F1-061-R-000 Parker Bent Axis Motor 59.5cc 400bar

Product Overview

The F1-061-R-000 (manufacturer part number 3781060) is a mid-displacement bent-axis axial piston fixed motor from the Parker Hannifin F1 series, F1-61 frame size. The motor employs a bent-axis axial piston design with a 45° swing angle and spherical piston configuration, suitable for open circuit hydraulic systems, with a rated working pressure of 350 bar (5,000 psi), maximum pressure of 400 bar (5,800 psi), maximum displacement of 59.5 cm³/rev, maximum speed of 2,400 rpm, maximum flow of 143 L/min, output torque of 378 N·m, maximum input power of 83 kW, and weight of approximately 8.5 kg.

The model code decodes as: “F1” = Parker F1 series bent-axis axial piston fixed motor, “061” = 59.5 cm³/rev displacement frame, “R” = right-hand rotation configuration, “000” = standard configuration code. This model is widely used in the hydraulic systems of Volvo FL/FE trucks (2005–2014), Scania P/G/R/T series trucks, and other commercial vehicles. The F1 series motors employ a bent-axis design in which pistons contact the drive plate through spherical ends, replacing the slipper design found in conventional axial piston motors, enabling stable torque output at high rotational speeds.

The F1 series offers complete displacement coverage from 25.6 cm³/rev to 102.9 cm³/rev (F1-25, F1-41, F1-51, F1-61, F1-81, F1-101), with torque ranging from 163 to 653 N·m and weight from 8.5 to 12.3 kg. The series features low noise, low weight, high efficiency, and compact installation dimensions. The motor can be installed above the reservoir level, tolerates rapid temperature changes, and is suitable for continuous operation in demanding truck and mobile hydraulic environments.

The core design advantages of the F1 series derive from the following engineering elements: 45° swing angle (delivering greater piston stroke and torque output compared to 40° designs), optimized end cap construction (improved valve plate force distribution), one-piece cast housing (eliminating rigidity weak points of split-type structures), spherical pistons (enabling high-speed operation), lamellar piston rings (reducing internal leakage), and gear synchronization (ensuring precise synchronization between cylinder barrel and drive shaft).

The motor offers complete interchangeability: mounting flange (ISO 7653 4-hole, 80×80 mm), splined shaft (DIN 5462 / ISO 14 B8×32×36), and port configuration (G 3/4″ BSP) are identical to the original Parker specification, enabling drop-in replacement without hose or bracket modification. Every unit undergoes 100% simulated duty-cycle testing before shipment.

Technical Specifications 

F1-061-R-000 (Primary Model)

• Model: F1-061-R-000

• Manufacturer Part Number: 3781060

• Brand Series: Parker Hannifin F1 Series / F1-61

• Motor Type: Bent-axis axial piston fixed motor, 45° swing angle, spherical pistons

• Maximum Displacement: 59.5 cm³/rev (3.63 in³/rev)

• Rated Working Pressure: 350 bar (5,000 psi)

• Maximum Pressure: 400 bar (5,800 psi)

• Maximum Speed (Self-priming): 2,400 rpm

• Maximum Speed (Short-circuited pump): 2,700 rpm

• Maximum Flow: 143 L/min

• Output Torque: 378 N·m

• Maximum Input Power: 83 kW

• Rotary Group Inertia: 0.00257 kg·m²

• Mounting Flange: ISO 7653 4-hole square flange, 80×80 mm, pilot diameter 80 mm

• Shaft Type: 8-tooth splined shaft, outer diameter 34.9 mm (DIN 5462 / ISO 14 B8×32×36)

• Port Connection: G 3/4″ (BSP)

• Rotation: Right-hand (R configuration)

• Weight: Approximately 8.5 kg

• Mounting Position: Can be installed above reservoir oil level

• Temperature Tolerance: Resistant to rapid temperature changes, tolerates low and high temperature shocks

• Fluid Compatibility: Mineral oil

F1 Series Other Displacement Sizes (Series Reference)

