Danfoss 51 Series Motor | 51C080 51V060 51D080 | Bent Axis Variable Motor | 51C080RD3N 51C060-1

Danfoss 51 Series (51C/51V/51D) Variable Bent Axis Piston Motors

Product Overview: The Danfoss 51 Series represents the pinnacle of variable displacement motors in hydrostatic transmissions. Featuring advanced Bent Axis technology, the 51 Series achieves exceptional rotational speeds and a massive displacement range. This versatile series includes 51C (Plug-in Motor), 51V (Standard Flange Motor), and 51D (Heavy-duty Variant). Highlighting core sizes 60cc and 80cc, this page features precision configurations: 51C080RD3N… and 51C060-1-RD1N…. These motors are the definitive choice for rotary drilling rig heads, excavator travel drives, crawler cranes, and heavy-duty forestry machinery.

Key Technical Advantages:

• Elite Displacement Modulation: With a maximum swivel angle of up to 22°, the series supports a wide speed ratio, enabling smooth transitions from high-torque startup to high-speed travel without mechanical gear shifts.

• High-Pressure Reliability: Rated for continuous operation at 450 Bar with peak capabilities at 480 Bar (7000 PSI). Reinforced bent-axis synchronization ensures longevity under shock loads.

• Compact Plug-in Design (51C): The plug-in architecture allows the motor to be recessed into planetary gearboxes (such as the GFT series), significantly reducing the axial length of drive units.

• Precision Control Logic:

  • RD3N / RD1N: High-precision hydraulic displacement control for rapid, shock-free switching.

  • HSA2 / CHE1: Features automatic displacement modulation and pressure feedback to optimize system thermal performance.

• Target Applications: Rotary drilling rigs, concrete pump agitators, road milling machines, and harvester drives.

Detailed Models & Parameters:

• Core Series: Danfoss 51 Series (51C, 51V, 51D).

• Technical Spec Decoding:

  • 51C080RD3NHSA2CHE1NNN040AAE61630: 80cc Plug-in motor, RD3 control logic, HSA2 automatic regulation, minimum displacement set at 40cc.

  • 51C060-1-RD1NB2B3NNU3ADA024AAE6000: 60cc Plug-in motor, Series 1 design, RD1 hydraulic control, minimum displacement set at 24cc.

• Core Performance Specs:

  • Displacements: 60 cc/rev, 80 cc/rev (Full range available).

  • Max Pressure: 480 Bar (7000 PSI).

  • Max Speed: Capable of 4000 – 5000+ RPM (depending on swivel angle).