CYCLO Drive Gearmotor_Horizontal_Foot Mount_Integral Motor
CYCLO Drive Gearmotor_Vertical_V Flange_Integral Motor
CYCLO Drive Gearmotor_Foot Mount_Integral Motor
CYCLO Drive Gearmotor_Horizontal_Foot Mount_Integral Motor
CYCLO Drive Gearmotor_Vertical_V Flange_Integral Motor
CYCLO Drive Gearmotor_Foot Mount_Integral Motor

Cyclo® 6000 Gearmotor

Our best-selling gearmotor with high strength and reliability, thanks to its unique Cyclo® mechanism.

  • With its long history and delivery record, it has become synonymous with the term speed reducer.
  • Unique Cyclo® mechanism results in high durability and extended operating life.
  • Wide variety of products available that take advantage of this technology.
  • Select the best product to meet your needs from a wide range of capacities and reduction ratios.
Output Shaft Solid shaft
Output Shaft Direction(s) Any Mounting Direction (horizontal, vertical downward, vertical upward)
Mounting Style Foot Mount, Flange Mount, Case Mount
Frame Size 56 sizes (Output stages)
Reduction Ratio 2.5:1 - 658503:1
Capacity 1/8 to 175HP (0.1 kW - 132 kW)
Motor Types Three phase, premium efficiency, high efficiency, for inverters, outdoors, increased safety, flameproof, compatible with global standards, hollow input
Shockload capacity. The highest in the industry.
Warranty on all Cyclo Products.
Available in standard offerings. Larger ratios available upon request.

Product Features

Avoid Catastrophic Failure

The cycloidal disc design allows the reduction components to operate in a smooth, rolling manner, preventing tooth breakage typical in conventional gearing, and resulting in a durable product with a long life.

Wide Capacity Range

Choose the size and modifications that best fit your needs. A wide range of HP ratings up to 200HP, reduction ratios up to 658,503:1, and dozens of application and industry specific modifications, ensure your operation avoids unexpected downtime.

Industry Leading Service Factors

Due to the Cyclo design, service factors out pace normal AGMA recommended service factors by nearly 25%. This allows you to downsize when selecting a Cyclo, while still maintaining the same ratings and service factors you are accustomed to with conventional gear reducers.

Maintenance Free Options

Rolling elements result in less friction and less heat. Subsequently, this allows us to utilize grease lubrication in an effort to provide you with a nearly maintenance free solution. Grease lubrication comes standard in sizes 6060 to 6125, and is optional in sizes 6130 and above.

Bearing Grade Steel

Unlike conventional in-line gear reducers utilizing helical or planetary gearing, all of the Cyclo's reduction components are made of high quality 52/100 bearing-grade steel.

Compact and Torque Dense

With single reduction ratios up to 121:1, we can offer single stage reducers where others must move to two or three stages. This allows for a compact offering, saving you money and space, as well as a efficiency gains compared to multi-stage reducers.

Break-Resistant Gearing

Unlike a regular involute tooth-gear, the "cycloidal disc," which is the gear for the Cyclo® Reducer, features a distinctively smooth curve.
A unique circular-arc tooth profile is also used for the internal gear. The smooth rolling contact that prevents tooth breakage results in a durable gearbox with a long service life. (Some low reduction ratio models use helical gears and planetary gears.)

Catalog / Instruction Manuals

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Do you have questions about the Cyclo Drive? Below are some of our most commonly asked questions or you can view our Support area under Knowledge for more frequently asked questions and answers.

In general terms, the speeds are 1750 and 1165 RPM. The selection tables in our catalog are based on 1750, 1165, 870, 580, and 50 RPM. When non-standard input speeds are used, the kilowatt (or horsepower) and torque ratings also vary.

This is because Cyclo has a high teeth engagement rate. Since the Cyclo gearing has two-thirds of its reduction components in contact at all time, it can withstand higher shock loads and is more stable than traditional involute gearing.

The Cyclo speed reducer, by virtue of its smooth, almost frictionless operation (unlike traditional helical gears), has a thermal rating that far exceeds its mechanical capacity, and all but eliminates the conventional limitions due to heat.

To select the proper reducer for your application, you need to know: Application: type of driven machine 
Hours of operation per day 
Motor horsepower (HP) and speed (RPM) 
Mounting position 
Ambient environment (altitude, dusty, chemical, explosive, water) 
Ambient temperature and humidity 
You must also note any special environment factors or operational requirements. This information will be important in determining your application's service factor.

Models having an "N" after the nomenclature symbol "C (Cyclo)," are universal mounting models that can be mounted in any direction . However, when there is an "H (horizontal)," "V (vertical with slow speed shaft downward)" or "W (vertical type with slow speed shaft upward)," after the "C," the unit cannot be mounted in any direction other than the one specified.

Generally, Cyclo® Drives allow for input at 3600r/min for up to 3HP, 6:1 to 87:1 ratio. For more than 3HP, it varies depending on frame size and reduction ratio. Many Cyclo models can accept input speeds of up to 3,600 RPM. However, the maximum allowable input speed is dependent upon the model number and the reduction ratio.

Theoretically any combination is available by multiplying single reduction ratios: 6, 8, 11, 13, 15, 17, 21, 25, 29, 35, 43, 51, 59, 71, 87, and 119:1.

Mounting bolts are not included. Refer to the maintenance manual for mounting bolt specifications.

The standard ratings for Cyclo are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0). By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for the severe operating conditions.

Cyclo frame size 606 to 612# are called “MF: Maintenance Free.” Grease replenishment is not required for normal operating conditions, and grease fittings are not utilized. Sumitomo recommends overhaul and grease change at 20,000 hours or 4-5 years. However, when the Cyclo uses special grease for high or low ambient temperature and grease fittings are installed, then grease replenishment and grease changes are required according to the appropriate factory schedule.

Cyclo® is a type of internal planetary gear. The planetary gear has cycloidal-shaped teeth. All torque-transmitting parts roll, not grind. Unlike the normal involute teeth with limited contact points, a Cyclo has two-thirds of its reduction components in contact at all times. Multiple teeth share the load, so therefore the Cyclo® is not susceptible to tooth breakage.

Selection should be made based on required Service factor. The Service Factor value depends on the load characteristics and operation time for the customer’s application.

In general, reducers and gearmotors are rated for specific conditions and operating requirements of the application by the use of AGMA-defined Service Factors.  There are three AGMA load classifications for reducers: uniform (U), moderate shock (M) and heavy shock (H), and three AGMA load classifications for gearmotors: III, and III. Refer to our catalog for a list of AGMA load classifications. These Service Factors are used in the product selection process to adjust for the specific conditions and operating requirements of your application.

Emergency After-Hours Support


Sumitomo’s Product Support offers scheduled repair services as a one-stop-shop for all your related gearbox needs. For emergency repairs, we offer repair services 24 hours a day, 7 days a week.

Cyclo and Spur Gear

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