• F1-025-R-000: Max displacement 25.6 cm³/rev, max flow 78 L/min, max pressure 400 bar, output torque 163 N·m, max power 45 kW, max speed 3,050 rpm (self-priming), weight 8.5 kg

• F1-041-R-000: Max displacement 40.9 cm³/rev, max flow 104 L/min, max pressure 400 bar, output torque 260 N·m, max power 61 kW, max speed 2,550 rpm (self-priming), weight 8.5 kg

• F1-051-R-000: Max displacement 51.1 cm³/rev, max flow 125 L/min, max pressure 400 bar, output torque 324 N·m, max power 73 kW, max speed 2,450 rpm (self-priming), weight 8.5 kg

• F1-061-R-000: Max displacement 59.5 cm³/rev, max flow 143 L/min, max pressure 400 bar, output torque 378 N·m, max power 83 kW, max speed 2,400 rpm (self-priming), weight 8.5 kg

• F1-081-R-000: Max displacement 81.6 cm³/rev, max flow 180 L/min, max pressure 400 bar, output torque 518 N·m, max power 105 kW, max speed 2,200 rpm (self-priming), weight 12.3 kg

• F1-101-R-000: Max displacement 102.9 cm³/rev, max flow 216 L/min, max pressure 400 bar, output torque 653 N·m, max power 126 kW, max speed 2,100 rpm (self-priming), weight 12.1 kg

Note: Series parameters are compiled from the Parker F1 series official technical datasheet (Catalogue MSG30-8200/UK).

Key Technical Advantages

① 45° Bent-Axis Design — High Torque Density with Compact Structure

The F1-061-R-000 utilizes Parker‘s signature 45° swing angle bent-axis design, in which pistons are arranged at a 45° angle to the drive shaft, directly transferring pressure into torque. Compared to conventional 40° designs, the 45° swing angle allows pistons to achieve a longer effective stroke within the same cylinder barrel dimensions, delivering greater torque output within the same displacement frame. The bent-axis architecture employs spherical end contact between pistons and the drive plate, replacing the slipper-to-swashplate high-surface-pressure contact of swash plate designs, significantly reducing friction losses and heat generation. This design enables the F1-061 to achieve 378 N·m torque output and 83 kW maximum input power within a compact housing weighing only 8.5 kg, delivering power density far exceeding equivalent swash plate motors.

② Spherical Pistons and Lamellar Piston Rings — Low Leakage, High Speed

The F1-061-R-000 features spherical piston design, with piston ends having spherical geometry that is less affected by centrifugal forces at high rotational speeds. This characteristic enables a maximum self-priming speed of 2,400 rpm and 2,700 rpm in short-circuited pump operation — significantly higher than typical axial piston motors of equivalent displacement. Pistons are equipped with lamellar piston rings that maintain more stable sealing performance under high pressure, effectively reducing internal leakage. Compared to conventional piston-to-bore clearance sealing, lamellar piston rings provide more reliable leakage control under high-pressure conditions, ensuring the motor maintains high volumetric efficiency during long-term operation.

③ Gear Synchronization and One-Piece Cast Housing — Low Noise and High Rigidity

F1 series motors employ gear synchronization to ensure precise synchronized motion between the cylinder barrel and drive shaft, eliminating phase deviation and torque pulsation that can occur in conventional designs. The one-piece cast housing eliminates joint interfaces of split-type structures, enhancing overall casing rigidity and deformation resistance. The optimized end cap construction improves valve plate force distribution, reducing valve plate wear and noise. The combined effect of these engineering designs gives the F1 series significantly lower noise levels than comparable products while improving the housing’s ability to withstand internal and external loads.

④ Compact Lightweight Design with Flexible Installation — Adaptable to Demanding Truck Environments

The F1-061-R-000 weighs only 8.5 kg, with an ISO 7653 standard 4-hole square mounting flange (80×80 mm) and a splined shaft conforming to DIN 5462 / ISO 14 standards (B8×32×36). The compact installation dimensions enable flexible placement within space-constrained truck hydraulic systems. The motor can be installed above the reservoir oil level, providing greater freedom in equipment layout. The F1 series tolerates rapid temperature changes, resisting low and high temperature shocks, making it suitable for continuous operation in outdoor truck and mobile hydraulic equipment.

