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Engine Driven Power Take Offs: Applications and Types

In an industrial capacity, the need for heavy-duty components that can handle transmitting the power required for machinery to operate translates into one specific part: the power take-off. The PTO is an essential element that transfers an engine’s power to another mechanical device. However, there isn’t just a single type of engine driven PTO, and each unit is uniquely suited for various, specific industrial applications.

Mechanical PTO
A mechanical PTO is a traditional power take off compared to a hydraulic and pneumatic power take off. It is equipped with a lever actuated clutch that can be engaged manually and consists of bearings mounted in a cast housing. Because of its design, this power take off clutch combo minimizes downtime and reduces the need for maintenance. It is mounted to the flywheel of the engine and is suited for in-line and side load applications.

Automotive PTO
Not specifically design for automotive applications, this type of PTO is named for its use on engines similar to what you might find in a pickup truck. This style makes use of a spring-loaded clutch assembly and is typically easier to engage and disengage than the over center clutch models. Mounted to the flywheel, commonly referred to as a “flat-faced flywheel,” the automotive PTO eliminates the pilot bearing and has easy external adjustments to reduce maintenance time and cost. Again, this type of PTO is suited for in-line or side load applications.

Type 1 and Type 2 PTO
The Type 1 PTO utilizes a straddle bearing design with large spherical roller bearings and the sheave mounts in between them. The Type 1 is one of the highest capacity products available plus can be mechanically, hydraulically, or pneumatically actuated. The Type 2 is a hydraulic power take off with either hydraulic or pneumatic actuation. The Type 2 design eliminates clutch adjustment throughout its wear life.

The selection process of the right PTO will involve thinking about several service factors including horsepower, the torque needed, and side load limit to name a few. The application influences that decision also since they have widely varied uses such as wood chippers, hay balers, irrigation pumps, road planers and more. The Power Take-offs mentioned are some of the more standard methods of transmitting power and many more styles are available. If the application has some unique operation functions a new concept may be in order. Bottom line is you need a reliable and rugged performer and it starts with the application requirements.

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