F11-019-SB-CS-K-425-0000-B0 Parker Hydraulic Motor 19cc 420 bar

Product Overview

The F11-019-SB-CS-K-425-0000-B0 is a bent-axis axial piston fixed displacement motor built on the Parker F11 platform, in the 19 cc displacement size. The F11 series is Parker’s well-proven heavy-duty bent-axis fixed displacement motor/pump series, featuring a unique spherical piston design and gear synchronization structure for efficient, reliable power transmission in both open and closed loop circuits.

The motor delivers a maximum intermittent working pressure of 420 bar (6,090 psi) and continuous working pressure of 350 bar (5,075 psi), with a maximum continuous input flow of 154 L/min and continuous operating speeds up to 8,100 rpm (intermittent up to 14,000 rpm depending on size). Thanks to lightweight pistons and a compact rotating component design, the F11 series maintains excellent volumetric and mechanical efficiency at high speeds, with a maximum noise level of only 80 dBA. The radial load capacity of 400 kg (880 lb) enables the motor to handle considerable axial and radial loads.

The model code F11-019-SB-CS-K-425-0000-B0 decodes as follows: F11 designates the bent-axis fixed motor series, 019 is the displacement size (19.0 cm³/rev), SB is the mounting flange code (SAE B two-bolt flange per SAE J744), CS is the port configuration code (BSPP threaded ports), K is the shaft type code, 425 is the special option code, and 0000-B0 is the seal material and surface treatment code. The motor’s fixed displacement design eliminates the need for variable adjustment mechanisms, offering simple construction 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, shaft specifications, and port locations, enabling drop-in interchangeability. Each unit undergoes 100% simulated load testing prior to shipment, validating output torque and volumetric efficiency against original specifications.

Technical Specifications 

• Model: F11-019-SB-CS-K-425-0000-B0

• 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, gear synchronization

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

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

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

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

• Maximum Continuous Speed: 8,100 rpm

• Maximum Intermittent Speed: 14,000 rpm (size dependent)

• Minimum Continuous Speed: 50 rpm

• Theoretical Torque (Δp=100 bar): 30.2 N·m (22.3 lb-ft)

• 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: FPM (Fluorocarbon rubber)

• Mounting: SAE B two-bolt flange (SAE J744)

• Port Connection: BSPP threaded ports

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

• Weight (approx.): 11 kg (24.2 lb)

• Moment of Inertia: 0.0011 kg·m²

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. The 40° bent-axis configuration achieves high power density within a compact envelope, with a theoretical torque of 30.2 N·m/100 bar at maximum displacement, suitable for heavy-duty applications requiring high torque output.

2. Gear Synchronization and Double Tapered Bearing Reliability

The F11 series features a well-proven gear synchronization mechanism that ensures precise synchronization between the drive shaft and cylinder barrel, eliminating synchronization deviations that can occur in conventional piston motors. 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. This design offers significant advantages in forestry machinery and travel drive applications subject to extreme shaft loads.

3. Lightweight Pistons with High-Speed Capability

The F11 series utilizes lightweight pistons and a compact rotating component design that enables the motor to withstand extremely high speeds—the F11-019 size achieves intermittent speeds up to 14,000 rpm and continuous operating speeds 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. Laminated piston rings further reduce internal leakage, improving overall efficiency.

4. Compact Structure with Multi-Standard Mounting Compatibility

The F11 series motor’s shaft end and mounting flange conform to ISO, SAE, and CETOP standards, enabling easy integration into various hydraulic systems. This model features SAE B two-bolt flange mounting (SAE J744 standard), BSPP threaded ports, and FPM fluorocarbon seals suitable for high-temperature and chemically aggressive media. The motor’s simple construction and maintenance-free design reduce downtime and maintenance costs, applicable in both open and closed loop circuits.

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 cover drives

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

• Industrial Applications: 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.

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. 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.

5. 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.