SW Rotation Drives w/Bearings

Perfection Gear


Industry leading Swing Drive design combines key features of standard Slewing Bearing and Drive systems into a unique “all-in-one-package”.

The SW swing drive incorporates the benefits of AT Style worm gear drives with an integral slewing ring. Its design eliminates the common “stick-slip” phenomenon often associated with traditional worm-on-slewing-ring systems. The SW system absorbs higher shock loads and overturning moments compared to traditional worm gear drives.

The patented SW all-in-one package is the best solution for aerial truck applications. It features pre-set backlash, a hydraulically driven input, and minimizes customer interface machining. SW swing drives are readily available in four standard sizes with other sizes available upon request. All SW products can be modified to customer specifications.

Key Features

  • No Stick Slip
  • Requires Two Flat Surfaces for Mounting
  • One Source for Complete System
  • No Gearbox to Mount on Opposite Side of Mounting Plate
  • Modular Construction for Simple Installation
  • Pinion Supported on Both Sides
  • Hardened Steel Worm, Tapered Roller Bearing and Crowned Pinion Teeth
  • High Strength Aluminum Bronze Gear




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Technical Overview

Size 10.03″ to 15.23″ Center Distance
(Primary Worm to Slewing Ring)
Ratio 138:1 to 229:1
Output Torque
22,500 to 92,000 Capacity
Slewing Ring Bearing (Outside Diameter) 12″ to 20″ Standard
Additional Sizes Per Customer Specification
Overturning Moment (ft-lbs) 20,000 to 90,000 Continuous
Input Option SAE “A” Mount;
2 Bolt, Keyed or Splined
or Per Customer Specification
Other Specifications Worm Gear Primary Gearbox with Electric Motor Input
Applications List Cranes and Man-Lifts, or any application where speed reduction is required.