Amarillo Gear Company LLC

- Model A Series - Right Angle Gear Drives For Cooling Towers


The 'A' Series right angle gear drives for cooling towers from AMARILLO GEAR are designed as direct replacements for the Marley® Cooling Tower line of right angle drives. Since there are no differences in the critical mounting dimensions, the 'A' Series will make gear drive replacements easy. Gear housing foot patterns are identical, eliminating expensive tower gear drive support modifications. The input shaft diameters and keyways are the same, so existing couplings and drive shafts do not have to be replaced. All service ports are also easily accessible. Reduction ratios are within ± 2% of the Marley® reduction ratios, eliminating the need to make costly fan pitch adjustments.

And as always, each AMARILLO GEAR 'A' Series is designed and manufactured to the exacting quality you have come to expect and rely on. AMARILLO GEAR has been designing and manufacturing spiral bevel right angle gear drives since 1934, and the commitment to excellence continues today. One of many examples of this commitment to excellence is the availability of complete noise and vibration testing performed at up to 500 horsepower loading. Design features and ratings are in accordance with, or exceed, the minimum requirements of AGMA (American Gear Manufacturers Association) and CTI (Cooling Technology Institute) standards.

  • Housing and Castings
    Gear housing and castings are designed to ensure lhat critical dimensions correspond to those of the counterpart Marley35 model. Castings are rigidly designed and constructed to absorb internal and external loads with minimum deflection. Gear case and cover are manufactured to assure permanent alignment of bearings and gears under load. The sloped floor of the gear case adds rigidity and permits complete oil drainage. All casting materials are gray cast iron for effective damping of noise and vibration. All mating castings are sealed using 'formed-in-place' gasket material that eliminates 'weeping' associated with fiber-type gaskets.
  • Spiral Bevel Gears
    Designed and manufactured by AMARILLO GEAR for fan drive service, all spiral bevel gears are precision machined from high grade alloy steel, case hardened and lapped in pairs, allowing for quite and efficient operation.
  • Helical Gears
    Helical gears are designed specifically for fan drive service and are precision machined from high grade alloy steel, case hardened and precision ground to provide low-noise, low vibration operation.
  • Bearings
    Amarillo Gear is an industry leader with L10a bearing life exceeding 100,000 hours on all bearings. Input and intermediate bearings provide double the service life specified in AGMA and CTI standards, resulting in lower maintenance costs. The fan shaft bearings are designed to carry all loads imposed by the fan while maintaining this outstanding bearing life. Only trusted name brand bearings such as Timken and SKF are installed in Amarillo fan drives.
  • Quiet Operation
    Quiet operation of the Amarillo Fan Drives is achived through careful design and controlled manufacturing methods of components. Our engineers understand all of the many parameters that affect gear noise and have applied the latest research to the design and manufacture of all components. Parameters that reduce gear noise are controlled during design, manufacturing and assembly to guarantee quiet operation. Rigid shafts and permanently aligned housings guarantee alignments of gears under load are maintained. Test results collected in our state-of-the-art test facility proves thar our sound levels are the lowest available in the industry.
  • Shafting
    All shafting is made from high alloy, fatigue resistant steel. Positioning of input and output shafts maintain the same dimensional locations as the corresponding Marley gear drive. Diameter and keyway of the input shaft remains unchanged. The output shaft is available in both the standard 1/2' per foot taper and special order dimensions. Note that the table entitled 'Tapered Output Shaft Information' should be referenced to assure correct output dimensions before any order is placed. Surfaces for gears, bearings, and input coupling are precision machined.
  • Lubrication
    Oversize slinger on the input shaft provides adequate lubrication in either direction or at half speed operation. Continuous circulation of oil to all bearings is assured by location of channels and baffles. A permanently mounted oil sight glass is provided on all double reduction units to provide direct visual determination of oil level. A Series drives ship with the first fill of operating mineral oil installed. Synthetic oil is also available as an option. Synthetic lubricants offer advantages of extended service life, a broader operational temperature range, reduced friction, and the ability to maintain a higher film strength which can extend the service life of the gear drive.
  • Service Openings
    Ports for oil fill, oil drain, inspection, and venting are easily accessible.
  • Shaft Seals
    Both the input and output shaft openings have 2 spring-loaded, single-lipped type seals to keep outside contamination from entering the gearbox. Plus, the output shaft has a labyrinth-type plate directly mounted to the shaft to triple protect the gearbox from contamination that might try to enter due to the natural effect of gravitation.
  • Optional Features
    Special output shaft dimensions, backstops (anti-windmilling), oil level switch, oil heaters and thermostats, oil temperature switches, spot-face/drill and tap for vibration transducers, 'low speed' option for single reduction gearboxes when motor input speeds drop below 450 rpm and other accessory items are available on special order.

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