⑤ Broad Interchange Compatibility and Series Selection

The F1-061-R-000‘s standardized mounting interface (ISO 7653 flange, DIN 5462 splined shaft, G 3/4″ ports) allows direct replacement of equivalent Parker original motors. The F1 series offers complete displacement coverage from 25.6 cm³/rev to 102.9 cm³/rev, enabling users to precisely select displacement size based on specific application torque, speed, and flow requirements. All F1 series motors maintain intra-series compatibility in mounting flange and shaft specifications, facilitating equipment upgrades or displacement adjustments. The series is widely compatible with Volvo FL/FE trucks (2005–2014), Scania P/G/R/T series trucks, and other mainstream commercial vehicles.

Application Areas

• Commercial Vehicles (Primary Application): Hydraulic systems for Volvo FL/FE trucks (2005–2014), Scania P/G/R/T series trucks; cargo cranes, hook loaders, skip loaders

• Specialty Vehicles: Concrete mixers, refuse trucks, vacuum truck systems, dump trucks, multi-purpose vehicles

• Lifting Equipment: Truck mounted cranes, forestry cranes, knuckle boom loaders

• Municipal Equipment: Mowers, rear loaders

• Industrial Transmission: Fan drives, winch drives and other hydraulic transmission systems with moderate shaft side-loading

• Others: Various mobile hydraulic applications not requiring high shaft side-loading

Expert Maintenance Tips

Pre-Installation Inspection: Verify flatness and cleanliness of the ISO 7653 4-hole square flange (80×80 mm) mating surface; check thread condition of mounting bolt holes. The splined shaft (DIN 5462 / ISO 14 B8×32×36) to coupling or drive-wheel fit must conform to standards, avoiding interference fits that could damage the spline. If axial and/or radial forces will act on the shaft, contact Parker Hannifin for technical support. Use bolts of strength class 8.8 or higher, tightened in diagonal sequence to specified torque.

First Commissioning: Parker officially requires that the motor (and the hydraulic system) must be filled with recommended oil before start-up. Fill through the highest casing port until oil overflows from the level port. Dry starting causes metal-to-metal contact between piston-to-bore surfaces and the valve plate without lubrication, resulting in irreversible damage. For installations above the reservoir oil level, ensure suction line sealing integrity and complete air bleeding before startup.

Drain Line Connection: The motor drain port must be connected directly to the tank. It must not share a return line with other circuits or have any back-pressure valve installed. The drain line must remain unobstructed, and case drain pressure should be kept as low as possible to extend shaft seal life.

Fluid Cleanliness and Temperature Control: Maintain system oil cleanliness at NAS 8 (ISO 4406 18/16/13) or better. The bent-axis piston motor’s valve plate and piston pairs are sensitive to particulate contamination; excessive contamination accelerates wear and causes volumetric efficiency degradation. Oil temperature should remain within the recommended range; the F1 series tolerates low and high temperature shocks, but long-term operating temperature should not exceed technical manual limits. Inspect return filter elements regularly and replace per the machine manufacturer‘s recommended interval.

Scheduled Inspection: Check casing drain flow and output shaft spline wear every 500 operating hours. Under normal conditions, drain flow should remain stable; a sustained increase indicates accelerated wear of piston pairs or valve plate surfaces, and preventive maintenance should be scheduled. Also inspect gear synchronization mechanism for abnormal noise or vibration; if torque pulsation or increased noise occurs, inspect the synchronization gear wear condition.

Long-Term Storage Protection: If the motor will be idle for more than 3 months, fill the casing with rust-preventive hydraulic oil and manually rotate the shaft several turns monthly to prevent corrosion or adhesion on piston pairs and valve plate surfaces. Perform a no-load run-in before returning to service.