Product Overview
The 51V160RC8NF2A1ANE2DAA052AANN0328034 is a bent-axis axial piston variable displacement motor built on the Sauer Danfoss/Eaton Series 51 platform, in the 160 cc displacement size. The Series 51 and 51-1 motors are bent axis design units incorporating spherical pistons, primarily designed to be combined with other products in closed circuit systems to transfer and control hydraulic power. The motor delivers a displacement range of 32.2 to 160.9 cc/rev with a 5:1 displacement ratio, a rated pressure of 48 MPa, a maximum pressure of 51 MPa, a maximum speed of 5000 rpm, a maximum corner power of 644 kW (864 hp), and a weight of approximately 56 kg.
The core design philosophy of the 51V series is to achieve maximum power density with minimum displacement. Through the large displacement ratio (5:1) variable mechanism, the motor can start at full displacement to deliver maximum torque, then progressively reduce displacement as speed increases, covering a wide speed range without changing the system’s pump flow. This characteristic makes the 51V series particularly suitable for pairing with Series 90 closed-circuit pumps to form highly efficient hydrostatic drive systems.
This product serves as a form-fit-function replacement for original Sauer Danfoss/Eaton 51V160 series motors, with identical mounting flange dimensions (SAE four-bolt flange or DIN flange), shaft specifications (ANSI or DIN splined shaft), port locations, and control interfaces. Available control options include N1, HZ, E1, E2, E7, F1, F2, T1, T2, TA, TH, EP, EQ, L1, L2, L7, D7, D8, and HS.
Technical Specifications
Model: 51V160RC8NF2A1ANE2DAA052AANN0328034
Series: Sauer Danfoss/Eaton Series 51 (51V)
Motor Type: Bent-axis axial piston variable displacement motor
Design Feature: Spherical pistons, bent-axis configuration
Maximum Displacement (Vg max): 160.9 cc/rev (9.82 in³/rev)
Minimum Displacement (Vg min): 32.2 cc/rev (1.96 in³/rev)
Displacement Ratio: 5:1
Rated Pressure: 48 MPa (480 bar / 6,962 PSI)
Maximum Pressure: 51 MPa (510 bar / 7,397 PSI)
Rated Flow: 402 L/min (106 US gal/min)
Maximum Flow: 515 L/min (136 US gal/min)
Maximum Speed: 5,000 rpm
Rated Speed: 2,200–5,600 rpm
Maximum Corner Power: 644 kW (864 hp)
Mounting: Four-bolt flange, SAE or DIN flange configuration; two-bolt flange cartridge motor configuration
Pipe Connections: Main pressure ports: SAE flange; remaining ports: SAE straight thread O-ring boss
Controls: N1, HZ, E1, E2, E7, F1, F2, T1, T2, TA, TH, EP, EQ, L1, L2, L7, D7, D8, HS
Displacement Limiter: Mechanical minimum and maximum displacement limiters integrated
Shaft Configuration: Splined ANSI or DIN shaft
Weight (approx.): 56 kg (123 lb)
Mass Moment of Inertia: 0.0234 kgm² (0.5553 lb·ft²)
Key Technical Advantages
1. Bent-Axis Spherical Piston Design with High Power Density
The 51V series employs a bent-axis design with spherical-ended pistons that transmit force through spherical contact with the cam (swash plate). Compared to swash plate designs, the bent-axis configuration achieves greater piston stroke and higher load capacity at the same displacement. The large contact area and uniform stress distribution of the spherical pistons effectively reduce wear rates under high-pressure conditions. At the maximum pressure of 51 MPa, this design maintains stable volumetric and mechanical efficiency, with a maximum corner power of 644 kW.
2. 5:1 Displacement Ratio with Wide-Range Speed Control
The 51V160 achieves a displacement ratio of 5:1 (160.9 cc/rev to 32.2 cc/rev), meaning the motor can achieve a 5-fold speed variation through displacement adjustment without changing the system pump flow. The motor starts at full displacement to deliver maximum torque for heavy-load starting conditions; as load decreases, displacement is progressively reduced and speed increased up to 5,000 rpm. This characteristic makes the 51V series particularly suitable for pairing with Series 90 closed-circuit pumps in continuously variable hydrostatic drive systems.
3. Flexible Mounting Configurations and Modular Control Options
The 51V series offers three mounting configurations: SAE four-bolt flange, DIN flange, and two-bolt flange cartridge motor. Cartridge motors are designed for direct installation into compact planetary drives, eliminating the need for couplings and mounting brackets, significantly reducing system space requirements. Control options include N1, HZ, E1, E2, E7, F1, F2, T1, T2, TA, TH, EP, EQ, L1, L2, L7, D7, D8, and HS, supporting manual, hydraulic pilot, and electro-proportional control to match different machine speed control precision requirements.
4. Pressure Compensator for Optimal Power Utilization Across Full Displacement Range
The 51V series can be equipped with an optional pressure compensator featuring a low pressure rise (short ramp) characteristic, ensuring optimal power utilization across the entire displacement range of the motor. The pressure compensator is also available as a standalone regulator, simplifying hydraulic circuit design. Combined with the integrated mechanical minimum and maximum displacement limiters, users can precisely set the motor’s displacement operating range to prevent system overload or overspeed.
Application Areas
Forestry Machinery: Ponsse Ergo/Buffalo harvesters, Timberjack 1010/1210B/1410 forwarders, Valmet 811.4 forwarder hydrostatic drive systems
Agricultural Machinery: Claas Lexion 650 combine harvester travel drives, New Holland CR9070 combine drive systems
Compaction Equipment: Dynapac CA 2800 soil compactors, Bomag BW 213 rollers
Construction Machinery: Wheel loaders, telescopic handlers, skid steer loaders
Material Handling: Heavy-duty forklifts, reach stackers, container handling equipment
Industrial Drives: Closed-circuit hydrostatic transmission systems, winch drives
Expert Maintenance Tips
Shaft Alignment Requirements: When installing a splined shaft, ensure the coaxiality deviation between the motor shaft and the drive end spline does not exceed 0.05 mm. The 51V series bent-axis motor’s cylinder block is connected to the drive shaft through a spherical hinge; excessive radial forces will accelerate spherical pair wear and degrade displacement control precision.
Closed-Loop Flushing Requirements: The 51V series motor typically operates in closed-circuit systems, and case temperature should be maintained below 80°C. Inspect case drain leakage every 200 operating hours; normal leakage should remain below 5 L/min. A sudden increase indicates potential wear on the piston-to-bore clearance or the distribution plate.
Hydraulic Fluid Cleanliness: The 51V series motor features precision clearances in the piston and distribution pairs. Maintain hydraulic fluid cleanliness at ISO 18/15 or NAS Level 9 or better. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually, with filter element filtration accuracy no less than 10 μm.
Control Mechanism Maintenance: Periodically inspect the servo piston and pilot valve spool for smooth operation. Test displacement adjustment response time every 500 operating hours; the switching time from minimum to maximum displacement should be within 0.5–1.5 seconds. If response is sluggish, check pilot circuit pressure and valve spool wear.
Restart After Extended Storage: For motors stored over 6 months, manually rotate the shaft 2–3 revolutions to confirm free rotation, then run at low pressure (10 MPa) under no load for 10 minutes, confirming normal case temperature and leakage before gradually applying load.
