Product Overview
The FA77 with 3.0kW motor stands as the definitive mid-heavy duty drive in the SEW parallel shaft lineup. Unlike right-angle gearboxes that protrude into walkways, the FA77 sits flush against the machinery, making it ideal for agitators, heavy conveyors, and multi-stage processing lines.
The hollow shaft output is the core advantage of this model; it allows the gearbox to be mounted directly onto the driven machine shaft. This direct-drive approach reduces mechanical backlash, lowers maintenance requirements by removing external transmission components, and ensures a more rigid connection for high-load cycles.
Technical Parameters Table
| Feature | Specification Details |
| Output Speed (50Hz) | 5.2 – 348 RPM |
| Bore Diameter | 50 mm (Standard) |
| Service Factor ($f_B$) | 1.0 – 3.5 (Application dependent) |
| Housing Construction | Torsion-resistant gray cast iron (GG25) |
| Efficiency Class | IE3 Premium Efficiency |
| Protection Rating | IP55 Standard / IP66 Optional |
FA77 Unique Performance Features
- Symmetry-Based Internal Housing: The FA77 features a perfectly balanced internal casting that ensures even oil distribution across all three gear stages, even when mounted in vertical or awkward orientations.
- High-Stiffness Gear Meshing: The helical gear teeth are precision-ground with a specific surface displacement that minimizes axial thrust. This results in an exceptionally quiet operation even at the upper limits of its 1,500 Nm torque rating.
- Dual-Chamber Oil Protection: This model employs an advanced sealing system designed to prevent internal lubricant cross-contamination, which is particularly vital in processing environments with high ambient temperature fluctuations.
Installation Flexibility & Shaft Protection
One of the most praised features of the FA77 is its Mounting Adaptability.
- Torque Arm Integration: The housing is pre-machined to accept a rubber-buffered torque arm. This accessory is critical for shaft-mounted installations as it absorbs the reaction torque during high-load startups, protecting your machine's primary shaft from fatigue.
- Shrink Disc Compatibility: For environments prone to corrosion (like wastewater or chemical plants), the FA77 can be fitted with a shrink disc. This provides a friction-based, moisture-tight seal between the gearbox and the machine shaft, preventing the "seizing" that often occurs with traditional keyed shafts.
Related Model Comparison (FA-Series)
| Model | Max Torque (Nm) | Power Range (kW) | Drive Type |
| FA67 | 820 | 1.1 – 2.2 | Medium Duty |
| FA77 | 1500 | 1.5 – 4.0 | Process Heavy Duty |
| FA87 | 3000 | 2.2 – 7.5 | Primary Material Handling |
Primary Application Industries
- Agitators & Mixers: Direct shaft mounting for chemical or food-grade mixing tanks.
- Logistics: Driving high-capacity baggage handling or pallet conveyor systems.
- Water Treatment: Ideal for sludge scrapers and thickener drives.
- Material Handling: Powering heavy-duty screw conveyors and incline belts.
FAQ
Q: Can the FA77 be used with a Frequency Inverter?
A: Yes. The 3.0kW motor is fully inverter-duty rated. For continuous operation at low frequencies (below 25Hz), we recommend adding a forced-cooling fan to maintain thermal integrity.
Q: What is the advantage of the FA77 hollow shaft over a solid shaft?
A: It saves significant space and cost. You don't need a coupling, a belt, or a foundation plate. The gearbox literally "hangs" on your machine's shaft, making alignment 100% automatic.
Q: Is the IE3 motor mandatory?
A: For most industrial regions (EU, USA, China), IE3 is the minimum efficiency standard for 3.0kW motors. It ensures lower energy consumption and reduced heat generation, which extends the life of the gearbox seals.
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