51V160 Sauer Danfoss Bent Axis Piston Motor 160cc 420bar

Product Overview

The 51V160-RC8N-F2A1-ANE2-DAA-052AANN-0328-034 is a large-displacement bent-axis variable piston motor from the Sauer Danfoss (now Danfoss Power Solutions) Series 51 range, 51V160 frame size. With a displacement range of 32.2–160.9 cm³/rev, a 5:1 control ratio, maximum working pressure of 420 bar, peak pressure of 480 bar, maximum speed of 5000 rpm, rated flow of 402 L/min, and maximum flow of 515 L/min. The model code decodes as: “51V” = Series 51 variable motor, “160” = displacement frame, “RC8N” = control and regulator configuration, “F2A1” = mounting flange and shaft specification, “ANE2” = port configuration, “DAA” = additional function code, “052AANN-0328-034” = factory serial and custom code.

The 51V080-1-RS1NE1B1NNU1NNN047AAG0-0000 belongs to the same series at a mid-range displacement, with maximum displacement of 80.7 cm³/rev, minimum displacement of 16.1 cm³/rev, maximum working pressure of 510 bar, maximum speed of 7000 rpm, and weight of approximately 32 kg. This model suits drive applications requiring higher rotational speeds and a more compact installation envelope.

Series 51 motors employ a bent-axis design with spherical pistons, primarily intended for combination with other products in closed-loop systems to transmit and control hydraulic power. Motors normally start at maximum displacement, providing maximum starting torque for high acceleration, then reduce displacement as speed increases. The 51V version is equipped with proportional control, enabling stepless displacement regulation.

The motors offer complete interchangeability: mounting flange (SAE, DIN, or cartridge), shaft specification, and port configuration are identical to the original Sauer Danfoss specification. Every unit undergoes 100% simulated duty-cycle testing before shipment, covering full-load pressure cycling, thermal balance verification, and shock-load validation.

Brand Note: The Sauer Danfoss Series 51 hydraulic product line is currently operated by Danfoss Power Solutions. Eaton Vickers, as a hydraulic brand, includes 51-series compatible products in some catalogs. The number “83001272” in the original title was not found in Sauer Danfoss or Eaton Vickers official parts databases; please confirm the specific meaning of this number with your supplier.

Technical Specifications 

51V160-RC8N-F2A1-ANE2-DAA-052AANN-0328-034

• Model: 51V160-RC8N-F2A1-ANE2-DAA-052AANN-0328-034

• Brand Series: Sauer Danfoss / Danfoss Series 51

• Motor Type: Bent-axis variable piston motor, spherical pistons

• Maximum Displacement: 160.9 cm³/rev (9.82 in³/rev)

• Minimum Displacement: 32.2 cm³/rev (1.96 in³/rev)

• Control Ratio: 5:1

• Maximum Working Pressure: 420 bar

• Peak Pressure: 480 bar

• Maximum Speed: 5000 rpm

• Rated Flow: 402 L/min (106 US gal/min)

• Maximum Flow: 515 L/min (136 US gal/min)

• Maximum Corner Power: 644 kW (864 hp)

• Control Type: Proportional control, stepless regulation

• Mounting: SAE 4-bolt flange / DIN flange (optional)

• Mass Moment of Inertia: 0.0234 kgm² (0.5553 lb·ft²)

• Weight: Approximately 56 kg (123 lbs)

• Fluid Compatibility: DIN 51524 Part 2/3 (HLP/HVLP), SAE J183 CD/CE/CF, ATF, STOU, premium turbine oils

51V080-1-RS1NE1B1NNU1NNN047AAG0-0000

• Model: 51V080-1-RS1NE1B1NNU1NNN047AAG0-0000

• Brand Series: Sauer Danfoss / Danfoss Series 51

• Motor Type: Bent-axis variable piston motor, spherical pistons

• Maximum Displacement: 80.7 cm³/rev (4.92 in³/rev)

• Minimum Displacement: 16.1 cm³/rev (0.98 in³/rev)

• Control Ratio: 5:1

• Maximum Working Pressure: 510 bar (series reference)

• Maximum Speed: 7000 rpm (series reference)

• Rated Flow: 250 L/min (66 US gal/min)

• Maximum Flow: 323 L/min (85 US gal/min)

• Maximum Corner Power: 403 kW (540 hp)

• Control Type: RS1 control, proportional regulation

• Mounting: SAE 4-bolt flange

• Mass Moment of Inertia: 0.0071 kgm² (0.1685 lb·ft²)

• Weight: Approximately 32 kg (71 lbs)

• Fluid Compatibility: Same as 51V160 specification

Note: Pressure and speed data for 51V080 are referenced from Sauer Danfoss Series 51 technical manuals and industry public sources. Refer to the OEM datasheet for definitive values.

