Before making adjustments to a pull-type clutch, review the following conditions to ensure optimum clutch performance:
1. Clutch brake squeeze (increased resistance) begins at the point the clutch brake is initially engaged. Optimum clutch brake squeeze begins
1 inch from the end of the pedal stroke or above the floor board (Figure 14–30). Adjustment is made by shortening or lengthening the external linkage rod.
2. Optimum free pedal is 1½ to 2 inches. This adjustment is made internally in the clutch, never with the linkage.
3. Release travel is the total distance the release bearing moves during a full clutch pedal stroke. A typical release travel distance of ½ to 9⁄16 inch is required to ensure that the release bearing releases sufficiently to allow the friction discs to turn freely with no clutch drag. Optimum free travel is 1⁄8 inch. These adjustments are accomplished by using the adjusting ring.
4. Internal adjustment of the adjusting ring should be made before attempting linkage adjustments.
5. Internal clutch adjustments should be made with the clutch pedal down (clutch released position).
6. Turning the adjusting ring clockwise moves the release bearing toward the transmission. Turning the adjusting ring counterclockwise moves the release bearing toward the engine.
7. Linkage adjustment on a pull-type clutch should only be made:
• At initial dealer preparation to set total pedal stroke and yoke throw.
• To compensate for linkage or clutch brake wear.
• When worn or damaged linkage components are replaced.