plate, providing large contact area and uniform stress distribution. This spherical piston design gives the motor excellent thermal shock resistance, maintaining stable sealing performance and volumetric efficiency under rapid fluid temperature changes or alternating high-low temperature conditions.

2. High-Speed Capability with Lightweight Piston Design

Thanks to lightweight pistons and a compact rotating component design, the F11-019 withstands extremely high speeds — maximum intermittent speed up to 14,000 rpm and continuous operating speed up to 8,100 rpm. Lightweight pistons reduce reciprocating inertia forces, lowering mechanical vibration and noise levels at high speeds, with a maximum noise level of only 80 dBA. This characteristic makes the F11-019 particularly suitable for chain saw drives, cooling fan drives, and other ultra-high-speed applications.

3. Gear Synchronization and Double Tapered Bearing Reliability

The F11 series features a well-proven gear synchronization mechanism, with a ring gear on the shaft meshing with the cylinder barrel teeth to ensure precise synchronization between the drive shaft and barrel, making the motor highly tolerant to high G forces and torsional vibrations. The double tapered roller bearing configuration enables the motor to withstand radial loads up to 400 kg and considerable axial loads, making it suitable for direct belt, gear, or sprocket drives without additional bearing support structures.

4. Laminated Piston Rings with Low Internal Leakage

The F11 series features laminated piston rings, offering lower internal leakage and superior sealing performance compared to conventional piston rings. This design enables the motor to maintain high volumetric efficiency under high-pressure conditions while reducing fluid heating and extending hydraulic fluid service life. Laminated piston rings also give the motor outstanding thermal shock resistance, maintaining sealing integrity during rapid temperature changes.

Application Areas

• Forestry Machinery: Chain saw drives, feller bunchers, skidders, forwarders

• Construction Machinery: Skid steer loaders, mowers, cutters

• Crane Machinery: Deck cranes, constant tension winches, hatch covers

• Oil & Gas Equipment: Nitrogen pumpers, frac trucks, coil tubing units

• Industrial Applications: Cooling fan drives, dust collectors, aircraft test stands

• Municipal Equipment: Road sweepers, municipal service vehicles

Expert Maintenance Tips

1. Shaft Alignment Requirements: During installation, ensure the coaxiality deviation between the motor shaft and drive-end coupling does not exceed 0.05 mm. Although the F11 series utilizes double tapered roller bearings capable of withstanding substantial radial loads, excessive radial forces will accelerate bearing wear and shaft seal aging. When installing a splined shaft, ensure the spline mating surfaces are free of burrs and damage.

2. Hydraulic Fluid Cleanliness Control: Maintain hydraulic fluid cleanliness at ISO 20/18/13 or better. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually, with filter element filtration accuracy no less than 10 μm. Contaminant particles accelerate spherical piston pair and port plate wear, degrading volumetric efficiency.

3. Viscosity and Temperature Management: The optimum viscosity range is 15–30 cSt (rated 8–1000 cSt). Hydraulic fluid temperature should not exceed +115°C during continuous duty, with a minimum of −40°C. If external housing temperature rises abnormally, check for system pressure overload or sudden increases in case drain leakage.

4. High-Speed Duty Special Notes: The F11-019 experiences high-speed conditions in chain saw drives and cooling fan drives. Inspect motor mounting bolt tightness and case drain leakage every 500 operating hours. If abnormal vibration or noise occurs, check piston pair and bearing wear. To further reduce mechanical losses at high speeds, an optional Power Boost device is available (reduces mechanical losses by up to approximately 15%).

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

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 (10 MPa) under no load for 10 minutes, confirming normal case temperature and leakage before gradually applying load.