STF – STFD Series – Dual Speed Hydraulic Motor
Unlock unparalleled operational flexibility with the STF STFD Series Dual-Speed Hydraulic Motors. Available through Thm Hydraulics, the STFD series is a high-performance evolution of the renowned STFC line. This motor inherits the industry-leading hydrostatic balance structure—ensuring extreme mechanical efficiency and high starting torque—while adding the ability to switch displacements on the fly. Whether your machinery requires massive torque for initial movement or high speed for travel, the STFD series allows you to toggle between performance profiles while the motor is running. This makes it the ultimate solution for specialized working conditions that demand a wide range of speed and power outputs.
Core Technical Specifications;-
- Component Architecture: Dual-Speed Low Speed High Torque (LSHT) Motor
- Model Variations: STFD-100, 125, 200, 270, and 325
- Maximum Operating Pressure: Up to 275 bar
- Rated Torque Range: 18 to 763 N.m/MPa
- Switching Options: Electromagnetic (Remote), Manual, or Automatic
Key Features & Engineering Advantages:-
- On-the-Fly Displacement Switching: Features a specialized control valve mounted directly on the motor, allowing the operator to switch between high-torque/low-speed and low-torque/high-speed modes without stopping the machinery.
- Proven Hydrostatic Balance: Inherits the advanced internal architecture of the STFC series, which minimizes friction between the con-rod and eccentric sets. This results in an exceptionally high starting torque and superior volumetric efficiency.
- Versatile Control Interfaces: Customize your operation with three distinct switching methods: Electromagnetic for seamless remote cabin control, Manual for rugged mechanical reliability, or Automatic for load-sensing efficiency.
- Wide Displacement Range: Offers a comprehensive selection of displacement options, giving engineers the freedom to tune the motor's performance to the specific load and speed requirements of the host vehicle or machine.
- Stable Low-Speed Performance: Despite its dual-speed capability, the motor maintains rock-solid stability at very low RPMs, ensuring precise control during heavy lifting or high-load positioning tasks.
Ideal Industry Applications:-
The ability to switch speeds under load makes the STF STFD Dual-Speed Motor the premier choice for:
- Construction & Earthmoving: Driving the tracks or wheels of machinery that requires high torque for digging and high speed for site transit.
- Marine Winches & Hoists: Providing the power to lift heavy loads at low speed and the efficiency to reel in empty cables rapidly.
- Mobile Material Handling: Powering truck-mounted cranes and loaders that need to adapt to varying load weights and operational speeds.
- Specialized Mining Equipment: Serving as a robust rotational drive for drilling rigs and underground transport vehicles that operate in changing terrain conditions.
Why Choose the STF STFD Series?
- Eliminate Operational Downtime: Stop pausing your work to change gears; the STFD allows you to adapt to your load requirements instantly while the motor is in motion.
- High-Efficiency "Inheritance": Because it is built on the STFC chassis, you get the same legendary durability and 90% starting efficiency with the added benefit of dual-speed flexibility.
- Compact Integration: The integrated control valve simplifies your hydraulic plumbing, reducing the number of external valves and hoses required in your system.
