Hebco Industrial
Any gearbox, any state, any time, and all your questions answered

Amarillo Gear Drives for
Cooling Towers


Amarillo Cooling Tower Drives are specifically designed and manufactured for operation in wet cooling towers. Whether your business runs large diameter axial fans, needs reverse operation for de-icing, has multiple on-offs per day, operates in extreme temperatures, or in environments with 100% humidity, Amarillo has the precise gearbox for to suit your application. And with 35+ years’ experience with Amarillo products, you can rely on our knowledge, support and advice for any fan drive, on any cooling tower – old or new.

Single Reduction Fan Drives

Gearboxes incorporating one reduction ranging from ratios of 2:1 to 9.5:1. Power ranges from 7 HP (5.2 kW) up to 134 HP (100 kW).

Local stock tailored to Australian 4-pole motor speeds

Repair service available for all models at our Melbourne workshop

Meets or exceeds CTI recommendations for bearing and gear life

2.0 Service factor as standard based on the AGMA gear rating system to comply with CTI recommendations

Reducing ratios from 2:1 thru to 9.5:1 reducing 

Thermal rating meets or exceeds the service rating at air temperatures up to 49C

Extensive range of standard optional extras

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Double Reduction Fan Drives

Need higher ratios or have a higher power requirement? Amarillo’s double reduction gearbox is the obvious choice. Reduction ratios range from 7.5:1 to over 20:1.

Local stock tailored to Australian 4-pole motor speeds

Repair and service available for all models at our Melbourne workshop

Meets or exceeds CTI recommendations for cooling tower operation

2.0 Service factor as standard based on the AGMA gear rating system to comply with CTI recommendations

Extensive range of optional extras available

Reducing ratios from 7.5:1 thru to 25:1

Power ratings from 16.4kW to 372.8kW 

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Marley Replacement Drives

Amarillo “A” Series right angle gearboxes are designed to replace or substitute for the Marley® line of gear reducers.

You don’t need to worry about your Marley gear reducer because the Amarillo “A” Series’ critical mounting dimensions are identical to the Marley® gear reducers, making the gearbox replacement process seamless.

Direct bolt in replacement for Marley Geareducer

Ratios within +/- 2% of Marley ratios

Bearing and gear life meets or exceeds Marley ratings

Extended output shafts available to match all common Marley configurations

Exclusive low speed option to keep bearings lubricated in low energy modes with reduced input speeds

Large range of optional extras designed increase service life

All models repaired and services at our Melbourne workshop

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Composite Drive Shafts

Amarillo's composite drive shafts are designed specifically for cooling tower use and custom made per order. Each drive shaft is balanced prior to leaving the factory and tested to 4 times operating torque.

Custom made for each specific installation

Shaft spans up to 6 meters without bearing support

#316 Stainless Steel hubs and hardware

Patented flex disc allows up to 1.5 degrees angular misalignment per shaft end

Composite materials, including carbon fibre, selected specially for each installation

Engineered selection process calculates shaft harmonic frequencies so you can lock those speeds out of your motor controls

UV coating extends service life

Light weight simplifies installation

Up to 90% weight savings compared to full stainless steel drive shafts

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Oil Filtration System

Amarillo's oil filtration system simplifies scheduled maintenance and extends oil life which has the benefit of extending gear drive service life. Designed for cooling towers where gear drives are installed in hard to access locations, this oil filter has a payback period of a little as 6 months.

Save time and money by filtering your gearbox oil without shutting your system down

Extends the life of your oil, reducing costs

Reduce your OH&S compliance obligations. A safer, faster alternative

System can also be used to do oil changes

Oil sample port makes sampling oil a breeze for maximum oil and machine life

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Special build and optional extras

Your industrial applications might not be standard, so talk to us about external modifications that we can add to your gearbox that will help you achieve the outcome you are after. We can specify, install or apply several external modifications or upgrades to your new gearbox.

Oil Level Switches

Oil Pressure Gauges and Switches

Sprag backstops

Temperature Gauges and Switches

Slow speed lubrication upgrades

Upgraded Materials

Custom Paint Specs

Bespoke Testing

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