The drawing below shows a typical flange mounted PTO clutch/brake assembly. Although we have many designs of flange mounted PTO clutch/brakes (these were first used in the 1970's), there are very few that are still used in production today. These clutches are made so that the field is mounted directly to the engine face. The other components are then slid onto the shaft and kept on by the center bolt. (Most customers have switched to the bearing mounted style because of the ease of installation.)
A flange mounted clutch does not have a field bearing. Although this makes installation more time consuming, there is also no possibility of bearing failure in this area. This means that flange mounted clutches are ideal for installations that would remain engaged for long periods of time. If you believe you have an application that would benefit from this design, please contact us and we will work out the details with you.