Parallel Shaft Dimensions

Gear Drive Selection

Ratio
All ratios are reducing and defined as the ratio of input speed to output speed. Nominal reduction ratios shows in Tables I & II are exact within + or - 2%. Exact ratios are shows in Table III.

Ratings
Amarillo Gear Company recommends a minimum service factor of 2.0 for gear drives in cooling tower fan service when driven by electric motors. All ratings in Tables I & II are service ratings and include a 2.0 service factor. Ratings are listed for both 60 and 50 cycle electric motor speeds. Ratings at intermediate speeds may be interpolated from the tables. Contact the factory

Thermal Rating
By designing specifically for dry cooling system and steam condenser service, Amarillo Gear engineers ensured that the thermal ratings equal or exceed the service ratings listed in Tables I & II when the ambient air temperature is 120 degrees F or less. Contact the factory for thermal rating when the air temperature exceeds 120 degrees F.

Selection
The required ratio is established by dividing the input or driver speed by the output or fan speed. Select the ratio from either Table I or II that is the closest to the required ratio. Select the model that has a service rating listed under the required ratio column that is equal to or greater than the power rating of the driver at the input speed. When the gear drives are to be selected using a service factor other than 2.0, multiply the "service rating" from the tables by 2.0 to get the "mechanical rating." The "mechanical rating" is then divided by the appropriate service factor to obtain the new "service rating" at the required conditions.

Direction of Rotation
Normal rotation is both shafts clockwise, when viewed from the top, as shown in the illustration. Occasional use with both shafts rotating counterclockwise is permissible. Special bearing arrangements are used when the primary direction of rotation is counterclockwise, incurring additional cost, and the gear drives should be ordered accordingly.

Limited Warranty
The Amarillo Gear Company Parallel Shaft Gear Drive is guaranteed against defects in workmanship and material for a period of one year after installation when operated under normal service at rated capacity. Within the above stated period, the manufacturer will replace the defective parts returned transportation prepaid. The buyer shall not be entitled to incidental or consequential damages, losses or expenses. The guarantee will not apply to repairs made outside the factory without the consent of the manufacturer or to drives that have been subject to abuse, accident, neglect or improper installation. No warranty is made in regard to bearings, trade accessories, machinery or other articles of merchandise not manufactured by us. This warranty is expressly made in lieu of any warranties otherwise expressed or implied by law.

Parallel Shaft Dimensions

Features

Parallel Shaft Gear Drive Selection