51D060-RD2-NHSA7BHE1CCA020AANN0516 Parker Hydraulic Motor 60cc 510bar

Product Overview

The 51D series is a key member of the Parker/Danfoss Sauer 51 series of bent-axis axial piston motors. The 51 series features advanced bent-axis design with spherical pistons and synchronizing gears, offering a 5:1 displacement ratio and output speeds up to 7,000 rpm. The 51D series represents the variable displacement motor variants of the 51 family, widely used in closed-circuit hydrostatic transmissions, travel drives, winch controls, and industrial applications.

⚠️ Important Note: According to Danfoss official technical documentation, the 51 series (including 51D, 51V, and 51C) are variable displacement bent-axis piston motors with a 5:1 displacement ratio (maximum : minimum displacement). The “Fixed Displacement” designation in the original title differs from Danfoss official specifications—we present accurate information based on official technical manuals. Our product provides a fully interchangeable direct replacement for the original Parker/Danfoss 51D series motor, with identical mounting dimensions, port specifications, and shaft configurations.

Every unit undergoes 100% simulated duty-cycle testing—performance-validated under rated pressure, peak pressure, and full speed range to ensure volumetric efficiency, mechanical efficiency, torque output, noise levels, and thermal characteristics meet or exceed original OEM specifications.

Model 1: 51D060-RD2-NHSA7BHE1CCA020AANN0516 (Full Model)

Technical Specifications

Base Model: 51D060

• Full Model: 51D060-RD2-NHSA7BHE1CCA020AANN0516

• Max. Displacement (Vg max): 60 cm³/rev

• Min. Displacement (Vg min): 12 cm³/rev

• Displacement Ratio: 5:1

• Max. Pressure: 510 bar

• Max. Speed: 7,000 rpm

• Min. Speed: Approx. 4,400 rpm

• Max. Torque: 0.95 Nm/bar

• Rated Flow: 216 L/min

• Max. Flow: 264 L/min

• Mass Moment of Inertia: 0.0046 kg·m²

• Max. Corner Power: 336 kW

• Housing Material: Cast Iron

• Mounting: SAE 4-bolt flange or DIN flange

• Main Ports: SAE flange

• Controls: Multiple options available (hydraulic, electro-hydraulic proportional, two-position, etc.)

• Weight: Approx. 28 kg

Key Technical Advantages

1. Bent-Axis Design with Spherical Pistons
The 51 series features proven bent-axis design with spherical pistons and synchronizing gears. The spherical piston design minimizes internal leakage while delivering excellent shock and thermal shock resistance.

2. 5:1 Displacement Ratio
The 51D series offers a 5:1 displacement ratio (60 cm³ : 12 cm³). Motors typically start at maximum displacement, providing maximum starting torque for rapid acceleration. This enables flexible adaptation across a wide range of speed and torque requirements.

3. Ultra-High Pressure & Speed Capability
51 series motors withstand system pressures up to 510 bar and deliver output speeds up to 7,000 rpm. The combination of high pressure and high speed delivers exceptional power density in a compact package.

4. Complete Control Family & Versatile Configurations
The 51 series offers a complete family of controls and regulators—hydraulic, electro-hydraulic proportional, two-position, power control, and more. Optional pressure compensator functions in both motor and pump modes. Available in SAE, cartridge, and DIN flange configurations.

Application Areas

• Tracked bulldozer travel drives

• Road construction machinery travel systems

• Wheel drives and railway vehicle running gear

• Winch and hoist systems

• Closed-circuit hydrostatic transmissions

• Compact planetary drive direct-mount applications

Expert Maintenance Tips

1. Shaft seals and all O-rings must be replaced after every disassembly.

2. Pre-lubricate all moving parts with clean hydraulic fluid before assembly.

3. Monitor case drain flow regularly—an abnormal increase indicates potential piston ring or cylinder barrel wear.

4. The 51 series features a 5:1 displacement ratio—verify displacement control mechanism calibration on a test bench after service.

5. Prime the motor housing with hydraulic oil before initial start-up.

6. Ensure hydraulic system filtration meets β₁₀ ≥ 75 to maximize motor service life.

Model 2: 51D080

Product Overview

The 51D080 is the 80.7 cm³ displacement model in the Parker/Danfoss Sauer 51 series, representing the mid-range among the five 51 series sizes. This model provides an ideal transition between the F11-039 (39 cc) and F11-150 (150 cc), combining high-speed capability with ample torque output for medium-to-heavy mobile machinery and industrial drive applications.

Our product provides a fully interchangeable direct replacement for the original Parker/Danfoss 51D080 series motor. Each unit undergoes 100% simulated duty-cycle testing—performance-verified at rated and peak pressures.

