GB Series Gearboxes

The GB Series is our most extensive range of high torque planetary gearboxes. GB Series offers a sizeable torque range and an impressive 98% efficiency per reduction stage. The GB Series is available with a wide array of input and output accessories with nominal torque ranges that extend from 88,560 ft-lbs to an impressive 2.2 million ft-lbs.


  • Large torque output - up to 2.2 million ft-lbs of nominal torque
  • 1, 2, 3, 4, 5 or 6 reduction stages available with various ratios
  • Modular design allows increased torque ratings in the same frame size
  • Easy maintenance due to sectional design elements
  • Increased shaft pull-out rating due to one-piece integrated output shaft/primary gear carrier
  • Multiple output shaft configurations include male, female, hex, cylindrical, splined and hollow
  • 98% efficient planetary gears
  • Numerous input configurations, brakes, couplings, high-speed shafts, PTO
  • Smooth and quiet transmission due to gear design profile
  • Stocked in Charlotte, North Carolina

Gearbox Catalog

Maintenance Manual
We are a global company and provide our maintenance manuals in multiple languages. Please scroll through the document until you find the appropriate section.

Gearbox Owners Manual



Every application is unique and has different requirements. Our gearboxes are designed to accommodate a variety of accessories to ensure maximum efficiency and productivity.

Negative Static Multi Disc Brakes
Dinamic Oil designs and produces all of our own wet negative static multi-disc brakes in house. The brakes are optional accessories for our planetary gearboxes and winch drives and offer a wide range of torque ratings. Brakes can also be configured as “dry” brakes, that allows them to function at increased input speeds without overheating, others can accommodate sprag clutches. Each brake is 100% tested to ensure the rated braking torque is verified.

NEMA And IEC Electric Motor Inputs
All of our RE and GB Series Gearboxes come with optional NEMA and IEC Electric Motor Inputs. The frame sizes vary from NEMA 56 to 365 and IEC 71 to IEC 355. Electric Motors can be mounted directly onto gearbox and adapted to inline or bevel configurations.

Foot Supports
All of Dinamic Oil’s RE and GB series of planetary gearboxes come with optional cast or fabricated foot supports. The modular and robust design allows for easy field installation.

Torque Monitoring
Dinamic Oil’s new Torque Monitoring system provides real-time torque feedback from within the gearbox, thus eliminating the uncertainties and errors inherent to pressure-based or external load cell designs. Strategically placed strain gauges inside an intermediate flange offer accurate and repeatable results while still maintaining the same overall dimensions as a standard gearbox.


  • Output Signal: 4-20 mA
  • Direction Sensing: 4-12 mA Clockwise, 12-20 mA Counterclockwise
  • External ‘zeroing’ circuit available
  • IP67 Rating


  • The system can be installed on existing Dinamic Oil gearboxes depending on the size and composition.
  • The output signal can be manipulated to eliminate errors caused by material elasticity or temperature.
  • The output signal is not affected by axial or radial loads subjected to the gearbox output shaft.

Other accessories include:

  • Torque arms
  • Shrink discs
  • Two-speed inputs and disconnects
  • Water cooling jackets

Refer back to this page as we regularly add more accessories to complement our product range.