TR-800 JOHN DEERE CLUTCH

The TR-800 clutch has rollers mounted to the flyweights. The ramps are fixed to the movable sheave. Flyweight mas can be altered without affecting the shifting profile.
   This is a new clutch which was introduced to consumers for the first time on the 1982 model John Deere Liquifire, which had logged thousands of miles in the field before it was ever installed in a consumer model.  The TR-800 clutch testing program began in earnest during the 1981-82 winter season.
   Some of the early proto-type John Deere TR-800 clutches were plagued with an overheating problem which caused blown belts, however the problem was solved by John Deere.  First by running it open faced like Comet, but the results were unsatisfactory.
To solve the problem, what they came up with was a combination of a rib with a hole behind it that would move the air like a fan and thereby cooling the moving sheave and the belt.  The cooling veins actually created a low pressure area.