Technical Specifications 

• Model: 51D080

• Max. Displacement (Vg max): 80.7 cm³/rev

• Min. Displacement (Vg min): 16.1 cm³/rev

• Displacement Ratio: 5:1

• Max. Pressure: 510 bar

• Max. Speed: 7,000 rpm

• Rated Flow: 250 L/min

• Max. Flow: 323 L/min

• Mass Moment of Inertia: 0.0071 kg·m²

• Max. Corner Power: 403 kW

• Housing Material: Cast Iron

• Mounting: SAE 4-bolt flange or DIN flange

• Main Ports: SAE flange

• Controls: Multiple options available

• Weight: Approx. 32 kg

Key Technical Advantages

1. Optimized Displacement-Power Balance
With 80.7 cm³ displacement, the 51D080 strikes an ideal balance between high-speed capability (7,000 rpm) and torque output—one of the most versatile models in the 51 series.

2. 5:1 Displacement Ratio
The 80.7 cm³ : 16.1 cm³ 5:1 ratio provides exceptional adaptability—from low-speed high-torque to high-speed light-load operation.

3. Ultra-High Pressure & Speed Capability
Withstands system pressures up to 510 bar and delivers output speeds up to 7,000 rpm.

4. Complete Control Family
Offers hydraulic, electro-hydraulic proportional, two-position, and power controls. Optional pressure compensator and flushing valve available.

Application Areas

• Medium tracked construction equipment travel drives

• Road construction machinery and roller travel systems

• Agricultural machinery (large harvesters)

• Industrial closed-circuit hydrostatic transmissions

• Winch and hoist systems

Expert Maintenance Tips

1. Shaft seals and all O-rings must be replaced after every service.

2. Lubricate all moving parts with clean hydraulic fluid before assembly.

3. Monitor case drain flow—a significant increase indicates piston ring wear.

4. Spherical piston rings worn beyond 50% must be replaced immediately.

5. Ensure hydraulic system filtration meets β₁₀ ≥ 75.

Model 3: 51D160

Product Overview

The 51D160 is a large-displacement model in the Parker/Danfoss Sauer 51 series, with 160.9 cm³/rev displacement. As the second-largest of the five 51 series sizes, this model delivers exceptionally high torque output, specifically designed for demanding applications in heavy construction, tracked vehicles, marine, and industrial heavy-duty drives.

Our product provides a fully interchangeable direct replacement for the original Parker/Danfoss 51D160 series motor. Every unit undergoes 100% simulated duty-cycle testing—full-performance validation at rated and peak pressures.

Technical Specifications 

• Model: 51D160

• Max. Displacement (Vg max): 160.9 cm³/rev

• Min. Displacement (Vg min): 32.2 cm³/rev

• Displacement Ratio: 5:1

• Max. Pressure: 510 bar

• Max. Speed: 5,000 rpm

• Min. Speed: Approx. 3,200 rpm

• Max. Torque: 2.56 Nm/bar

• Rated Flow: 402 L/min

• Max. Flow: 515 L/min

• Mass Moment of Inertia: 0.0234 kg·m²

• Max. Corner Power: 644 kW

• Housing Material: Cast Iron

• Mounting: SAE 4-bolt flange or DIN flange

• Main Ports: SAE flange

• Controls: Multiple options available

• Weight: Approx. 56 kg

Key Technical Advantages

1. Ultra-Large Displacement, Maximum Torque Output
With 160.9 cm³/rev delivering 2.56 Nm/bar theoretical torque. Combined with 510 bar operating pressure, this motor delivers exceptionally powerful driving capability—maximum corner power up to 644 kW.

2. 5:1 Displacement Ratio
The 160.9 cm³ : 32.2 cm³ 5:1 ratio maintains high efficiency across a wide range of operating conditions.

3. Proven Bent-Axis Design & Heavy-Duty Bearings
Years-proven bent-axis design with spherical pistons and synchronizing gears. Heavy-duty bearings support substantial external shaft loads.

4. Complete Control Family & Multiple Mounting Configurations
Offers hydraulic, electro-hydraulic proportional, and other controls. Available in SAE, cartridge, and DIN flange configurations for direct integration into compact planetary drives.

Application Areas

• Heavy tracked construction equipment travel drives (bulldozers, excavators)

• Road construction machinery and heavy rollers

• Marine cranes and large winches

• Oil and gas equipment

• Industrial heavy-duty drives (shredders)

• Closed-circuit hydrostatic transmissions

Expert Maintenance Tips

1. Shaft seals and all O-rings must be replaced after every disassembly.

2. Thoroughly lubricate all components with clean hydraulic fluid before assembly.

3. Regularly check case drain flow—an abnormal increase indicates internal wear.

4. Weight is approx. 56 kg—use proper lifting equipment during installation and removal to prevent personal injury or component damage.

5. Ensure hydraulic system filtration meets β₁₀ ≥ 75 to protect precision components.

6. Prime the motor housing with hydraulic oil before initial start-up.