Key Technical Advantages

① Bent-Axis Spherical Piston Design — High Speed and High Power Density

Series 51 motors employ a bent-axis architecture in which pistons contact the drive plate through spherical ends, replacing the slipper design found in conventional axial piston motors. Spherical pistons are less affected by centrifugal forces at high rotational speeds, enabling maximum speeds of 5000–7000 rpm — significantly higher than typical axial piston motors of equivalent displacement. For direct-drive applications requiring high rotational speeds (travel drives, railway equipment), this characteristic eliminates the need for reduction gearing and simplifies the drivetrain.

② 5:1 Large Control Ratio — Wide-Range Stepless Speed Control

Series 51 motors achieve a displacement control ratio of 5:1 (51V160: 160.9 to 32.2 cm³/rev; 51V080: 80.7 to 16.1 cm³/rev). After starting at maximum displacement for maximum torque, the motor progressively reduces displacement as speed increases, enabling wide-range stepless speed control without altering pump output flow. This characteristic allows smooth transitions between low-speed high-torque and high-speed low-torque operating conditions, ideal for travel-drive systems with varying load demands.

③ Proportional Control and Pressure Compensator — Precise Power Management

The 51V version features proportional control that enables continuous displacement adjustment in combination with a Series 90 pump or other closed-circuit pump. The pressure compensator functions as a stand-alone regulator and operates in both motor and pump modes, ensuring optimal power utilization throughout the motor‘s entire displacement range. This control architecture maintains stable output characteristics during transient conditions such as vehicle acceleration, climbing, and braking.

④ Compact Lightweight Design — Accommodates Constrained Installation Spaces

Despite a displacement of 160.9 cm³/rev, the 51V160 weighs only approximately 56 kg, and the 51V080 approximately 32 kg — power density significantly exceeding equivalent axial piston motors. Series 51 offers SAE, cartridge, and DIN flange configurations, with cartridge motors designed for direct installation into compact planetary drives, further reducing overall drivetrain dimensions.

⑤ Broad Fluid Compatibility — Adaptable to Diverse Operating Environments

Series 51 motors are compatible with mineral oil, biodegradable hydraulic fluids, and fire-resistant fluids. In forestry, mining, and other applications with specific environmental or fire-safety requirements, the motor can be adapted to the appropriate fluid without replacement, reducing system modification complexity.

Application Areas

• Forestry Machinery: Hydrostatic travel drives for Ponsse Ergo/Buffalo forwarders, Timberjack 1010/1210B/1410 forwarders, Valmet 811.4 forwarders

• Agricultural Machinery: Travel drive systems for Claas Lexion 650 and New Holland CR9070 combine harvesters

• Compaction Equipment: Hydrostatic drives for Dynapac CA 2800 and Bomag BW 213 heavy soil compactors

• Construction Machinery: Crawler dozer and railway equipment drive systems

• Mining & Drilling: Drill rotary drives, underground LHD travel systems

• Industrial Transmission: Closed-loop hydraulic drive systems, test stand drives

Expert Maintenance Tips

Pre-Installation Inspection: Verify flatness and cleanliness of the mounting flange mating surface. The interface between spherical pistons and the drive plate is extremely precise; avoid impact or scratching during installation. Spline shaft-to-coupling fit must conform to SAE or DIN standards; avoid interference fits. Tighten mounting bolts in diagonal sequence to specified torque.

First Commissioning: The motor casing must be filled with clean hydraulic oil before initial start-up. Fill through the highest casing port until oil overflows from the level port. Series 51 motors typically start at maximum displacement, producing high instantaneous torque at startup; insufficient casing lubrication causes severe wear on spherical piston-to-drive plate contact surfaces. Closed-loop systems should complete charge pump circuit bleeding before startup.

Fluid Cleanliness and Temperature Control: Maintain system oil cleanliness at NAS 8 (ISO 4406 18/16/13) or better. Oil temperature should remain at least 16°C (30°F) above the pour point of the hydraulic fluid, with maximum temperature not exceeding Series 51 technical manual limits (typically referenced to case drain temperature). Viscosity should remain within the recommended range to ensure volumetric efficiency and bearing life.

Scheduled Inspection: Check casing drain flow and motor displacement control response 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. Also inspect proportional controller response linearity; if displacement regulation exhibits lag or non-linearity, inspect servo spool and pressure compensator operation.

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 spherical piston-to-drive plate contact surfaces. Perform a no-load run-in before returning to service.