AT Rotation Drives

Perfection Gear

The robust design of the AT series makes it an ideal solution in traditional slewing bearing and drive applications. Available as standard products with short lead time or customized to your exact requirements.

Perfection Gear’s AT Series Worm Gear Speed Reducers are hydraulically driven swing drives. These quality made products are commonly used as a rotation drive for booms, but could be used in any application where speed reduction is required.

Key Features

  • Withstands High Shock Loads
  • Optional Electric Motor Driven Swing Drives
  • Solid Bronze Gears
  • Hardened Steel Worm
  • Tapered Roller Bearing
  • Optional Crowned Pinion Teeth


AT Rotation Swing Drive – brochure

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Technical Overview

Size 2.63″ to 5.17″ Center Distance
Ratio 15:1 to 50:1 or
Per Customer Specification
Output Torque
8,000 to 45,000 Capacity
22,000 to 150,000 Output Yield
Output Pinion/Shaft Per Customer Specification
Input Option SAE “A” Mount;
2 Bolt, Keyed or Splined
Other Specifications Eccentric Ring to
Customer Specification
Applications List Man-lifts
Utility Trucks
Boom Trucks
Truck-Mounted Cranes
Tree-Trimming Vehicles
Fire & Rescue Vehicles
Service Trucks