51V110-1-AD3NTHC2NNX1NNN Danfoss Bent Axis Motor 109.9cc

Product Overview

The 51V110-1-AD3NTHC2NNX1NNN053AAE60031 is a medium-displacement bent-axis axial piston variable motor from the Danfoss Power Solutions (formerly Sauer Danfoss) Series 51, 51V110 frame size. The motor employs a bent-axis design with spherical pistons, primarily intended for combination with other products in closed-loop systems to transmit and control hydraulic power. The motor offers a maximum displacement of 109.9 cm³/rev (6.71 in³/rev), minimum displacement of 22 cm³/rev (1.34 in³/rev), a 5:1 control ratio, rated flow of 308 L/min, maximum flow of 396 L/min, rated pressure of 480 bar (48 MPa), peak pressure of 510 bar (51 MPa), and maximum speed up to 7000 rpm. The model code decodes as: “51V110” = Series 51 variable motor 110 displacement frame, “1” = design revision, “AD3NTHC2NNX1NNN” = control, mounting, shaft, and port configuration code, “053AAE60031” = factory serial and custom code.

Series 51 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 pressure compensator can also be used as a stand-alone regulator and functions when the motor is operating in motor and pump modes, ensuring optimal power utilization throughout the motor‘s entire displacement range. The motor features a compact, lightweight design and is available in SAE, cartridge, and DIN flange configurations, with cartridge motors designed for direct installation into compact planetary drives, further reducing overall drivetrain dimensions.

The motor offers complete interchangeability: mounting flange (SAE 4-bolt or DIN flange), splined shaft, and port configuration are identical to the original Sauer Danfoss specification. Every unit undergoes 100% simulated duty-cycle testing before shipment.

Brand Note: Sauer Danfoss was formed in 2000 through the merger of Sauer-Sundstrand and Danfoss Fluid Power, fully acquired by Danfoss A/S in 2013, and officially renamed Danfoss in September of that year. The Series 51 hydraulic product line is currently operated by Danfoss Power Solutions. Series 51 includes 51V (variable motors), 51D (dual displacement motors), and 51C (fixed displacement motors) types, with displacements from 60 to 250 cm³/rev.

Technical Specifications 

51V110-1-AD3NTHC2NNX1NNN053AAE60031 (Primary Model)

• Model: 51V110-1-AD3NTHC2NNX1NNN053AAE60031

• Brand Series: Danfoss / Sauer Danfoss Series 51 / 51V

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

• Maximum Displacement Vg max: 109.9 cm³/rev (6.71 in³/rev)

• Minimum Displacement Vg min: 22 cm³/rev (1.34 in³/rev)

• Control Ratio: 5:1

• Rated Pressure: 480 bar (48 MPa)

• Peak Pressure: 510 bar (51 MPa)

• Maximum Speed: 7000 rpm

• Rated Speed: 2200–5600 rpm

• Rated Flow: 308 L/min (81 US gal/min)

• Maximum Flow: 396 L/min (105 US gal/min)

• Maximum Corner Power: 492 kW (660 hp)

• Rotary Group Inertia: 0.0128 kg·m² (0.3037 lb·ft²)

• Control Type: Proportional control, stepless regulation (AD control code)

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

• Port Connections: Main pressure ports: SAE flange; remaining ports: SAE straight thread O-ring boss

• Weight: Approximately 44 kg (97 lbs)

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

Note: Parameters are compiled from the Sauer Danfoss Series 51 technical data table and Danfoss Series 51 official technical documentation.

Series 51 Other Displacement Sizes (Series Reference)

• 51V060: Max displacement 60.0 cm³/rev (3.66 in³/rev), min displacement 12.0 cm³/rev, rated flow 216 L/min, max flow 264 L/min, max corner power 336 kW, weight approx. 28 kg

• 51V080: Max displacement 80.7 cm³/rev (4.92 in³/rev), min displacement 16.1 cm³/rev, rated flow 250 L/min, max flow 323 L/min, max corner power 403 kW, weight approx. 32 kg

• 51V110: Max displacement 109.9 cm³/rev (6.71 in³/rev), min displacement 22.0 cm³/rev, rated flow 308 L/min, max flow 396 L/min, max corner power 492 kW, weight approx. 44 kg

• 51V160: Max displacement 160.9 cm³/rev (9.82 in³/rev), min displacement 32.2 cm³/rev, rated flow 402 L/min, max flow 515 L/min, max corner power 644 kW, weight approx. 56 kg

• 51V250: Max displacement 250.0 cm³/rev (15.26 in³/rev), min displacement 50.0 cm³/rev, rated flow 550 L/min, max flow 675 L/min, max corner power 850 kW, weight approx. 86 kg

51D Dual Displacement Variant Frame (Series Reference)

• 51D060, 51D080, 51D110, 51D160, 51D250: Dual displacement design for travel drive applications requiring speed switching

• Core hydraulic parameters consistent with corresponding 51V specifications

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 up to 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. The 51V110 achieves a maximum corner power of 492 kW, offering power density significantly superior to equivalent axial piston motors.

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

Series 51 motors achieve a displacement control ratio of 5:1 (51V110: 109.9 to 22.0 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 51V110 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. The pressure compensator option features a low pressure rise (short ramp) to ensure optimal power utilization throughout the entire displacement range of the motor.

④ Compact Lightweight Design — Accommodates Constrained Installation Spaces

Despite a displacement of 109.9 cm³/rev, the 51V110 weighs only approximately 44 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. 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.