Geareducer® - Single Reduction
OVERVIEW The reliability of the Geareducer comes from more than 100,000 units of experience, and from Marley's attention to exacting quality standards of design and manufacturing. Today, every Marley Geareducer is tested under load at our factory. Then, it's inspected and adjusted before shipment.


For over 80 years, Marley has been making the most reliable geared speed reducers—designed specifically for cooling tower service.

Marley has always known that outstanding Geareducer engineering is only as good as the lubricant that protects it. That’s why we took the next step and filled every System 5 Geareducer with Marley Gearlube™ lubricant.

In addition, Marley has made several improvements in the System 5 Geareducer to take advantage of the extraordinary lubricating properties of Gearlube. The new 1800, 2000, 2200, 2400 and 2800 Geareducer models will utilize a long-life lip-type oil seal at input shaft for extended service life.

We’ve equipped it with a magnet in the sump to trap metal particles generated during initial break-in period.


Genuine Marley OEM parts are precision-engineered to provide you with a reliable product. While other suppliers may offer parts at an initial savings, you risk lowering performance — and losing FM and CTI ratings. Marley OEM parts provide the durability you can trust because we design and manufacture them exclusively for cooling towers.

With plant operation relying on your cooling tower performance, it’s important to select the parts that are among the highest quality available — Marley OEM parts.

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Marley® Cooling Tower Gear Drives Vs. Belt Drives
  • Outstanding durability

  • Designed specifically for cooling tower duty

  • 5 year oil change interval

  • Minimum L10A service life of 100,000 hours on both input and output shafts

  • Long-life lip-type oil seal at input shaft

  • Output shaft sealed with a maintenance-free labyrinth ring

  • Timken tapered roller bearings


Marley Cooling Tower Parts