F11-019 Parker Fixed Displacement Piston Motor

F11-019-MB-WJ-K-000

Product Overview

The Parker F11-019-MB-WJ-K-000 is a fixed displacement bent-axis axial piston motor designed for high-performance hydraulic drive applications. The F11 architecture uses a 40° shaft-to-cylinder-barrel arrangement, spherical pistons, laminated piston rings, synchronized gearing and heavy-duty roller bearings.

This architecture combines compact packaging, high power density and robust mechanical support for demanding mobile and industrial hydraulic systems. Parker documentation confirms the F11 as a heavy-duty fixed-displacement motor/pump platform suitable for both open- and closed-loop applications.

Technical Specifications

• Model: F11-019-MB-WJ-K-000
• Brand / Series: Parker F11
• Type: Fixed Displacement Bent-Axis Axial Piston Motor
• Displacement: 19.0 cm³/rev
• Maximum intermittent pressure: 420 bar
• Maximum continuous pressure: 350 bar
• Current Parker F11-19 maximum intermittent speed: 9,000 rpm
• Current Parker F11-19 maximum continuous speed: 8,100 rpm
• Minimum continuous speed: 50 rpm
• Theoretical torque at 100 bar: approximately 30.2 Nm
• Theoretical flow at 1,000 rpm: 19.0 L/min
• Control: Fixed displacement
• Weight: approximately 11 kg, depending on configuration

Parker’s historical service manual lists a different speed rating for the earlier F11-19 version: 7,500 rpm maximum and 5,400 rpm continuous. For replacement work, the applicable product revision and nameplate must therefore be checked before the motor is approved for the target speed.

Key Technical Advantages

• 40° bent-axis architecture: provides a compact power transmission layout with high specific power.
• Spherical piston design: supports smooth piston movement and efficient mechanical power transfer.
• Laminated piston rings: designed to control internal leakage and improve resistance to thermal shock.
• Heavy-duty tapered roller bearings: designed to withstand significant external radial and axial shaft loads.
• Fixed displacement configuration: provides a straightforward hydraulic drive solution without variable-displacement control hardware.

Application Areas

• Construction machinery
• Forestry equipment
• Agricultural machinery
• Industrial hydraulic drives
• Marine deck machinery
• Hydraulic power units
• High-speed rotary drives

Expert Maintenance Tips

Before replacement, verify the complete F11-019-MB-WJ-K-000 code, mounting interface, shaft configuration, hydraulic ports and circuit requirements rather than selecting the replacement only by displacement.

Maintain clean hydraulic fluid and inspect the case drain condition during service. Parker’s service documentation identifies valve plates, cylinder-barrel port surfaces and piston rings as critical wear areas when internal leakage becomes excessive.

F11-039-MU-SN-S-000

Product Overview

The Parker/VOAC F11-039-MU-SN-S-000 is a legacy F11 fixed displacement bent-axis axial piston motor with a nominal displacement of 38.7 cm³/rev. Its 40° bent-axis architecture, synchronized rotating group and heavy-duty bearing system are designed for high-load hydraulic power transmission.

The historical Parker F11 Service Manual specifically lists the F11-39 frame with 38.7 cm³/rev displacement, 420 bar peak pressure, 350 bar continuous pressure and a 5,200 rpm maximum speed.

Technical Specifications

• Model: F11-039-MU-SN-S-000
• Series: Parker / VOAC F11
• Type: Fixed Displacement Bent-Axis Axial Piston Motor
• Displacement: 38.7 cm³/rev
• Maximum intermittent / peak pressure: 420 bar
• Maximum continuous pressure: 350 bar
• Maximum speed: 5,200 rpm
• Maximum continuous speed: 4,200 rpm
• Minimum continuous speed: 125 rpm
• Theoretical torque at 100 bar: approximately 61.6 Nm
• Theoretical flow at 1,000 rpm: 38.7 L/min
• Control: Fixed displacement
• Weight: configuration-dependent; not specified in the cited Parker historical service specification

Key Technical Advantages

• High displacement-to-size ratio: 38.7 cm³/rev provides a strong balance between hydraulic flow demand and output torque.
• High-pressure capability: 420 bar peak and 350 bar continuous ratings support demanding pressure cycles.
• Synchronized rotating group: shaft and cylinder barrel are mechanically synchronized through gearing.
• Heavy-duty bearing support: suitable for hydraulic drives subject to substantial external shaft loading.
• Serviceable mechanical architecture: the F11 design uses relatively few moving parts, simplifying inspection and overhaul.

Application Areas

• Construction machinery
• Forestry equipment
• Agricultural machinery
• Mining equipment
• Lifting equipment
• Industrial rotating drives
• Marine and offshore machinery

Expert Maintenance Tips

When servicing the F11-039, pay particular attention to the timing relationship between the shaft and cylinder barrel. Parker’s service procedure requires correct alignment of the timing marks and correct gear backlash following reassembly.

Do not mix individual worn piston and ring assemblies with components from different wear conditions. Inspect the valve plate, barrel port surface, shaft seal and bearings whenever abnormal internal leakage, noise or torque loss is detected.

F11-058-MB-CN-K-000

Product Overview

The Parker/VOAC F11-058-MB-CN-K-000 is a fixed displacement bent-axis axial piston motor with a nominal displacement of 58.2 cm³/rev. It is the larger legacy F11 configuration and is intended for higher-output hydraulic rotary drives.

The Parker historical F11 Service Manual specifies 58.2 cm³/rev displacement, 420 bar peak pressure, 350 bar continuous pressure, 4,500 rpm maximum speed and 3,600 rpm continuous speed for the F11-58 frame.

Technical Specifications

• Model: F11-058-MB-CN-K-000
• Series: Parker / VOAC F11
• Type: Fixed Displacement Bent-Axis Axial Piston Motor
• Displacement: 58.2 cm³/rev
• Maximum intermittent / peak pressure: 420 bar
• Maximum continuous pressure: 350 bar
• Maximum speed: 4,500 rpm
• Maximum continuous speed: 3,600 rpm
• Minimum continuous speed: 125 rpm
• Theoretical torque at 100 bar: approximately 92.5 Nm
• Theoretical flow at 1,000 rpm: 58.2 L/min
• Control: Fixed displacement
• Weight: configuration-dependent; verify against the actual nameplate and mounting configuration

Key Technical Advantages

• High torque potential: 58.2 cm³/rev displacement provides approximately 92.5 Nm theoretical torque at 100 bar.
• High-pressure construction: 420 bar peak and 350 bar continuous pressure ratings are suitable for severe hydraulic duty cycles.
• Leaf-spring barrel retention: Parker specifically identifies the F11-58 as using a leaf spring for cylinder-barrel hold-down, which is important during overhaul and reassembly.
• Heavy-duty bearing system: supports external axial and radial loads on the drive shaft.
• Compact power transmission: the 40° bent-axis layout provides high power density within a relatively compact hydraulic motor architecture.

Application Areas

• Heavy construction equipment
• Mining machinery
• Forestry machinery
• Agricultural equipment
• Hydraulic winches
• Marine deck machinery
• Industrial rotary drives
• Heavy-duty auxiliary hydraulic systems

Expert Maintenance Tips

The F11-058 barrel-retention arrangement requires specific service attention. Parker’s service manual states that the F11-58 uses a leaf spring for cylinder-barrel hold-down. During reassembly, verify the retaining components, timing marks and gear backlash before returning the motor to service.

Monitor case-drain flow as part of preventive maintenance. Excessive drain flow can indicate wear or damage to the valve plate, cylinder-barrel port surface or piston-ring assembly and should trigger a detailed internal inspection.